http://git-wip-us.apache.org/repos/asf/hbase-site/blob/a5c4dca3/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AsyncFSWAL.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AsyncFSWAL.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AsyncFSWAL.html index 1e0d2de..95a9f97 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AsyncFSWAL.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AsyncFSWAL.html @@ -27,715 +27,733 @@ <span class="sourceLineNo">019</span><a name="line.19"></a> <span class="sourceLineNo">020</span>import static org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutputHelper.shouldRetryCreate;<a name="line.20"></a> <span class="sourceLineNo">021</span><a name="line.21"></a> -<span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a> -<span class="sourceLineNo">023</span>import java.io.InterruptedIOException;<a name="line.23"></a> -<span class="sourceLineNo">024</span>import java.lang.reflect.Field;<a name="line.24"></a> -<span class="sourceLineNo">025</span>import java.util.ArrayDeque;<a name="line.25"></a> -<span class="sourceLineNo">026</span>import java.util.Comparator;<a name="line.26"></a> -<span class="sourceLineNo">027</span>import java.util.Deque;<a name="line.27"></a> -<span class="sourceLineNo">028</span>import java.util.Iterator;<a name="line.28"></a> -<span class="sourceLineNo">029</span>import java.util.List;<a name="line.29"></a> -<span class="sourceLineNo">030</span>import java.util.Queue;<a name="line.30"></a> -<span class="sourceLineNo">031</span>import java.util.SortedSet;<a name="line.31"></a> -<span class="sourceLineNo">032</span>import java.util.TreeSet;<a name="line.32"></a> -<span class="sourceLineNo">033</span>import java.util.concurrent.ExecutorService;<a name="line.33"></a> -<span class="sourceLineNo">034</span>import java.util.concurrent.Executors;<a name="line.34"></a> -<span class="sourceLineNo">035</span>import java.util.concurrent.atomic.AtomicBoolean;<a name="line.35"></a> -<span class="sourceLineNo">036</span>import java.util.concurrent.locks.Condition;<a name="line.36"></a> -<span class="sourceLineNo">037</span>import java.util.concurrent.locks.Lock;<a name="line.37"></a> -<span class="sourceLineNo">038</span>import java.util.concurrent.locks.ReentrantLock;<a name="line.38"></a> -<span class="sourceLineNo">039</span>import java.util.function.Supplier;<a name="line.39"></a> -<span class="sourceLineNo">040</span><a name="line.40"></a> -<span class="sourceLineNo">041</span>import org.apache.commons.logging.Log;<a name="line.41"></a> -<span class="sourceLineNo">042</span>import org.apache.commons.logging.LogFactory;<a name="line.42"></a> -<span class="sourceLineNo">043</span>import org.apache.hadoop.conf.Configuration;<a name="line.43"></a> -<span class="sourceLineNo">044</span>import org.apache.hadoop.fs.FileSystem;<a name="line.44"></a> -<span class="sourceLineNo">045</span>import org.apache.hadoop.fs.Path;<a name="line.45"></a> -<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.HBaseInterfaceAudience;<a name="line.46"></a> -<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.47"></a> -<span class="sourceLineNo">048</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.48"></a> -<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.client.ConnectionUtils;<a name="line.49"></a> -<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.50"></a> -<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.io.asyncfs.AsyncFSOutput;<a name="line.51"></a> -<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutputHelper.NameNodeException;<a name="line.52"></a> -<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.wal.AsyncFSWALProvider;<a name="line.53"></a> -<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.wal.WALEdit;<a name="line.54"></a> -<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.wal.WALKey;<a name="line.55"></a> -<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.wal.WALProvider.AsyncWriter;<a name="line.56"></a> -<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.shaded.com.google.common.util.concurrent.ThreadFactoryBuilder;<a name="line.57"></a> -<span class="sourceLineNo">058</span>import org.apache.hadoop.hbase.shaded.io.netty.channel.Channel;<a name="line.58"></a> -<span class="sourceLineNo">059</span>import org.apache.hadoop.hbase.shaded.io.netty.channel.EventLoop;<a name="line.59"></a> -<span class="sourceLineNo">060</span>import org.apache.hadoop.hbase.shaded.io.netty.util.concurrent.SingleThreadEventExecutor;<a name="line.60"></a> -<span class="sourceLineNo">061</span>import org.apache.hadoop.hdfs.protocol.DatanodeInfo;<a name="line.61"></a> -<span class="sourceLineNo">062</span>import org.apache.hadoop.ipc.RemoteException;<a name="line.62"></a> -<span class="sourceLineNo">063</span>import org.apache.htrace.core.Span;<a name="line.63"></a> -<span class="sourceLineNo">064</span>import org.apache.htrace.core.TraceScope;<a name="line.64"></a> -<span class="sourceLineNo">065</span><a name="line.65"></a> -<span class="sourceLineNo">066</span>import com.lmax.disruptor.RingBuffer;<a name="line.66"></a> -<span class="sourceLineNo">067</span>import com.lmax.disruptor.Sequence;<a name="line.67"></a> -<span class="sourceLineNo">068</span>import com.lmax.disruptor.Sequencer;<a name="line.68"></a> -<span class="sourceLineNo">069</span><a name="line.69"></a> -<span class="sourceLineNo">070</span>/**<a name="line.70"></a> -<span class="sourceLineNo">071</span> * An asynchronous implementation of FSWAL.<a name="line.71"></a> -<span class="sourceLineNo">072</span> * <p><a name="line.72"></a> -<span class="sourceLineNo">073</span> * Here 'waitingConsumePayloads' acts as the RingBuffer in FSHLog.<a name="line.73"></a> -<span class="sourceLineNo">074</span> * <p><a name="line.74"></a> -<span class="sourceLineNo">075</span> * For append, we process it as follow:<a name="line.75"></a> -<span class="sourceLineNo">076</span> * <ol><a name="line.76"></a> -<span class="sourceLineNo">077</span> * <li>In the caller thread(typically, in the rpc handler thread):<a name="line.77"></a> -<span class="sourceLineNo">078</span> * <ol><a name="line.78"></a> -<span class="sourceLineNo">079</span> * <li>Insert the entry into 'waitingConsumePayloads'. Use ringbuffer sequence as txid.</li><a name="line.79"></a> -<span class="sourceLineNo">080</span> * <li>Schedule the consumer task if needed. See {@link #shouldScheduleConsumer()} for more details.<a name="line.80"></a> -<span class="sourceLineNo">081</span> * </li><a name="line.81"></a> -<span class="sourceLineNo">082</span> * </ol><a name="line.82"></a> -<span class="sourceLineNo">083</span> * </li><a name="line.83"></a> -<span class="sourceLineNo">084</span> * <li>In the consumer task(in the EventLoop thread)<a name="line.84"></a> -<span class="sourceLineNo">085</span> * <ol><a name="line.85"></a> -<span class="sourceLineNo">086</span> * <li>Poll the entry from {@link #waitingConsumePayloads} and insert it into<a name="line.86"></a> -<span class="sourceLineNo">087</span> * {@link #toWriteAppends}</li><a name="line.87"></a> -<span class="sourceLineNo">088</span> * <li>Poll the entry from {@link #toWriteAppends}, append it to the AsyncWriter, and insert it into<a name="line.88"></a> -<span class="sourceLineNo">089</span> * {@link #unackedAppends}</li><a name="line.89"></a> -<span class="sourceLineNo">090</span> * <li>If the buffered size reaches {@link #batchSize}, or there is a sync request, then we call<a name="line.90"></a> -<span class="sourceLineNo">091</span> * sync on the AsyncWriter.</li><a name="line.91"></a> -<span class="sourceLineNo">092</span> * <li>In the callback methods:<a name="line.92"></a> -<span class="sourceLineNo">093</span> * <ul><a name="line.93"></a> -<span class="sourceLineNo">094</span> * <li>If succeeded, poll the entry from {@link #unackedAppends} and drop it.</li><a name="line.94"></a> -<span class="sourceLineNo">095</span> * <li>If failed, add all the entries in {@link #unackedAppends} back to {@link #toWriteAppends} and<a name="line.95"></a> -<span class="sourceLineNo">096</span> * wait for writing them again.</li><a name="line.96"></a> -<span class="sourceLineNo">097</span> * </ul><a name="line.97"></a> -<span class="sourceLineNo">098</span> * </li><a name="line.98"></a> -<span class="sourceLineNo">099</span> * </ol><a name="line.99"></a> -<span class="sourceLineNo">100</span> * </li><a name="line.100"></a> -<span class="sourceLineNo">101</span> * </ol><a name="line.101"></a> -<span class="sourceLineNo">102</span> * For sync, the processing stages are almost same. And different from FSHLog, we will open a new<a name="line.102"></a> -<span class="sourceLineNo">103</span> * writer and rewrite unacked entries to the new writer and sync again if we hit a sync error.<a name="line.103"></a> -<span class="sourceLineNo">104</span> * <p><a name="line.104"></a> -<span class="sourceLineNo">105</span> * Here we only describe the logic of doReplaceWriter. The main logic of rollWriter is same with<a name="line.105"></a> -<span class="sourceLineNo">106</span> * FSHLog.<br><a name="line.106"></a> -<span class="sourceLineNo">107</span> * For a normal roll request(for example, we have reached the log roll size):<a name="line.107"></a> -<span class="sourceLineNo">108</span> * <ol><a name="line.108"></a> -<span class="sourceLineNo">109</span> * <li>In the log roller thread, we will set {@link #waitingRoll} to true and<a name="line.109"></a> -<span class="sourceLineNo">110</span> * {@link #readyForRolling} to false, and then wait on {@link #readyForRolling}(see<a name="line.110"></a> -<span class="sourceLineNo">111</span> * {@link #waitForSafePoint()}).</li><a name="line.111"></a> -<span class="sourceLineNo">112</span> * <li>In the consumer thread, we will stop polling entries from {@link #waitingConsumePayloads} if<a name="line.112"></a> -<span class="sourceLineNo">113</span> * {@link #waitingRoll} is true, and also stop writing the entries in {@link #toWriteAppends} out.<a name="line.113"></a> -<span class="sourceLineNo">114</span> * </li><a name="line.114"></a> -<span class="sourceLineNo">115</span> * <li>If there are unflush data in the writer, sync them.</li><a name="line.115"></a> -<span class="sourceLineNo">116</span> * <li>When all out-going sync request is finished, i.e, the {@link #unackedAppends} is empty,<a name="line.116"></a> -<span class="sourceLineNo">117</span> * signal the {@link #readyForRollingCond}.</li><a name="line.117"></a> -<span class="sourceLineNo">118</span> * <li>Back to the log roller thread, now we can confirm that there are no out-going entries, i.e.,<a name="line.118"></a> -<span class="sourceLineNo">119</span> * we reach a safe point. So it is safe to replace old writer with new writer now.</li><a name="line.119"></a> -<span class="sourceLineNo">120</span> * <li>Set {@link #writerBroken} and {@link #waitingRoll} to false, cancel log roller exit checker<a name="line.120"></a> -<span class="sourceLineNo">121</span> * if any(see the comments in the {@link #syncFailed(Throwable)} method to see why we need a checker<a name="line.121"></a> -<span class="sourceLineNo">122</span> * here).</li><a name="line.122"></a> -<span class="sourceLineNo">123</span> * <li>Schedule the consumer task.</li><a name="line.123"></a> -<span class="sourceLineNo">124</span> * <li>Schedule a background task to close the old writer.</li><a name="line.124"></a> -<span class="sourceLineNo">125</span> * </ol><a name="line.125"></a> -<span class="sourceLineNo">126</span> * For a broken writer roll request, the only difference is that we can bypass the wait for safe<a name="line.126"></a> -<span class="sourceLineNo">127</span> * point stage. See the comments in the {@link #syncFailed(Throwable)} method for more details.<a name="line.127"></a> -<span class="sourceLineNo">128</span> */<a name="line.128"></a> -<span class="sourceLineNo">129</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a name="line.129"></a> -<span class="sourceLineNo">130</span>public class AsyncFSWAL extends AbstractFSWAL<AsyncWriter> {<a name="line.130"></a> -<span class="sourceLineNo">131</span><a name="line.131"></a> -<span class="sourceLineNo">132</span> private static final Log LOG = LogFactory.getLog(AsyncFSWAL.class);<a name="line.132"></a> +<span class="sourceLineNo">022</span>import com.lmax.disruptor.RingBuffer;<a name="line.22"></a> +<span class="sourceLineNo">023</span>import com.lmax.disruptor.Sequence;<a name="line.23"></a> +<span class="sourceLineNo">024</span>import com.lmax.disruptor.Sequencer;<a name="line.24"></a> +<span class="sourceLineNo">025</span><a name="line.25"></a> +<span class="sourceLineNo">026</span>import java.io.IOException;<a name="line.26"></a> +<span class="sourceLineNo">027</span>import java.io.InterruptedIOException;<a name="line.27"></a> +<span class="sourceLineNo">028</span>import java.lang.reflect.Field;<a name="line.28"></a> +<span class="sourceLineNo">029</span>import java.util.ArrayDeque;<a name="line.29"></a> +<span class="sourceLineNo">030</span>import java.util.Comparator;<a name="line.30"></a> +<span class="sourceLineNo">031</span>import java.util.Deque;<a name="line.31"></a> +<span class="sourceLineNo">032</span>import java.util.Iterator;<a name="line.32"></a> +<span class="sourceLineNo">033</span>import java.util.List;<a name="line.33"></a> +<span class="sourceLineNo">034</span>import java.util.Queue;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import java.util.SortedSet;<a name="line.35"></a> +<span class="sourceLineNo">036</span>import java.util.TreeSet;<a name="line.36"></a> +<span class="sourceLineNo">037</span>import java.util.concurrent.ExecutorService;<a name="line.37"></a> +<span class="sourceLineNo">038</span>import java.util.concurrent.Executors;<a name="line.38"></a> +<span class="sourceLineNo">039</span>import java.util.concurrent.LinkedBlockingQueue;<a name="line.39"></a> +<span class="sourceLineNo">040</span>import java.util.concurrent.ThreadPoolExecutor;<a name="line.40"></a> +<span class="sourceLineNo">041</span>import java.util.concurrent.TimeUnit;<a name="line.41"></a> +<span class="sourceLineNo">042</span>import java.util.concurrent.atomic.AtomicBoolean;<a name="line.42"></a> +<span class="sourceLineNo">043</span>import java.util.concurrent.locks.Condition;<a name="line.43"></a> +<span class="sourceLineNo">044</span>import java.util.concurrent.locks.Lock;<a name="line.44"></a> +<span class="sourceLineNo">045</span>import java.util.concurrent.locks.ReentrantLock;<a name="line.45"></a> +<span class="sourceLineNo">046</span>import java.util.function.Supplier;<a name="line.46"></a> +<span class="sourceLineNo">047</span><a name="line.47"></a> +<span class="sourceLineNo">048</span>import org.apache.commons.logging.Log;<a name="line.48"></a> +<span class="sourceLineNo">049</span>import org.apache.commons.logging.LogFactory;<a name="line.49"></a> +<span class="sourceLineNo">050</span>import org.apache.hadoop.conf.Configuration;<a name="line.50"></a> +<span class="sourceLineNo">051</span>import org.apache.hadoop.fs.FileSystem;<a name="line.51"></a> +<span class="sourceLineNo">052</span>import org.apache.hadoop.fs.Path;<a name="line.52"></a> +<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.HBaseInterfaceAudience;<a name="line.53"></a> +<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.client.ConnectionUtils;<a name="line.54"></a> +<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.55"></a> +<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.io.asyncfs.AsyncFSOutput;<a name="line.56"></a> +<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutputHelper.NameNodeException;<a name="line.57"></a> +<span class="sourceLineNo">058</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.58"></a> +<span class="sourceLineNo">059</span>import org.apache.hadoop.hbase.wal.AsyncFSWALProvider;<a name="line.59"></a> +<span class="sourceLineNo">060</span>import org.apache.hadoop.hbase.wal.WALEdit;<a name="line.60"></a> +<span class="sourceLineNo">061</span>import org.apache.hadoop.hbase.wal.WALKey;<a name="line.61"></a> +<span class="sourceLineNo">062</span>import org.apache.hadoop.hbase.wal.WALProvider.AsyncWriter;<a name="line.62"></a> +<span class="sourceLineNo">063</span>import org.apache.hadoop.hdfs.protocol.DatanodeInfo;<a name="line.63"></a> +<span class="sourceLineNo">064</span>import org.apache.hadoop.ipc.RemoteException;<a name="line.64"></a> +<span class="sourceLineNo">065</span>import org.apache.htrace.core.TraceScope;<a name="line.65"></a> +<span class="sourceLineNo">066</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.66"></a> +<span class="sourceLineNo">067</span><a name="line.67"></a> +<span class="sourceLineNo">068</span>import org.apache.hadoop.hbase.shaded.com.google.common.util.concurrent.ThreadFactoryBuilder;<a name="line.68"></a> +<span class="sourceLineNo">069</span>import org.apache.hadoop.hbase.shaded.io.netty.channel.Channel;<a name="line.69"></a> +<span class="sourceLineNo">070</span>import org.apache.hadoop.hbase.shaded.io.netty.channel.EventLoop;<a name="line.70"></a> +<span class="sourceLineNo">071</span>import org.apache.hadoop.hbase.shaded.io.netty.channel.EventLoopGroup;<a name="line.71"></a> +<span class="sourceLineNo">072</span>import org.apache.hadoop.hbase.shaded.io.netty.util.concurrent.SingleThreadEventExecutor;<a name="line.72"></a> +<span class="sourceLineNo">073</span><a name="line.73"></a> +<span class="sourceLineNo">074</span>/**<a name="line.74"></a> +<span class="sourceLineNo">075</span> * An asynchronous implementation of FSWAL.<a name="line.75"></a> +<span class="sourceLineNo">076</span> * <p><a name="line.76"></a> +<span class="sourceLineNo">077</span> * Here 'waitingConsumePayloads' acts as the RingBuffer in FSHLog.<a name="line.77"></a> +<span class="sourceLineNo">078</span> * <p><a name="line.78"></a> +<span class="sourceLineNo">079</span> * For append, we process it as follow:<a name="line.79"></a> +<span class="sourceLineNo">080</span> * <ol><a name="line.80"></a> +<span class="sourceLineNo">081</span> * <li>In the caller thread(typically, in the rpc handler thread):<a name="line.81"></a> +<span class="sourceLineNo">082</span> * <ol><a name="line.82"></a> +<span class="sourceLineNo">083</span> * <li>Insert the entry into 'waitingConsumePayloads'. Use ringbuffer sequence as txid.</li><a name="line.83"></a> +<span class="sourceLineNo">084</span> * <li>Schedule the consumer task if needed. See {@link #shouldScheduleConsumer()} for more details.<a name="line.84"></a> +<span class="sourceLineNo">085</span> * </li><a name="line.85"></a> +<span class="sourceLineNo">086</span> * </ol><a name="line.86"></a> +<span class="sourceLineNo">087</span> * </li><a name="line.87"></a> +<span class="sourceLineNo">088</span> * <li>In the consumer task(executed in a single threaded thread pool)<a name="line.88"></a> +<span class="sourceLineNo">089</span> * <ol><a name="line.89"></a> +<span class="sourceLineNo">090</span> * <li>Poll the entry from {@link #waitingConsumePayloads} and insert it into<a name="line.90"></a> +<span class="sourceLineNo">091</span> * {@link #toWriteAppends}</li><a name="line.91"></a> +<span class="sourceLineNo">092</span> * <li>Poll the entry from {@link #toWriteAppends}, append it to the AsyncWriter, and insert it into<a name="line.92"></a> +<span class="sourceLineNo">093</span> * {@link #unackedAppends}</li><a name="line.93"></a> +<span class="sourceLineNo">094</span> * <li>If the buffered size reaches {@link #batchSize}, or there is a sync request, then we call<a name="line.94"></a> +<span class="sourceLineNo">095</span> * sync on the AsyncWriter.</li><a name="line.95"></a> +<span class="sourceLineNo">096</span> * <li>In the callback methods:<a name="line.96"></a> +<span class="sourceLineNo">097</span> * <ul><a name="line.97"></a> +<span class="sourceLineNo">098</span> * <li>If succeeded, poll the entry from {@link #unackedAppends} and drop it.</li><a name="line.98"></a> +<span class="sourceLineNo">099</span> * <li>If failed, add all the entries in {@link #unackedAppends} back to {@link #toWriteAppends} and<a name="line.99"></a> +<span class="sourceLineNo">100</span> * wait for writing them again.</li><a name="line.100"></a> +<span class="sourceLineNo">101</span> * </ul><a name="line.101"></a> +<span class="sourceLineNo">102</span> * </li><a name="line.102"></a> +<span class="sourceLineNo">103</span> * </ol><a name="line.103"></a> +<span class="sourceLineNo">104</span> * </li><a name="line.104"></a> +<span class="sourceLineNo">105</span> * </ol><a name="line.105"></a> +<span class="sourceLineNo">106</span> * For sync, the processing stages are almost same. And different from FSHLog, we will open a new<a name="line.106"></a> +<span class="sourceLineNo">107</span> * writer and rewrite unacked entries to the new writer and sync again if we hit a sync error.<a name="line.107"></a> +<span class="sourceLineNo">108</span> * <p><a name="line.108"></a> +<span class="sourceLineNo">109</span> * Here we only describe the logic of doReplaceWriter. The main logic of rollWriter is same with<a name="line.109"></a> +<span class="sourceLineNo">110</span> * FSHLog.<br><a name="line.110"></a> +<span class="sourceLineNo">111</span> * For a normal roll request(for example, we have reached the log roll size):<a name="line.111"></a> +<span class="sourceLineNo">112</span> * <ol><a name="line.112"></a> +<span class="sourceLineNo">113</span> * <li>In the log roller thread, we will set {@link #waitingRoll} to true and<a name="line.113"></a> +<span class="sourceLineNo">114</span> * {@link #readyForRolling} to false, and then wait on {@link #readyForRolling}(see<a name="line.114"></a> +<span class="sourceLineNo">115</span> * {@link #waitForSafePoint()}).</li><a name="line.115"></a> +<span class="sourceLineNo">116</span> * <li>In the consumer thread, we will stop polling entries from {@link #waitingConsumePayloads} if<a name="line.116"></a> +<span class="sourceLineNo">117</span> * {@link #waitingRoll} is true, and also stop writing the entries in {@link #toWriteAppends} out.<a name="line.117"></a> +<span class="sourceLineNo">118</span> * </li><a name="line.118"></a> +<span class="sourceLineNo">119</span> * <li>If there are unflush data in the writer, sync them.</li><a name="line.119"></a> +<span class="sourceLineNo">120</span> * <li>When all out-going sync request is finished, i.e, the {@link #unackedAppends} is empty,<a name="line.120"></a> +<span class="sourceLineNo">121</span> * signal the {@link #readyForRollingCond}.</li><a name="line.121"></a> +<span class="sourceLineNo">122</span> * <li>Back to the log roller thread, now we can confirm that there are no out-going entries, i.e.,<a name="line.122"></a> +<span class="sourceLineNo">123</span> * we reach a safe point. So it is safe to replace old writer with new writer now.</li><a name="line.123"></a> +<span class="sourceLineNo">124</span> * <li>Set {@link #writerBroken} and {@link #waitingRoll} to false.</li><a name="line.124"></a> +<span class="sourceLineNo">125</span> * <li>Schedule the consumer task.</li><a name="line.125"></a> +<span class="sourceLineNo">126</span> * <li>Schedule a background task to close the old writer.</li><a name="line.126"></a> +<span class="sourceLineNo">127</span> * </ol><a name="line.127"></a> +<span class="sourceLineNo">128</span> * For a broken writer roll request, the only difference is that we can bypass the wait for safe<a name="line.128"></a> +<span class="sourceLineNo">129</span> * point stage.<a name="line.129"></a> +<span class="sourceLineNo">130</span> */<a name="line.130"></a> +<span class="sourceLineNo">131</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a name="line.131"></a> +<span class="sourceLineNo">132</span>public class AsyncFSWAL extends AbstractFSWAL<AsyncWriter> {<a name="line.132"></a> <span class="sourceLineNo">133</span><a name="line.133"></a> -<span class="sourceLineNo">134</span> private static final Comparator<SyncFuture> SEQ_COMPARATOR = (o1, o2) -> {<a name="line.134"></a> -<span class="sourceLineNo">135</span> int c = Long.compare(o1.getTxid(), o2.getTxid());<a name="line.135"></a> -<span class="sourceLineNo">136</span> return c != 0 ? c : Integer.compare(System.identityHashCode(o1), System.identityHashCode(o2));<a name="line.136"></a> -<span class="sourceLineNo">137</span> };<a name="line.137"></a> -<span class="sourceLineNo">138</span><a name="line.138"></a> -<span class="sourceLineNo">139</span> public static final String WAL_BATCH_SIZE = "hbase.wal.batch.size";<a name="line.139"></a> -<span class="sourceLineNo">140</span> public static final long DEFAULT_WAL_BATCH_SIZE = 64L * 1024;<a name="line.140"></a> -<span class="sourceLineNo">141</span><a name="line.141"></a> -<span class="sourceLineNo">142</span> public static final String ASYNC_WAL_CREATE_MAX_RETRIES = "hbase.wal.async.create.retries";<a name="line.142"></a> -<span class="sourceLineNo">143</span> public static final int DEFAULT_ASYNC_WAL_CREATE_MAX_RETRIES = 10;<a name="line.143"></a> -<span class="sourceLineNo">144</span><a name="line.144"></a> -<span class="sourceLineNo">145</span> private final EventLoop eventLoop;<a name="line.145"></a> +<span class="sourceLineNo">134</span> private static final Log LOG = LogFactory.getLog(AsyncFSWAL.class);<a name="line.134"></a> +<span class="sourceLineNo">135</span><a name="line.135"></a> +<span class="sourceLineNo">136</span> private static final Comparator<SyncFuture> SEQ_COMPARATOR = (o1, o2) -> {<a name="line.136"></a> +<span class="sourceLineNo">137</span> int c = Long.compare(o1.getTxid(), o2.getTxid());<a name="line.137"></a> +<span class="sourceLineNo">138</span> return c != 0 ? c : Integer.compare(System.identityHashCode(o1), System.identityHashCode(o2));<a name="line.138"></a> +<span class="sourceLineNo">139</span> };<a name="line.139"></a> +<span class="sourceLineNo">140</span><a name="line.140"></a> +<span class="sourceLineNo">141</span> public static final String WAL_BATCH_SIZE = "hbase.wal.batch.size";<a name="line.141"></a> +<span class="sourceLineNo">142</span> public static final long DEFAULT_WAL_BATCH_SIZE = 64L * 1024;<a name="line.142"></a> +<span class="sourceLineNo">143</span><a name="line.143"></a> +<span class="sourceLineNo">144</span> public static final String ASYNC_WAL_CREATE_MAX_RETRIES = "hbase.wal.async.create.retries";<a name="line.144"></a> +<span class="sourceLineNo">145</span> public static final int DEFAULT_ASYNC_WAL_CREATE_MAX_RETRIES = 10;<a name="line.145"></a> <span class="sourceLineNo">146</span><a name="line.146"></a> -<span class="sourceLineNo">147</span> private final Class<? extends Channel> channelClass;<a name="line.147"></a> -<span class="sourceLineNo">148</span><a name="line.148"></a> -<span class="sourceLineNo">149</span> private final Lock consumeLock = new ReentrantLock();<a name="line.149"></a> +<span class="sourceLineNo">147</span> public static final String ASYNC_WAL_USE_SHARED_EVENT_LOOP =<a name="line.147"></a> +<span class="sourceLineNo">148</span> "hbase.wal.async.use-shared-event-loop";<a name="line.148"></a> +<span class="sourceLineNo">149</span> public static final boolean DEFAULT_ASYNC_WAL_USE_SHARED_EVENT_LOOP = true;<a name="line.149"></a> <span class="sourceLineNo">150</span><a name="line.150"></a> -<span class="sourceLineNo">151</span> private final Runnable consumer = this::consume;<a name="line.151"></a> +<span class="sourceLineNo">151</span> private final EventLoopGroup eventLoopGroup;<a name="line.151"></a> <span class="sourceLineNo">152</span><a name="line.152"></a> -<span class="sourceLineNo">153</span> // check if there is already a consumer task in the event loop's task queue<a name="line.153"></a> -<span class="sourceLineNo">154</span> private final Supplier<Boolean> hasConsumerTask;<a name="line.154"></a> -<span class="sourceLineNo">155</span><a name="line.155"></a> -<span class="sourceLineNo">156</span> // new writer is created and we are waiting for old writer to be closed.<a name="line.156"></a> -<span class="sourceLineNo">157</span> private volatile boolean waitingRoll;<a name="line.157"></a> +<span class="sourceLineNo">153</span> private final ExecutorService consumeExecutor;<a name="line.153"></a> +<span class="sourceLineNo">154</span><a name="line.154"></a> +<span class="sourceLineNo">155</span> private final Class<? extends Channel> channelClass;<a name="line.155"></a> +<span class="sourceLineNo">156</span><a name="line.156"></a> +<span class="sourceLineNo">157</span> private final Lock consumeLock = new ReentrantLock();<a name="line.157"></a> <span class="sourceLineNo">158</span><a name="line.158"></a> -<span class="sourceLineNo">159</span> private boolean readyForRolling;<a name="line.159"></a> +<span class="sourceLineNo">159</span> private final Runnable consumer = this::consume;<a name="line.159"></a> <span class="sourceLineNo">160</span><a name="line.160"></a> -<span class="sourceLineNo">161</span> private final Condition readyForRollingCond = consumeLock.newCondition();<a name="line.161"></a> -<span class="sourceLineNo">162</span><a name="line.162"></a> -<span class="sourceLineNo">163</span> private final RingBuffer<RingBufferTruck> waitingConsumePayloads;<a name="line.163"></a> -<span class="sourceLineNo">164</span><a name="line.164"></a> -<span class="sourceLineNo">165</span> private final Sequence waitingConsumePayloadsGatingSequence;<a name="line.165"></a> -<span class="sourceLineNo">166</span><a name="line.166"></a> -<span class="sourceLineNo">167</span> private final AtomicBoolean consumerScheduled = new AtomicBoolean(false);<a name="line.167"></a> -<span class="sourceLineNo">168</span><a name="line.168"></a> -<span class="sourceLineNo">169</span> // writer is broken and rollWriter is needed.<a name="line.169"></a> -<span class="sourceLineNo">170</span> private volatile boolean writerBroken;<a name="line.170"></a> -<span class="sourceLineNo">171</span><a name="line.171"></a> -<span class="sourceLineNo">172</span> private final long batchSize;<a name="line.172"></a> +<span class="sourceLineNo">161</span> // check if there is already a consumer task in the event loop's task queue<a name="line.161"></a> +<span class="sourceLineNo">162</span> private final Supplier<Boolean> hasConsumerTask;<a name="line.162"></a> +<span class="sourceLineNo">163</span><a name="line.163"></a> +<span class="sourceLineNo">164</span> private static final int MAX_EPOCH = 0x3FFFFFFF;<a name="line.164"></a> +<span class="sourceLineNo">165</span> // the lowest bit is waitingRoll, which means new writer is created and we are waiting for old<a name="line.165"></a> +<span class="sourceLineNo">166</span> // writer to be closed.<a name="line.166"></a> +<span class="sourceLineNo">167</span> // the second lowest bit is writerBorken which means the current writer is broken and rollWriter<a name="line.167"></a> +<span class="sourceLineNo">168</span> // is needed.<a name="line.168"></a> +<span class="sourceLineNo">169</span> // all other bits are the epoch number of the current writer, this is used to detect whether the<a name="line.169"></a> +<span class="sourceLineNo">170</span> // writer is still the one when you issue the sync.<a name="line.170"></a> +<span class="sourceLineNo">171</span> // notice that, modification to this field is only allowed under the protection of consumeLock.<a name="line.171"></a> +<span class="sourceLineNo">172</span> private volatile int epochAndState;<a name="line.172"></a> <span class="sourceLineNo">173</span><a name="line.173"></a> -<span class="sourceLineNo">174</span> private final int createMaxRetries;<a name="line.174"></a> -<span class="sourceLineNo">175</span><a name="line.175"></a> -<span class="sourceLineNo">176</span> private final ExecutorService closeExecutor = Executors.newCachedThreadPool(<a name="line.176"></a> -<span class="sourceLineNo">177</span> new ThreadFactoryBuilder().setDaemon(true).setNameFormat("Close-WAL-Writer-%d").build());<a name="line.177"></a> +<span class="sourceLineNo">174</span> // used to guard the log roll request when we exceed the log roll size.<a name="line.174"></a> +<span class="sourceLineNo">175</span> private boolean rollRequested;<a name="line.175"></a> +<span class="sourceLineNo">176</span><a name="line.176"></a> +<span class="sourceLineNo">177</span> private boolean readyForRolling;<a name="line.177"></a> <span class="sourceLineNo">178</span><a name="line.178"></a> -<span class="sourceLineNo">179</span> private volatile AsyncFSOutput fsOut;<a name="line.179"></a> +<span class="sourceLineNo">179</span> private final Condition readyForRollingCond = consumeLock.newCondition();<a name="line.179"></a> <span class="sourceLineNo">180</span><a name="line.180"></a> -<span class="sourceLineNo">181</span> private final Deque<FSWALEntry> toWriteAppends = new ArrayDeque<>();<a name="line.181"></a> +<span class="sourceLineNo">181</span> private final RingBuffer<RingBufferTruck> waitingConsumePayloads;<a name="line.181"></a> <span class="sourceLineNo">182</span><a name="line.182"></a> -<span class="sourceLineNo">183</span> private final Deque<FSWALEntry> unackedAppends = new ArrayDeque<>();<a name="line.183"></a> +<span class="sourceLineNo">183</span> private final Sequence waitingConsumePayloadsGatingSequence;<a name="line.183"></a> <span class="sourceLineNo">184</span><a name="line.184"></a> -<span class="sourceLineNo">185</span> private final SortedSet<SyncFuture> syncFutures = new TreeSet<>(SEQ_COMPARATOR);<a name="line.185"></a> +<span class="sourceLineNo">185</span> private final AtomicBoolean consumerScheduled = new AtomicBoolean(false);<a name="line.185"></a> <span class="sourceLineNo">186</span><a name="line.186"></a> -<span class="sourceLineNo">187</span> // the highest txid of WAL entries being processed<a name="line.187"></a> -<span class="sourceLineNo">188</span> private long highestProcessedAppendTxid;<a name="line.188"></a> -<span class="sourceLineNo">189</span><a name="line.189"></a> -<span class="sourceLineNo">190</span> // file length when we issue last sync request on the writer<a name="line.190"></a> -<span class="sourceLineNo">191</span> private long fileLengthAtLastSync;<a name="line.191"></a> -<span class="sourceLineNo">192</span><a name="line.192"></a> -<span class="sourceLineNo">193</span> private long highestProcessedAppendTxidAtLastSync;<a name="line.193"></a> -<span class="sourceLineNo">194</span><a name="line.194"></a> -<span class="sourceLineNo">195</span> public AsyncFSWAL(FileSystem fs, Path rootDir, String logDir, String archiveDir,<a name="line.195"></a> -<span class="sourceLineNo">196</span> Configuration conf, List<WALActionsListener> listeners, boolean failIfWALExists,<a name="line.196"></a> -<span class="sourceLineNo">197</span> String prefix, String suffix, EventLoop eventLoop, Class<? extends Channel> channelClass)<a name="line.197"></a> -<span class="sourceLineNo">198</span> throws FailedLogCloseException, IOException {<a name="line.198"></a> -<span class="sourceLineNo">199</span> super(fs, rootDir, logDir, archiveDir, conf, listeners, failIfWALExists, prefix, suffix);<a name="line.199"></a> -<span class="sourceLineNo">200</span> this.eventLoop = eventLoop;<a name="line.200"></a> -<span class="sourceLineNo">201</span> this.channelClass = channelClass;<a name="line.201"></a> -<span class="sourceLineNo">202</span> Supplier<Boolean> hasConsumerTask;<a name="line.202"></a> -<span class="sourceLineNo">203</span> if (eventLoop instanceof SingleThreadEventExecutor) {<a name="line.203"></a> +<span class="sourceLineNo">187</span> private final long batchSize;<a name="line.187"></a> +<span class="sourceLineNo">188</span><a name="line.188"></a> +<span class="sourceLineNo">189</span> private final int createMaxRetries;<a name="line.189"></a> +<span class="sourceLineNo">190</span><a name="line.190"></a> +<span class="sourceLineNo">191</span> private final ExecutorService closeExecutor = Executors.newCachedThreadPool(<a name="line.191"></a> +<span class="sourceLineNo">192</span> new ThreadFactoryBuilder().setDaemon(true).setNameFormat("Close-WAL-Writer-%d").build());<a name="line.192"></a> +<span class="sourceLineNo">193</span><a name="line.193"></a> +<span class="sourceLineNo">194</span> private volatile AsyncFSOutput fsOut;<a name="line.194"></a> +<span class="sourceLineNo">195</span><a name="line.195"></a> +<span class="sourceLineNo">196</span> private final Deque<FSWALEntry> toWriteAppends = new ArrayDeque<>();<a name="line.196"></a> +<span class="sourceLineNo">197</span><a name="line.197"></a> +<span class="sourceLineNo">198</span> private final Deque<FSWALEntry> unackedAppends = new ArrayDeque<>();<a name="line.198"></a> +<span class="sourceLineNo">199</span><a name="line.199"></a> +<span class="sourceLineNo">200</span> private final SortedSet<SyncFuture> syncFutures = new TreeSet<>(SEQ_COMPARATOR);<a name="line.200"></a> +<span class="sourceLineNo">201</span><a name="line.201"></a> +<span class="sourceLineNo">202</span> // the highest txid of WAL entries being processed<a name="line.202"></a> +<span class="sourceLineNo">203</span> private long highestProcessedAppendTxid;<a name="line.203"></a> <span class="sourceLineNo">204</span><a name="line.204"></a> -<span class="sourceLineNo">205</span> try {<a name="line.205"></a> -<span class="sourceLineNo">206</span> Field field = SingleThreadEventExecutor.class.getDeclaredField("taskQueue");<a name="line.206"></a> -<span class="sourceLineNo">207</span> field.setAccessible(true);<a name="line.207"></a> -<span class="sourceLineNo">208</span> Queue<?> queue = (Queue<?>) field.get(eventLoop);<a name="line.208"></a> -<span class="sourceLineNo">209</span> hasConsumerTask = () -> queue.peek() == consumer;<a name="line.209"></a> -<span class="sourceLineNo">210</span> } catch (Exception e) {<a name="line.210"></a> -<span class="sourceLineNo">211</span> LOG.warn("Can not get task queue of " + eventLoop + ", this is not necessary, just give up",<a name="line.211"></a> -<span class="sourceLineNo">212</span> e);<a name="line.212"></a> -<span class="sourceLineNo">213</span> hasConsumerTask = () -> false;<a name="line.213"></a> -<span class="sourceLineNo">214</span> }<a name="line.214"></a> -<span class="sourceLineNo">215</span> } else {<a name="line.215"></a> -<span class="sourceLineNo">216</span> hasConsumerTask = () -> false;<a name="line.216"></a> -<span class="sourceLineNo">217</span> }<a name="line.217"></a> -<span class="sourceLineNo">218</span> this.hasConsumerTask = hasConsumerTask;<a name="line.218"></a> -<span class="sourceLineNo">219</span> int preallocatedEventCount =<a name="line.219"></a> -<span class="sourceLineNo">220</span> this.conf.getInt("hbase.regionserver.wal.disruptor.event.count", 1024 * 16);<a name="line.220"></a> -<span class="sourceLineNo">221</span> waitingConsumePayloads =<a name="line.221"></a> -<span class="sourceLineNo">222</span> RingBuffer.createMultiProducer(RingBufferTruck::new, preallocatedEventCount);<a name="line.222"></a> -<span class="sourceLineNo">223</span> waitingConsumePayloadsGatingSequence = new Sequence(Sequencer.INITIAL_CURSOR_VALUE);<a name="line.223"></a> -<span class="sourceLineNo">224</span> waitingConsumePayloads.addGatingSequences(waitingConsumePayloadsGatingSequence);<a name="line.224"></a> -<span class="sourceLineNo">225</span><a name="line.225"></a> -<span class="sourceLineNo">226</span> // inrease the ringbuffer sequence so our txid is start from 1<a name="line.226"></a> -<span class="sourceLineNo">227</span> waitingConsumePayloads.publish(waitingConsumePayloads.next());<a name="line.227"></a> -<span class="sourceLineNo">228</span> waitingConsumePayloadsGatingSequence.set(waitingConsumePayloads.getCursor());<a name="line.228"></a> -<span class="sourceLineNo">229</span><a name="line.229"></a> -<span class="sourceLineNo">230</span> batchSize = conf.getLong(WAL_BATCH_SIZE, DEFAULT_WAL_BATCH_SIZE);<a name="line.230"></a> -<span class="sourceLineNo">231</span> createMaxRetries =<a name="line.231"></a> -<span class="sourceLineNo">232</span> conf.getInt(ASYNC_WAL_CREATE_MAX_RETRIES, DEFAULT_ASYNC_WAL_CREATE_MAX_RETRIES);<a name="line.232"></a> -<span class="sourceLineNo">233</span> rollWriter();<a name="line.233"></a> -<span class="sourceLineNo">234</span> }<a name="line.234"></a> -<span class="sourceLineNo">235</span><a name="line.235"></a> -<span class="sourceLineNo">236</span> // return whether we have successfully set readyForRolling to true.<a name="line.236"></a> -<span class="sourceLineNo">237</span> private boolean trySetReadyForRolling() {<a name="line.237"></a> -<span class="sourceLineNo">238</span> // Check without holding lock first. Usually we will just return here.<a name="line.238"></a> -<span class="sourceLineNo">239</span> // waitingRoll is volatile and unacedEntries is only accessed inside event loop so it is safe to<a name="line.239"></a> -<span class="sourceLineNo">240</span> // check them outside the consumeLock.<a name="line.240"></a> -<span class="sourceLineNo">241</span> if (!waitingRoll || !unackedAppends.isEmpty()) {<a name="line.241"></a> -<span class="sourceLineNo">242</span> return false;<a name="line.242"></a> -<span class="sourceLineNo">243</span> }<a name="line.243"></a> -<span class="sourceLineNo">244</span> consumeLock.lock();<a name="line.244"></a> -<span class="sourceLineNo">245</span> try {<a name="line.245"></a> -<span class="sourceLineNo">246</span> // 1. a roll is requested<a name="line.246"></a> -<span class="sourceLineNo">247</span> // 2. all out-going entries have been acked(we have confirmed above).<a name="line.247"></a> -<span class="sourceLineNo">248</span> if (waitingRoll) {<a name="line.248"></a> -<span class="sourceLineNo">249</span> readyForRolling = true;<a name="line.249"></a> -<span class="sourceLineNo">250</span> readyForRollingCond.signalAll();<a name="line.250"></a> -<span class="sourceLineNo">251</span> return true;<a name="line.251"></a> -<span class="sourceLineNo">252</span> } else {<a name="line.252"></a> -<span class="sourceLineNo">253</span> return false;<a name="line.253"></a> -<span class="sourceLineNo">254</span> }<a name="line.254"></a> -<span class="sourceLineNo">255</span> } finally {<a name="line.255"></a> -<span class="sourceLineNo">256</span> consumeLock.unlock();<a name="line.256"></a> -<span class="sourceLineNo">257</span> }<a name="line.257"></a> +<span class="sourceLineNo">205</span> // file length when we issue last sync request on the writer<a name="line.205"></a> +<span class="sourceLineNo">206</span> private long fileLengthAtLastSync;<a name="line.206"></a> +<span class="sourceLineNo">207</span><a name="line.207"></a> +<span class="sourceLineNo">208</span> private long highestProcessedAppendTxidAtLastSync;<a name="line.208"></a> +<span class="sourceLineNo">209</span><a name="line.209"></a> +<span class="sourceLineNo">210</span> public AsyncFSWAL(FileSystem fs, Path rootDir, String logDir, String archiveDir,<a name="line.210"></a> +<span class="sourceLineNo">211</span> Configuration conf, List<WALActionsListener> listeners, boolean failIfWALExists,<a name="line.211"></a> +<span class="sourceLineNo">212</span> String prefix, String suffix, EventLoopGroup eventLoopGroup,<a name="line.212"></a> +<span class="sourceLineNo">213</span> Class<? extends Channel> channelClass) throws FailedLogCloseException, IOException {<a name="line.213"></a> +<span class="sourceLineNo">214</span> super(fs, rootDir, logDir, archiveDir, conf, listeners, failIfWALExists, prefix, suffix);<a name="line.214"></a> +<span class="sourceLineNo">215</span> this.eventLoopGroup = eventLoopGroup;<a name="line.215"></a> +<span class="sourceLineNo">216</span> this.channelClass = channelClass;<a name="line.216"></a> +<span class="sourceLineNo">217</span> Supplier<Boolean> hasConsumerTask;<a name="line.217"></a> +<span class="sourceLineNo">218</span> if (conf.getBoolean(ASYNC_WAL_USE_SHARED_EVENT_LOOP, DEFAULT_ASYNC_WAL_USE_SHARED_EVENT_LOOP)) {<a name="line.218"></a> +<span class="sourceLineNo">219</span> this.consumeExecutor = eventLoopGroup.next();<a name="line.219"></a> +<span class="sourceLineNo">220</span> if (consumeExecutor instanceof SingleThreadEventExecutor) {<a name="line.220"></a> +<span class="sourceLineNo">221</span> try {<a name="line.221"></a> +<span class="sourceLineNo">222</span> Field field = SingleThreadEventExecutor.class.getDeclaredField("taskQueue");<a name="line.222"></a> +<span class="sourceLineNo">223</span> field.setAccessible(true);<a name="line.223"></a> +<span class="sourceLineNo">224</span> Queue<?> queue = (Queue<?>) field.get(consumeExecutor);<a name="line.224"></a> +<span class="sourceLineNo">225</span> hasConsumerTask = () -> queue.peek() == consumer;<a name="line.225"></a> +<span class="sourceLineNo">226</span> } catch (Exception e) {<a name="line.226"></a> +<span class="sourceLineNo">227</span> LOG.warn("Can not get task queue of " + consumeExecutor +<a name="line.227"></a> +<span class="sourceLineNo">228</span> ", this is not necessary, just give up", e);<a name="line.228"></a> +<span class="sourceLineNo">229</span> hasConsumerTask = () -> false;<a name="line.229"></a> +<span class="sourceLineNo">230</span> }<a name="line.230"></a> +<span class="sourceLineNo">231</span> } else {<a name="line.231"></a> +<span class="sourceLineNo">232</span> hasConsumerTask = () -> false;<a name="line.232"></a> +<span class="sourceLineNo">233</span> }<a name="line.233"></a> +<span class="sourceLineNo">234</span> } else {<a name="line.234"></a> +<span class="sourceLineNo">235</span> ThreadPoolExecutor threadPool =<a name="line.235"></a> +<span class="sourceLineNo">236</span> new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(),<a name="line.236"></a> +<span class="sourceLineNo">237</span> new ThreadFactoryBuilder().setNameFormat("AsyncFSWAL-%d").setDaemon(true).build());<a name="line.237"></a> +<span class="sourceLineNo">238</span> hasConsumerTask = () -> threadPool.getQueue().peek() == consumer;<a name="line.238"></a> +<span class="sourceLineNo">239</span> this.consumeExecutor = threadPool;<a name="line.239"></a> +<span class="sourceLineNo">240</span> }<a name="line.240"></a> +<span class="sourceLineNo">241</span><a name="line.241"></a> +<span class="sourceLineNo">242</span> this.hasConsumerTask = hasConsumerTask;<a name="line.242"></a> +<span class="sourceLineNo">243</span> int preallocatedEventCount =<a name="line.243"></a> +<span class="sourceLineNo">244</span> conf.getInt("hbase.regionserver.wal.disruptor.event.count", 1024 * 16);<a name="line.244"></a> +<span class="sourceLineNo">245</span> waitingConsumePayloads =<a name="line.245"></a> +<span class="sourceLineNo">246</span> RingBuffer.createMultiProducer(RingBufferTruck::new, preallocatedEventCount);<a name="line.246"></a> +<span class="sourceLineNo">247</span> waitingConsumePayloadsGatingSequence = new Sequence(Sequencer.INITIAL_CURSOR_VALUE);<a name="line.247"></a> +<span class="sourceLineNo">248</span> waitingConsumePayloads.addGatingSequences(waitingConsumePayloadsGatingSequence);<a name="line.248"></a> +<span class="sourceLineNo">249</span><a name="line.249"></a> +<span class="sourceLineNo">250</span> // inrease the ringbuffer sequence so our txid is start from 1<a name="line.250"></a> +<span class="sourceLineNo">251</span> waitingConsumePayloads.publish(waitingConsumePayloads.next());<a name="line.251"></a> +<span class="sourceLineNo">252</span> waitingConsumePayloadsGatingSequence.set(waitingConsumePayloads.getCursor());<a name="line.252"></a> +<span class="sourceLineNo">253</span><a name="line.253"></a> +<span class="sourceLineNo">254</span> batchSize = conf.getLong(WAL_BATCH_SIZE, DEFAULT_WAL_BATCH_SIZE);<a name="line.254"></a> +<span class="sourceLineNo">255</span> createMaxRetries =<a name="line.255"></a> +<span class="sourceLineNo">256</span> conf.getInt(ASYNC_WAL_CREATE_MAX_RETRIES, DEFAULT_ASYNC_WAL_CREATE_MAX_RETRIES);<a name="line.256"></a> +<span class="sourceLineNo">257</span> rollWriter();<a name="line.257"></a> <span class="sourceLineNo">258</span> }<a name="line.258"></a> <span class="sourceLineNo">259</span><a name="line.259"></a> -<span class="sourceLineNo">260</span> private void syncFailed(Throwable error) {<a name="line.260"></a> -<span class="sourceLineNo">261</span> LOG.warn("sync failed", error);<a name="line.261"></a> -<span class="sourceLineNo">262</span> // Here we depends on the implementation of FanOutOneBlockAsyncDFSOutput and netty.<a name="line.262"></a> -<span class="sourceLineNo">263</span> // When error occur, FanOutOneBlockAsyncDFSOutput will fail all pending flush requests. It<a name="line.263"></a> -<span class="sourceLineNo">264</span> // is execute inside EventLoop. And in DefaultPromise in netty, it will notifyListener<a name="line.264"></a> -<span class="sourceLineNo">265</span> // directly if it is already in the EventLoop thread. And in the listener method, it will<a name="line.265"></a> -<span class="sourceLineNo">266</span> // call us. So here we know that all failed flush request will call us continuously, and<a name="line.266"></a> -<span class="sourceLineNo">267</span> // before the last one finish, no other task can be executed in EventLoop. So here we are<a name="line.267"></a> -<span class="sourceLineNo">268</span> // safe to use writerBroken as a guard.<a name="line.268"></a> -<span class="sourceLineNo">269</span> // Do not forget to revisit this if we change the implementation of<a name="line.269"></a> -<span class="sourceLineNo">270</span> // FanOutOneBlockAsyncDFSOutput!<a name="line.270"></a> -<span class="sourceLineNo">271</span> consumeLock.lock();<a name="line.271"></a> -<span class="sourceLineNo">272</span> try {<a name="line.272"></a> -<span class="sourceLineNo">273</span> if (writerBroken) {<a name="line.273"></a> -<span class="sourceLineNo">274</span> return;<a name="line.274"></a> -<span class="sourceLineNo">275</span> }<a name="line.275"></a> -<span class="sourceLineNo">276</span> writerBroken = true;<a name="line.276"></a> -<span class="sourceLineNo">277</span> if (waitingRoll) {<a name="line.277"></a> -<span class="sourceLineNo">278</span> readyForRolling = true;<a name="line.278"></a> -<span class="sourceLineNo">279</span> readyForRollingCond.signalAll();<a name="line.279"></a> -<span class="sourceLineNo">280</span> }<a name="line.280"></a> -<span class="sourceLineNo">281</span> } finally {<a name="line.281"></a> -<span class="sourceLineNo">282</span> consumeLock.unlock();<a name="line.282"></a> -<span class="sourceLineNo">283</span> }<a name="line.283"></a> -<span class="sourceLineNo">284</span> for (Iterator<FSWALEntry> iter = unackedAppends.descendingIterator(); iter.hasNext();) {<a name="line.284"></a> -<span class="sourceLineNo">285</span> toWriteAppends.addFirst(iter.next());<a name="line.285"></a> -<span class="sourceLineNo">286</span> }<a name="line.286"></a> -<span class="sourceLineNo">287</span> highestUnsyncedTxid = highestSyncedTxid.get();<a name="line.287"></a> -<span class="sourceLineNo">288</span> // request a roll.<a name="line.288"></a> -<span class="sourceLineNo">289</span> requestLogRoll();<a name="line.289"></a> -<span class="sourceLineNo">290</span> }<a name="line.290"></a> -<span class="sourceLineNo">291</span><a name="line.291"></a> -<span class="sourceLineNo">292</span> private void syncCompleted(AsyncWriter writer, long processedTxid, long startTimeNs) {<a name="line.292"></a> -<span class="sourceLineNo">293</span> highestSyncedTxid.set(processedTxid);<a name="line.293"></a> -<span class="sourceLineNo">294</span> for (Iterator<FSWALEntry> iter = unackedAppends.iterator(); iter.hasNext();) {<a name="line.294"></a> -<span class="sourceLineNo">295</span> if (iter.next().getTxid() <= processedTxid) {<a name="line.295"></a> -<span class="sourceLineNo">296</span> iter.remove();<a name="line.296"></a> -<span class="sourceLineNo">297</span> } else {<a name="line.297"></a> -<span class="sourceLineNo">298</span> break;<a name="line.298"></a> -<span class="sourceLineNo">299</span> }<a name="line.299"></a> -<span class="sourceLineNo">300</span> }<a name="line.300"></a> -<span class="sourceLineNo">301</span> postSync(System.nanoTime() - startTimeNs, finishSync(true));<a name="line.301"></a> -<span class="sourceLineNo">302</span> // Ideally, we should set a flag to indicate that the log roll has already been requested for<a name="line.302"></a> -<span class="sourceLineNo">303</span> // the current writer and give up here, and reset the flag when roll is finished. But we<a name="line.303"></a> -<span class="sourceLineNo">304</span> // finish roll in the log roller thread so the flag need to be set by different thread which<a name="line.304"></a> -<span class="sourceLineNo">305</span> // typically means we need to use a lock to protect it and do fencing. As the log roller will<a name="line.305"></a> -<span class="sourceLineNo">306</span> // aggregate the roll requests of the same WAL, so it is safe to call requestLogRoll multiple<a name="line.306"></a> -<span class="sourceLineNo">307</span> // times before the roll actual happens. But we need to stop if we set readyForRolling to true<a name="line.307"></a> -<span class="sourceLineNo">308</span> // and wake up the log roller thread waiting in waitForSafePoint as the rollWriter call may<a name="line.308"></a> -<span class="sourceLineNo">309</span> // return firstly and then we run the code below and request a roll on the new writer.<a name="line.309"></a> -<span class="sourceLineNo">310</span> if (trySetReadyForRolling()) {<a name="line.310"></a> -<span class="sourceLineNo">311</span> // we have just finished a roll, then do not need to check for log rolling, the writer will be<a name="line.311"></a> -<span class="sourceLineNo">312</span> // closed soon.<a name="line.312"></a> -<span class="sourceLineNo">313</span> return;<a name="line.313"></a> -<span class="sourceLineNo">314</span> }<a name="line.314"></a> -<span class="sourceLineNo">315</span> if (writer.getLength() < logrollsize) {<a name="line.315"></a> -<span class="sourceLineNo">316</span> return;<a name="line.316"></a> -<span class="sourceLineNo">317</span> }<a name="line.317"></a> -<span class="sourceLineNo">318</span> if (!rollWriterLock.tryLock()) {<a name="line.318"></a> -<span class="sourceLineNo">319</span> return;<a name="line.319"></a> -<span class="sourceLineNo">320</span> }<a name="line.320"></a> -<span class="sourceLineNo">321</span> try {<a name="line.321"></a> -<span class="sourceLineNo">322</span> requestLogRoll();<a name="line.322"></a> -<span class="sourceLineNo">323</span> } finally {<a name="line.323"></a> -<span class="sourceLineNo">324</span> rollWriterLock.unlock();<a name="line.324"></a> -<span class="sourceLineNo">325</span> }<a name="line.325"></a> -<span class="sourceLineNo">326</span> }<a name="line.326"></a> -<span class="sourceLineNo">327</span><a name="line.327"></a> -<span class="sourceLineNo">328</span> private void sync(AsyncWriter writer) {<a name="line.328"></a> -<span class="sourceLineNo">329</span> fileLengthAtLastSync = writer.getLength();<a name="line.329"></a> -<span class="sourceLineNo">330</span> long currentHighestProcessedAppendTxid = highestProcessedAppendTxid;<a name="line.330"></a> -<span class="sourceLineNo">331</span> highestProcessedAppendTxidAtLastSync = currentHighestProcessedAppendTxid;<a name="line.331"></a> -<span class="sourceLineNo">332</span> final long startTimeNs = System.nanoTime();<a name="line.332"></a> -<span class="sourceLineNo">333</span> writer.sync().whenComplete((result, error) -> {<a name="line.333"></a> -<span class="sourceLineNo">334</span> if (error != null) {<a name="line.334"></a> -<span class="sourceLineNo">335</span> syncFailed(error);<a name="line.335"></a> -<span class="sourceLineNo">336</span> } else {<a name="line.336"></a> -<span class="sourceLineNo">337</span> syncCompleted(writer, currentHighestProcessedAppendTxid, startTimeNs);<a name="line.337"></a> -<span class="sourceLineNo">338</span> }<a name="line.338"></a> -<span class="sourceLineNo">339</span> });<a name="line.339"></a> -<span class="sourceLineNo">340</span> }<a name="line.340"></a> -<span class="sourceLineNo">341</span><a name="line.341"></a> -<span class="sourceLineNo">342</span> private void addTimeAnnotation(SyncFuture future, String annotation) {<a name="line.342"></a> -<span class="sourceLineNo">343</span> TraceUtil.addTimelineAnnotation(annotation);<a name="line.343"></a> -<span class="sourceLineNo">344</span> //TODO handle htrace API change, see HBASE-18895<a name="line.344"></a> -<span class="sourceLineNo">345</span> //future.setSpan(scope.getSpan());<a name="line.345"></a> -<span class="sourceLineNo">346</span> }<a name="line.346"></a> -<span class="sourceLineNo">347</span><a name="line.347"></a> -<span class="sourceLineNo">348</span> private int finishSyncLowerThanTxid(long txid, boolean addSyncTrace) {<a name="line.348"></a> -<span class="sourceLineNo">349</span> int finished = 0;<a name="line.349"></a> -<span class="sourceLineNo">350</span> for (Iterator<SyncFuture> iter = syncFutures.iterator(); iter.hasNext();) {<a name="line.350"></a> -<span class="sourceLineNo">351</span> SyncFuture sync = iter.next();<a name="line.351"></a> -<span class="sourceLineNo">352</span> if (sync.getTxid() <= txid) {<a name="line.352"></a> -<span class="sourceLineNo">353</span> sync.done(txid, null);<a name="line.353"></a> -<span class="sourceLineNo">354</span> iter.remove();<a name="line.354"></a> -<span class="sourceLineNo">355</span> finished++;<a name="line.355"></a> -<span class="sourceLineNo">356</span> if (addSyncTrace) {<a name="line.356"></a> -<span class="sourceLineNo">357</span> addTimeAnnotation(sync, "writer synced");<a name="line.357"></a> -<span class="sourceLineNo">358</span> }<a name="line.358"></a> -<span class="sourceLineNo">359</span> } else {<a name="line.359"></a> -<span class="sourceLineNo">360</span> break;<a name="line.360"></a> -<span class="sourceLineNo">361</span> }<a name="line.361"></a> -<span class="sourceLineNo">362</span> }<a name="line.362"></a> -<span class="sourceLineNo">363</span> return finished;<a name="line.363"></a> +<span class="sourceLineNo">260</span> private static boolean waitingRoll(int epochAndState) {<a name="line.260"></a> +<span class="sourceLineNo">261</span> return (epochAndState & 1) != 0;<a name="line.261"></a> +<span class="sourceLineNo">262</span> }<a name="line.262"></a> +<span class="sourceLineNo">263</span><a name="line.263"></a> +<span class="sourceLineNo">264</span> private static boolean writerBroken(int epochAndState) {<a name="line.264"></a> +<span class="sourceLineNo">265</span> return ((epochAndState >>> 1) & 1) != 0;<a name="line.265"></a> +<span class="sourceLineNo">266</span> }<a name="line.266"></a> +<span class="sourceLineNo">267</span><a name="line.267"></a> +<span class="sourceLineNo">268</span> private static int epoch(int epochAndState) {<a name="line.268"></a> +<span class="sourceLineNo">269</span> return epochAndState >>> 2;<a name="line.269"></a> +<span class="sourceLineNo">270</span> }<a name="line.270"></a> +<span class="sourceLineNo">271</span><a name="line.271"></a> +<span class="sourceLineNo">272</span> // return whether we have successfully set readyForRolling to true.<a name="line.272"></a> +<span class="sourceLineNo">273</span> private boolean trySetReadyForRolling() {<a name="line.273"></a> +<span class="sourceLineNo">274</span> // Check without holding lock first. Usually we will just return here.<a name="line.274"></a> +<span class="sourceLineNo">275</span> // waitingRoll is volatile and unacedEntries is only accessed inside event loop so it is safe to<a name="line.275"></a> +<span class="sourceLineNo">276</span> // check them outside the consumeLock.<a name="line.276"></a> +<span class="sourceLineNo">277</span> if (!waitingRoll(epochAndState) || !unackedAppends.isEmpty()) {<a name="line.277"></a> +<span class="sourceLineNo">278</span> return false;<a name="line.278"></a> +<span class="sourceLineNo">279</span> }<a name="line.279"></a> +<span class="sourceLineNo">280</span> consumeLock.lock();<a name="line.280"></a> +<span class="sourceLineNo">281</span> try {<a name="line.281"></a> +<span class="sourceLineNo">282</span> // 1. a roll is requested<a name="line.282"></a> +<span class="sourceLineNo">283</span> // 2. all out-going entries have been acked(we have confirmed above).<a name="line.283"></a> +<span class="sourceLineNo">284</span> if (waitingRoll(epochAndState)) {<a name="line.284"></a> +<span class="sourceLineNo">285</span> readyForRolling = true;<a name="line.285"></a> +<span class="sourceLineNo">286</span> readyForRollingCond.signalAll();<a name="line.286"></a> +<span class="sourceLineNo">287</span> return true;<a name="line.287"></a> +<span class="sourceLineNo">288</span> } else {<a name="line.288"></a> +<span class="sourceLineNo">289</span> return false;<a name="line.289"></a> +<span class="sourceLineNo">290</span> }<a name="line.290"></a> +<span class="sourceLineNo">291</span> } finally {<a name="line.291"></a> +<span class="sourceLineNo">292</span> consumeLock.unlock();<a name="line.292"></a> +<span class="sourceLineNo">293</span> }<a name="line.293"></a> +<span class="sourceLineNo">294</span> }<a name="line.294"></a> +<span class="sourceLineNo">295</span><a name="line.295"></a> +<span class="sourceLineNo">296</span> private void syncFailed(long epochWhenSync, Throwable error) {<a name="line.296"></a> +<span class="sourceLineNo">297</span> LOG.warn("sync failed", error);<a name="line.297"></a> +<span class="sourceLineNo">298</span> boolean shouldRequestLogRoll = true;<a name="line.298"></a> +<span class="sourceLineNo">299</span> consumeLock.lock();<a name="line.299"></a> +<span class="sourceLineNo">300</span> try {<a name="line.300"></a> +<span class="sourceLineNo">301</span> int currentEpochAndState = epochAndState;<a name="line.301"></a> +<span class="sourceLineNo">302</span> if (epoch(currentEpochAndState) != epochWhenSync || writerBroken(currentEpochAndState)) {<a name="line.302"></a> +<span class="sourceLineNo">303</span> // this is not the previous writer which means we have already rolled the writer.<a name="line.303"></a> +<span class="sourceLineNo">304</span> // or this is still the current writer, but we have already marked it as broken and request<a name="line.304"></a> +<span class="sourceLineNo">305</span> // a roll.<a name="line.305"></a> +<span class="sourceLineNo">306</span> return;<a name="line.306"></a> +<span class="sourceLineNo">307</span> }<a name="line.307"></a> +<span class="sourceLineNo">308</span> this.epochAndState = currentEpochAndState | 0b10;<a name="line.308"></a> +<span class="sourceLineNo">309</span> if (waitingRoll(currentEpochAndState)) {<a name="line.309"></a> +<span class="sourceLineNo">310</span> readyForRolling = true;<a name="line.310"></a> +<span class="sourceLineNo">311</span> readyForRollingCond.signalAll();<a name="line.311"></a> +<span class="sourceLineNo">312</span> // this means we have already in the middle of a rollWriter so just tell the roller thread<a name="line.312"></a> +<span class="sourceLineNo">313</span> // that you can continue without requesting an extra log roll.<a name="line.313"></a> +<span class="sourceLineNo">314</span> shouldRequestLogRoll = false;<a name="line.314"></a> +<span class="sourceLineNo">315</span> }<a name="line.315"></a> +<span class="sourceLineNo">316</span> } finally {<a name="line.316"></a> +<span class="sourceLineNo">317</span> consumeLock.unlock();<a name="line.317"></a> +<span class="sourceLineNo">318</span> }<a name="line.318"></a> +<span class="sourceLineNo">319</span> for (Iterator<FSWALEntry> iter = unackedAppends.descendingIterator(); iter.hasNext();) {<a name="line.319"></a> +<span class="sourceLineNo">320</span> toWriteAppends.addFirst(iter.next());<a name="line.320"></a> +<span class="sourceLineNo">321</span> }<a name="line.321"></a> +<span class="sourceLineNo">322</span> highestUnsyncedTxid = highestSyncedTxid.get();<a name="line.322"></a> +<span class="sourceLineNo">323</span> if (shouldRequestLogRoll) {<a name="line.323"></a> +<span class="sourceLineNo">324</span> // request a roll.<a name="line.324"></a> +<span class="sourceLineNo">325</span> requestLogRoll();<a name="line.325"></a> +<span class="sourceLineNo">326</span> }<a name="line.326"></a> +<span class="sourceLineNo">327</span> }<a name="line.327"></a> +<span class="sourceLineNo">328</span><a name="line.328"></a> +<span class="sourceLineNo">329</span> private void syncCompleted(AsyncWriter writer, long processedTxid, long startTimeNs) {<a name="line.329"></a> +<span class="sourceLineNo">330</span> highestSyncedTxid.set(processedTxid);<a name="line.330"></a> +<span class="sourceLineNo">331</span> for (Iterator<FSWALEntry> iter = unackedAppends.iterator(); iter.hasNext();) {<a name="line.331"></a> +<span class="sourceLineNo">332</span> if (iter.next().getTxid() <= processedTxid) {<a name="line.332"></a> +<span class="sourceLineNo">333</span> iter.remove();<a name="line.333"></a> +<span class="sourceLineNo">334</span> } else {<a name="line.334"></a> +<span class="sourceLineNo">335</span> break;<a name="line.335"></a> +<span class="sourceLineNo">336</span> }<a name="line.336"></a> +<span class="sourceLineNo">337</span> }<a name="line.337"></a> +<span class="sourceLineNo">338</span> postSync(System.nanoTime() - startTimeNs, finishSync(true));<a 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error);<a name="line.359"></a> +<span class="sourceLineNo">360</span> } else {<a name="line.360"></a> +<span class="sourceLineNo">361</span> syncCompleted(writer, currentHighestProcessedAppendTxid, startTimeNs);<a name="line.361"></a> +<span class="sourceLineNo">362</span> }<a name="line.362"></a> +<span class="sourceLineNo">363</span> }, consumeExecutor);<a name="line.363"></a> <span class="sourceLineNo">364</span> }<a name="line.364"></a> <span class="sourceLineNo">365</span><a name="line.365"></a> -<span class="sourceLineNo">366</span> // try advancing the highestSyncedTxid as much as possible<a name="line.366"></a> -<span class="sourceLineNo">367</span> private int finishSync(boolean addSyncTrace) {<a name="line.367"></a> -<span class="sourceLineNo">368</span> if (unackedAppends.isEmpty()) {<a name="line.368"></a> -<span class="sourceLineNo">369</span> // All outstanding appends have been acked.<a name="line.369"></a> -<span class="sourceLineNo">370</span> if 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highestSyncedTxid.set(maxSyncTxid);<a name="line.380"></a> -<span class="sourceLineNo">381</span> int finished = syncFutures.size();<a name="line.381"></a> -<span class="sourceLineNo">382</span> syncFutures.clear();<a name="line.382"></a> -<span class="sourceLineNo">383</span> return finished;<a name="line.383"></a> -<span class="sourceLineNo">384</span> } else {<a name="line.384"></a> -<span class="sourceLineNo">385</span> // There is no append between highestProcessedAppendTxid and lowestUnprocessedAppendTxid, so<a name="line.385"></a> -<span class="sourceLineNo">386</span> // if highestSyncedTxid >= highestProcessedAppendTxid, then all syncs whose txid are between<a name="line.386"></a> -<span class="sourceLineNo">387</span> // highestProcessedAppendTxid and lowestUnprocessedAppendTxid can be finished.<a name="line.387"></a> -<span class="sourceLineNo">388</span> long lowestUnprocessedAppendTxid = toWriteAppends.peek().getTxid();<a name="line.388"></a> -<span 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iter.hasNext();) {<a name="line.434"></a> +<span class="sourceLineNo">435</span> FSWALEntry entry = iter.next();<a name="line.435"></a> +<span class="sourceLineNo">436</span> boolean appended;<a name="line.436"></a> +<span class="sourceLineNo">437</span> try {<a name="line.437"></a> +<span class="sourceLineNo">438</span> appended = append(writer, entry);<a name="line.438"></a> +<span class="sourceLineNo">439</span> } catch (IOException e) {<a name="line.439"></a> +<span class="sourceLineNo">440</span> throw new AssertionError("should not happen", e);<a name="line.440"></a> <span class="sourceLineNo">441</span> }<a name="line.441"></a> -<span class="sourceLineNo">442</span> }<a name="line.442"></a> -<span class="sourceLineNo">443</span> // if we have a newer transaction id, update it.<a name="line.443"></a> -<span class="sourceLineNo">444</span> // otherwise, use the previous transaction id.<a name="line.444"></a> -<span class="sourceLineNo">445</span> if (newHighestProcessedAppendTxid > 0) {<a name="line.445"></a> -<span class="sourceLineNo">446</span> highestProcessedAppendTxid = newHighestProcessedAppendTxid;<a name="line.446"></a> -<span class="sourceLineNo">447</span> } else {<a name="line.447"></a> -<span class="sourceLineNo">448</span> newHighestProcessedAppendTxid = highestProcessedAppendTxid;<a name="line.448"></a> -<span class="sourceLineNo">449</span> }<a name="line.449"></a> -<span class="sourceLineNo">450</span><a name="line.450"></a> -<span class="sourceLineNo">451</span> if (writer.getLength() - fileLengthAtLastSync >= batchSize) {<a name="line.451"></a> -<span class="sourceLineNo">452</span> // sync because buffer size limit.<a name="line.452"></a> -<span class="sourceLineNo">453</span> sync(writer);<a name="line.453"></a> -<span class="sourceLineNo">454</span> return;<a name="line.454"></a> -<span class="sourceLineNo">455</span> }<a name="line.455"></a> -<span class="sourceLineNo">456</span> if (writer.getLength() == fileLengthAtLastSync) {<a name="line.456"></a> -<span class="sourceLineNo">457</span> // we haven't written anything out, just advance the highestSyncedSequence since we may only<a name="line.457"></a> -<span class="sourceLineNo">458</span> // stamped some region sequence id.<a name="line.458"></a> -<span class="sourceLineNo">459</span> if (unackedAppends.isEmpty()) {<a name="line.459"></a> -<span class="sourceLineNo">460</span> highestSyncedTxid.set(highestProcessedAppendTxid);<a name="line.460"></a> -<span class="sourceLineNo">461</span> finishSync(false);<a name="line.461"></a> -<span class="sourceLineNo">462</span> trySetReadyForRolling();<a name="line.462"></a> -<span class="sourceLineNo">463</span> }<a name="line.463"></a> -<span class="sourceLineNo">464</span> return;<a name="line.464"></a> -<span class="sourceLineNo">465</span> }<a name="line.465"></a> -<span class="sourceLineNo">466</span> // reach here means that we have some unsynced data but haven't reached the batch size yet<a name="line.466"></a> -<span class="sourceLineNo">467</span> // but we will not issue a sync directly here even if there are sync requests because we may<a name="line.467"></a> -<span class="sourceLineNo">468</span> // have some new data in the ringbuffer, so let's just return here and delay the decision of<a name="line.468"></a> -<span class="sourceLineNo">469</span> // whether to issue a sync in the caller method.<a name="line.469"></a> -<span class="sourceLineNo">470</span> }<a name="line.470"></a> -<span class="sourceLineNo">471</span><a name="line
<TRUNCATED>
