http://git-wip-us.apache.org/repos/asf/hbase-site/blob/1ee65067/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncNonMetaRegionLocator.LocateRequest.html
----------------------------------------------------------------------
diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncNonMetaRegionLocator.LocateRequest.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncNonMetaRegionLocator.LocateRequest.html
index 63b8c53..88e70e2 100644
--- 
a/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncNonMetaRegionLocator.LocateRequest.html
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncNonMetaRegionLocator.LocateRequest.html
@@ -25,460 +25,470 @@
 <span class="sourceLineNo">017</span> */<a name="line.17"></a>
 <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.client;<a 
name="line.18"></a>
 <span class="sourceLineNo">019</span><a name="line.19"></a>
-<span class="sourceLineNo">020</span>import static 
org.apache.hadoop.hbase.HConstants.CATALOG_FAMILY;<a name="line.20"></a>
-<span class="sourceLineNo">021</span>import static 
org.apache.hadoop.hbase.HConstants.NINES;<a name="line.21"></a>
-<span class="sourceLineNo">022</span>import static 
org.apache.hadoop.hbase.HConstants.ZEROES;<a name="line.22"></a>
-<span class="sourceLineNo">023</span>import static 
org.apache.hadoop.hbase.TableName.META_TABLE_NAME;<a name="line.23"></a>
-<span class="sourceLineNo">024</span>import static 
org.apache.hadoop.hbase.client.ConnectionUtils.createClosestRowAfter;<a 
name="line.24"></a>
-<span class="sourceLineNo">025</span>import static 
org.apache.hadoop.hbase.client.ConnectionUtils.isEmptyStopRow;<a 
name="line.25"></a>
-<span class="sourceLineNo">026</span>import static 
org.apache.hadoop.hbase.client.RegionInfo.createRegionName;<a 
name="line.26"></a>
-<span class="sourceLineNo">027</span>import static 
org.apache.hadoop.hbase.util.Bytes.BYTES_COMPARATOR;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import static 
org.apache.hadoop.hbase.util.CollectionUtils.computeIfAbsent;<a 
name="line.28"></a>
-<span class="sourceLineNo">029</span><a name="line.29"></a>
-<span class="sourceLineNo">030</span>import java.io.IOException;<a 
name="line.30"></a>
-<span class="sourceLineNo">031</span>import java.util.Arrays;<a 
name="line.31"></a>
-<span class="sourceLineNo">032</span>import java.util.HashSet;<a 
name="line.32"></a>
-<span class="sourceLineNo">033</span>import java.util.Iterator;<a 
name="line.33"></a>
-<span class="sourceLineNo">034</span>import java.util.LinkedHashMap;<a 
name="line.34"></a>
-<span class="sourceLineNo">035</span>import java.util.List;<a 
name="line.35"></a>
-<span class="sourceLineNo">036</span>import java.util.Map;<a 
name="line.36"></a>
-<span class="sourceLineNo">037</span>import java.util.Optional;<a 
name="line.37"></a>
-<span class="sourceLineNo">038</span>import java.util.Set;<a 
name="line.38"></a>
-<span class="sourceLineNo">039</span>import 
java.util.concurrent.CompletableFuture;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import 
java.util.concurrent.ConcurrentHashMap;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import 
java.util.concurrent.ConcurrentMap;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import 
java.util.concurrent.ConcurrentNavigableMap;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import 
java.util.concurrent.ConcurrentSkipListMap;<a name="line.43"></a>
-<span class="sourceLineNo">044</span><a name="line.44"></a>
-<span class="sourceLineNo">045</span>import 
org.apache.hadoop.hbase.DoNotRetryIOException;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import 
org.apache.hadoop.hbase.HRegionLocation;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import 
org.apache.hadoop.hbase.MetaTableAccessor;<a name="line.47"></a>
-<span class="sourceLineNo">048</span>import 
org.apache.hadoop.hbase.RegionLocations;<a name="line.48"></a>
-<span class="sourceLineNo">049</span>import 
org.apache.hadoop.hbase.TableName;<a name="line.49"></a>
-<span class="sourceLineNo">050</span>import 
org.apache.hadoop.hbase.TableNotFoundException;<a name="line.50"></a>
-<span class="sourceLineNo">051</span>import 
org.apache.hadoop.hbase.util.Bytes;<a name="line.51"></a>
-<span class="sourceLineNo">052</span>import 
org.apache.yetus.audience.InterfaceAudience;<a name="line.52"></a>
-<span class="sourceLineNo">053</span>import org.slf4j.Logger;<a 
name="line.53"></a>
-<span class="sourceLineNo">054</span>import org.slf4j.LoggerFactory;<a 
name="line.54"></a>
-<span class="sourceLineNo">055</span><a name="line.55"></a>
-<span class="sourceLineNo">056</span>/**<a name="line.56"></a>
-<span class="sourceLineNo">057</span> * The asynchronous locator for regions 
other than meta.<a name="line.57"></a>
-<span class="sourceLineNo">058</span> */<a name="line.58"></a>
-<span class="sourceLineNo">059</span>@InterfaceAudience.Private<a 
name="line.59"></a>
-<span class="sourceLineNo">060</span>class AsyncNonMetaRegionLocator {<a 
name="line.60"></a>
-<span class="sourceLineNo">061</span><a name="line.61"></a>
-<span class="sourceLineNo">062</span>  private static final Logger LOG = 
LoggerFactory.getLogger(AsyncNonMetaRegionLocator.class);<a name="line.62"></a>
-<span class="sourceLineNo">063</span><a name="line.63"></a>
-<span class="sourceLineNo">064</span>  static final String 
MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE =<a name="line.64"></a>
-<span class="sourceLineNo">065</span>    
"hbase.client.meta.max.concurrent.locate.per.table";<a name="line.65"></a>
-<span class="sourceLineNo">066</span><a name="line.66"></a>
-<span class="sourceLineNo">067</span>  private static final int 
DEFAULT_MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE = 8;<a name="line.67"></a>
-<span class="sourceLineNo">068</span><a name="line.68"></a>
-<span class="sourceLineNo">069</span>  private final AsyncConnectionImpl 
conn;<a name="line.69"></a>
-<span class="sourceLineNo">070</span><a name="line.70"></a>
-<span class="sourceLineNo">071</span>  private final int 
maxConcurrentLocateRequestPerTable;<a name="line.71"></a>
-<span class="sourceLineNo">072</span><a name="line.72"></a>
-<span class="sourceLineNo">073</span>  private final 
ConcurrentMap&lt;TableName, TableCache&gt; cache = new 
ConcurrentHashMap&lt;&gt;();<a name="line.73"></a>
-<span class="sourceLineNo">074</span><a name="line.74"></a>
-<span class="sourceLineNo">075</span>  private static final class 
LocateRequest {<a name="line.75"></a>
-<span class="sourceLineNo">076</span><a name="line.76"></a>
-<span class="sourceLineNo">077</span>    public final byte[] row;<a 
name="line.77"></a>
-<span class="sourceLineNo">078</span><a name="line.78"></a>
-<span class="sourceLineNo">079</span>    public final RegionLocateType 
locateType;<a name="line.79"></a>
-<span class="sourceLineNo">080</span><a name="line.80"></a>
-<span class="sourceLineNo">081</span>    public LocateRequest(byte[] row, 
RegionLocateType locateType) {<a name="line.81"></a>
-<span class="sourceLineNo">082</span>      this.row = row;<a 
name="line.82"></a>
-<span class="sourceLineNo">083</span>      this.locateType = locateType;<a 
name="line.83"></a>
-<span class="sourceLineNo">084</span>    }<a name="line.84"></a>
-<span class="sourceLineNo">085</span><a name="line.85"></a>
-<span class="sourceLineNo">086</span>    @Override<a name="line.86"></a>
-<span class="sourceLineNo">087</span>    public int hashCode() {<a 
name="line.87"></a>
-<span class="sourceLineNo">088</span>      return Bytes.hashCode(row) ^ 
locateType.hashCode();<a name="line.88"></a>
-<span class="sourceLineNo">089</span>    }<a name="line.89"></a>
-<span class="sourceLineNo">090</span><a name="line.90"></a>
-<span class="sourceLineNo">091</span>    @Override<a name="line.91"></a>
-<span class="sourceLineNo">092</span>    public boolean equals(Object obj) {<a 
name="line.92"></a>
-<span class="sourceLineNo">093</span>      if (obj == null || obj.getClass() 
!= LocateRequest.class) {<a name="line.93"></a>
-<span class="sourceLineNo">094</span>        return false;<a 
name="line.94"></a>
-<span class="sourceLineNo">095</span>      }<a name="line.95"></a>
-<span class="sourceLineNo">096</span>      LocateRequest that = 
(LocateRequest) obj;<a name="line.96"></a>
-<span class="sourceLineNo">097</span>      return 
locateType.equals(that.locateType) &amp;&amp; Bytes.equals(row, that.row);<a 
name="line.97"></a>
-<span class="sourceLineNo">098</span>    }<a name="line.98"></a>
-<span class="sourceLineNo">099</span>  }<a name="line.99"></a>
-<span class="sourceLineNo">100</span><a name="line.100"></a>
-<span class="sourceLineNo">101</span>  private static final class TableCache 
{<a name="line.101"></a>
-<span class="sourceLineNo">102</span><a name="line.102"></a>
-<span class="sourceLineNo">103</span>    public final 
ConcurrentNavigableMap&lt;byte[], HRegionLocation&gt; cache =<a 
name="line.103"></a>
-<span class="sourceLineNo">104</span>      new 
ConcurrentSkipListMap&lt;&gt;(BYTES_COMPARATOR);<a name="line.104"></a>
-<span class="sourceLineNo">105</span><a name="line.105"></a>
-<span class="sourceLineNo">106</span>    public final Set&lt;LocateRequest&gt; 
pendingRequests = new HashSet&lt;&gt;();<a name="line.106"></a>
-<span class="sourceLineNo">107</span><a name="line.107"></a>
-<span class="sourceLineNo">108</span>    public final Map&lt;LocateRequest, 
CompletableFuture&lt;HRegionLocation&gt;&gt; allRequests =<a 
name="line.108"></a>
-<span class="sourceLineNo">109</span>      new LinkedHashMap&lt;&gt;();<a 
name="line.109"></a>
-<span class="sourceLineNo">110</span><a name="line.110"></a>
-<span class="sourceLineNo">111</span>    public boolean hasQuota(int max) {<a 
name="line.111"></a>
-<span class="sourceLineNo">112</span>      return pendingRequests.size() &lt; 
max;<a name="line.112"></a>
-<span class="sourceLineNo">113</span>    }<a name="line.113"></a>
-<span class="sourceLineNo">114</span><a name="line.114"></a>
-<span class="sourceLineNo">115</span>    public boolean 
isPending(LocateRequest req) {<a name="line.115"></a>
-<span class="sourceLineNo">116</span>      return 
pendingRequests.contains(req);<a name="line.116"></a>
-<span class="sourceLineNo">117</span>    }<a name="line.117"></a>
-<span class="sourceLineNo">118</span><a name="line.118"></a>
-<span class="sourceLineNo">119</span>    public void send(LocateRequest req) 
{<a name="line.119"></a>
-<span class="sourceLineNo">120</span>      pendingRequests.add(req);<a 
name="line.120"></a>
-<span class="sourceLineNo">121</span>    }<a name="line.121"></a>
-<span class="sourceLineNo">122</span><a name="line.122"></a>
-<span class="sourceLineNo">123</span>    public Optional&lt;LocateRequest&gt; 
getCandidate() {<a name="line.123"></a>
-<span class="sourceLineNo">124</span>      return 
allRequests.keySet().stream().filter(r -&gt; !isPending(r)).findFirst();<a 
name="line.124"></a>
-<span class="sourceLineNo">125</span>    }<a name="line.125"></a>
-<span class="sourceLineNo">126</span><a name="line.126"></a>
-<span class="sourceLineNo">127</span>    public void 
clearCompletedRequests(Optional&lt;HRegionLocation&gt; location) {<a 
name="line.127"></a>
-<span class="sourceLineNo">128</span>      for 
(Iterator&lt;Map.Entry&lt;LocateRequest, 
CompletableFuture&lt;HRegionLocation&gt;&gt;&gt; iter =<a name="line.128"></a>
-<span class="sourceLineNo">129</span>        
allRequests.entrySet().iterator(); iter.hasNext();) {<a name="line.129"></a>
-<span class="sourceLineNo">130</span>        Map.Entry&lt;LocateRequest, 
CompletableFuture&lt;HRegionLocation&gt;&gt; entry = iter.next();<a 
name="line.130"></a>
-<span class="sourceLineNo">131</span>        if (tryComplete(entry.getKey(), 
entry.getValue(), location)) {<a name="line.131"></a>
-<span class="sourceLineNo">132</span>          iter.remove();<a 
name="line.132"></a>
-<span class="sourceLineNo">133</span>        }<a name="line.133"></a>
-<span class="sourceLineNo">134</span>      }<a name="line.134"></a>
-<span class="sourceLineNo">135</span>    }<a name="line.135"></a>
-<span class="sourceLineNo">136</span><a name="line.136"></a>
-<span class="sourceLineNo">137</span>    private boolean 
tryComplete(LocateRequest req, CompletableFuture&lt;HRegionLocation&gt; 
future,<a name="line.137"></a>
-<span class="sourceLineNo">138</span>        Optional&lt;HRegionLocation&gt; 
location) {<a name="line.138"></a>
-<span class="sourceLineNo">139</span>      if (future.isDone()) {<a 
name="line.139"></a>
-<span class="sourceLineNo">140</span>        return true;<a 
name="line.140"></a>
-<span class="sourceLineNo">141</span>      }<a name="line.141"></a>
-<span class="sourceLineNo">142</span>      if (!location.isPresent()) {<a 
name="line.142"></a>
-<span class="sourceLineNo">143</span>        return false;<a 
name="line.143"></a>
-<span class="sourceLineNo">144</span>      }<a name="line.144"></a>
-<span class="sourceLineNo">145</span>      HRegionLocation loc = 
location.get();<a name="line.145"></a>
-<span class="sourceLineNo">146</span>      boolean completed;<a 
name="line.146"></a>
-<span class="sourceLineNo">147</span>      if 
(req.locateType.equals(RegionLocateType.BEFORE)) {<a name="line.147"></a>
-<span class="sourceLineNo">148</span>        // for locating the row before 
current row, the common case is to find the previous region<a 
name="line.148"></a>
-<span class="sourceLineNo">149</span>        // in reverse scan, so we check 
the endKey first. In general, the condition should be<a name="line.149"></a>
-<span class="sourceLineNo">150</span>        // startKey &lt; req.row and 
endKey &gt;= req.row. Here we split it to endKey == req.row ||<a 
name="line.150"></a>
-<span class="sourceLineNo">151</span>        // (endKey &gt; req.row 
&amp;&amp; startKey &lt; req.row). The two conditions are equal since startKey 
&lt;<a name="line.151"></a>
-<span class="sourceLineNo">152</span>        // endKey.<a name="line.152"></a>
-<span class="sourceLineNo">153</span>        int c = 
Bytes.compareTo(loc.getRegion().getEndKey(), req.row);<a name="line.153"></a>
-<span class="sourceLineNo">154</span>        completed =<a name="line.154"></a>
-<span class="sourceLineNo">155</span>          c == 0 || (c &gt; 0 &amp;&amp; 
Bytes.compareTo(loc.getRegion().getStartKey(), req.row) &lt; 0);<a 
name="line.155"></a>
-<span class="sourceLineNo">156</span>      } else {<a name="line.156"></a>
-<span class="sourceLineNo">157</span>        completed = 
loc.getRegion().containsRow(req.row);<a name="line.157"></a>
-<span class="sourceLineNo">158</span>      }<a name="line.158"></a>
-<span class="sourceLineNo">159</span>      if (completed) {<a 
name="line.159"></a>
-<span class="sourceLineNo">160</span>        future.complete(loc);<a 
name="line.160"></a>
-<span class="sourceLineNo">161</span>        return true;<a 
name="line.161"></a>
-<span class="sourceLineNo">162</span>      } else {<a name="line.162"></a>
-<span class="sourceLineNo">163</span>        return false;<a 
name="line.163"></a>
-<span class="sourceLineNo">164</span>      }<a name="line.164"></a>
-<span class="sourceLineNo">165</span>    }<a name="line.165"></a>
-<span class="sourceLineNo">166</span>  }<a name="line.166"></a>
-<span class="sourceLineNo">167</span><a name="line.167"></a>
-<span class="sourceLineNo">168</span>  
AsyncNonMetaRegionLocator(AsyncConnectionImpl conn) {<a name="line.168"></a>
-<span class="sourceLineNo">169</span>    this.conn = conn;<a 
name="line.169"></a>
-<span class="sourceLineNo">170</span>    
this.maxConcurrentLocateRequestPerTable = conn.getConfiguration().getInt(<a 
name="line.170"></a>
-<span class="sourceLineNo">171</span>      
MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE, 
DEFAULT_MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE);<a name="line.171"></a>
-<span class="sourceLineNo">172</span>  }<a name="line.172"></a>
-<span class="sourceLineNo">173</span><a name="line.173"></a>
-<span class="sourceLineNo">174</span>  private TableCache 
getTableCache(TableName tableName) {<a name="line.174"></a>
-<span class="sourceLineNo">175</span>    return computeIfAbsent(cache, 
tableName, TableCache::new);<a name="line.175"></a>
-<span class="sourceLineNo">176</span>  }<a name="line.176"></a>
-<span class="sourceLineNo">177</span><a name="line.177"></a>
-<span class="sourceLineNo">178</span>  private void 
removeFromCache(HRegionLocation loc) {<a name="line.178"></a>
-<span class="sourceLineNo">179</span>    TableCache tableCache = 
cache.get(loc.getRegion().getTable());<a name="line.179"></a>
-<span class="sourceLineNo">180</span>    if (tableCache == null) {<a 
name="line.180"></a>
-<span class="sourceLineNo">181</span>      return;<a name="line.181"></a>
-<span class="sourceLineNo">182</span>    }<a name="line.182"></a>
-<span class="sourceLineNo">183</span>    
tableCache.cache.computeIfPresent(loc.getRegion().getStartKey(), (k, oldLoc) 
-&gt; {<a name="line.183"></a>
-<span class="sourceLineNo">184</span>      if (oldLoc.getSeqNum() &gt; 
loc.getSeqNum() ||<a name="line.184"></a>
-<span class="sourceLineNo">185</span>        
!oldLoc.getServerName().equals(loc.getServerName())) {<a name="line.185"></a>
-<span class="sourceLineNo">186</span>        return oldLoc;<a 
name="line.186"></a>
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-<span class="sourceLineNo">188</span>      return null;<a name="line.188"></a>
-<span class="sourceLineNo">189</span>    });<a name="line.189"></a>
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-<span class="sourceLineNo">191</span><a name="line.191"></a>
-<span class="sourceLineNo">192</span>  // return whether we add this loc to 
cache<a name="line.192"></a>
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tableCache, HRegionLocation loc) {<a name="line.193"></a>
-<span class="sourceLineNo">194</span>    if (LOG.isTraceEnabled()) {<a 
name="line.194"></a>
-<span class="sourceLineNo">195</span>      LOG.trace("Try adding " + loc + " 
to cache");<a name="line.195"></a>
-<span class="sourceLineNo">196</span>    }<a name="line.196"></a>
-<span class="sourceLineNo">197</span>    byte[] startKey = 
loc.getRegion().getStartKey();<a name="line.197"></a>
-<span class="sourceLineNo">198</span>    HRegionLocation oldLoc = 
tableCache.cache.putIfAbsent(startKey, loc);<a name="line.198"></a>
-<span class="sourceLineNo">199</span>    if (oldLoc == null) {<a 
name="line.199"></a>
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-<span class="sourceLineNo">202</span>    if (oldLoc.getSeqNum() &gt; 
loc.getSeqNum() ||<a name="line.202"></a>
-<span class="sourceLineNo">203</span>      
oldLoc.getServerName().equals(loc.getServerName())) {<a name="line.203"></a>
-<span class="sourceLineNo">204</span>      if (LOG.isTraceEnabled()) {<a 
name="line.204"></a>
-<span class="sourceLineNo">205</span>        LOG.trace("Will not add " + loc + 
" to cache because the old value " + oldLoc +<a name="line.205"></a>
-<span class="sourceLineNo">206</span>          " is newer than us or has the 
same server name");<a name="line.206"></a>
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-<span class="sourceLineNo">209</span>    }<a name="line.209"></a>
-<span class="sourceLineNo">210</span>    return loc == 
tableCache.cache.compute(startKey, (k, oldValue) -&gt; {<a name="line.210"></a>
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oldValue.getSeqNum() &lt;= loc.getSeqNum()) {<a name="line.211"></a>
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-<span class="sourceLineNo">213</span>      }<a name="line.213"></a>
-<span class="sourceLineNo">214</span>      if (LOG.isTraceEnabled()) {<a 
name="line.214"></a>
-<span class="sourceLineNo">215</span>        LOG.trace("Will not add " + loc + 
" to cache because the old value " + oldValue +<a name="line.215"></a>
-<span class="sourceLineNo">216</span>          " is newer than us or has the 
same server name." +<a name="line.216"></a>
-<span class="sourceLineNo">217</span>          " Maybe it is updated before we 
replace it");<a name="line.217"></a>
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-<span class="sourceLineNo">219</span>      return oldValue;<a 
name="line.219"></a>
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-<span class="sourceLineNo">223</span>  
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value = 
"UPM_UNCALLED_PRIVATE_METHOD",<a name="line.223"></a>
-<span class="sourceLineNo">224</span>      justification = "Called by lambda 
expression")<a name="line.224"></a>
-<span class="sourceLineNo">225</span>  private void addToCache(HRegionLocation 
loc) {<a name="line.225"></a>
-<span class="sourceLineNo">226</span>    
addToCache(getTableCache(loc.getRegion().getTable()), loc);<a 
name="line.226"></a>
-<span class="sourceLineNo">227</span>    if (LOG.isTraceEnabled()) {<a 
name="line.227"></a>
-<span class="sourceLineNo">228</span>      LOG.trace("Try adding " + loc + " 
to cache");<a name="line.228"></a>
-<span class="sourceLineNo">229</span>    }<a name="line.229"></a>
-<span class="sourceLineNo">230</span>  }<a name="line.230"></a>
-<span class="sourceLineNo">231</span><a name="line.231"></a>
-<span class="sourceLineNo">232</span>  private void complete(TableName 
tableName, LocateRequest req, HRegionLocation loc,<a name="line.232"></a>
-<span class="sourceLineNo">233</span>      Throwable error) {<a 
name="line.233"></a>
-<span class="sourceLineNo">234</span>    if (error != null) {<a 
name="line.234"></a>
-<span class="sourceLineNo">235</span>      LOG.warn("Failed to locate region 
in '" + tableName + "', row='" +<a name="line.235"></a>
-<span class="sourceLineNo">236</span>        Bytes.toStringBinary(req.row) + 
"', locateType=" + req.locateType, error);<a name="line.236"></a>
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= Optional.empty();<a name="line.238"></a>
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getTableCache(tableName);<a name="line.239"></a>
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{<a name="line.241"></a>
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tableCache.pendingRequests.remove(req);<a name="line.244"></a>
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tableCache.clearCompletedRequests(Optional.empty());<a name="line.245"></a>
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request in a synchronized block, so the table cache must have<a 
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request.<a name="line.247"></a>
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tableCache.getCandidate();<a name="line.248"></a>
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tableCache.send(r));<a name="line.249"></a>
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locateInMeta(tableName, r));<a name="line.251"></a>
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tableCache.pendingRequests.remove(req);<a name="line.256"></a>
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DoNotRetryIOException) {<a name="line.257"></a>
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= tableCache.allRequests.remove(req);<a name="line.258"></a>
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name="line.259"></a>
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future.completeExceptionally(error);<a name="line.260"></a>
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tableCache.clearCompletedRequests(Optional.ofNullable(loc));<a 
name="line.263"></a>
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in a synchronized block, so the table cache must have<a name="line.264"></a>
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request.<a name="line.265"></a>
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tableCache.getCandidate();<a name="line.266"></a>
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tableCache.send(r));<a name="line.267"></a>
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locateInMeta(tableName, r));<a name="line.269"></a>
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-<span class="sourceLineNo">271</span><a name="line.271"></a>
-<span class="sourceLineNo">272</span>  private void onScanComplete(TableName 
tableName, LocateRequest req, List&lt;Result&gt; results,<a name="line.272"></a>
+<span class="sourceLineNo">020</span>import static 
org.apache.hadoop.hbase.HConstants.NINES;<a name="line.20"></a>
+<span class="sourceLineNo">021</span>import static 
org.apache.hadoop.hbase.HConstants.ZEROES;<a name="line.21"></a>
+<span class="sourceLineNo">022</span>import static 
org.apache.hadoop.hbase.TableName.META_TABLE_NAME;<a name="line.22"></a>
+<span class="sourceLineNo">023</span>import static 
org.apache.hadoop.hbase.client.ConnectionUtils.createClosestRowAfter;<a 
name="line.23"></a>
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org.apache.hadoop.hbase.client.ConnectionUtils.isEmptyStopRow;<a 
name="line.24"></a>
+<span class="sourceLineNo">025</span>import static 
org.apache.hadoop.hbase.client.RegionInfo.createRegionName;<a 
name="line.25"></a>
+<span class="sourceLineNo">026</span>import static 
org.apache.hadoop.hbase.util.Bytes.BYTES_COMPARATOR;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import static 
org.apache.hadoop.hbase.util.CollectionUtils.computeIfAbsent;<a 
name="line.27"></a>
+<span class="sourceLineNo">028</span><a name="line.28"></a>
+<span class="sourceLineNo">029</span>import java.io.IOException;<a 
name="line.29"></a>
+<span class="sourceLineNo">030</span>import java.util.Arrays;<a 
name="line.30"></a>
+<span class="sourceLineNo">031</span>import java.util.HashSet;<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.LinkedHashMap;<a 
name="line.33"></a>
+<span class="sourceLineNo">034</span>import java.util.Map;<a 
name="line.34"></a>
+<span class="sourceLineNo">035</span>import java.util.Optional;<a 
name="line.35"></a>
+<span class="sourceLineNo">036</span>import java.util.Set;<a 
name="line.36"></a>
+<span class="sourceLineNo">037</span>import 
java.util.concurrent.CompletableFuture;<a name="line.37"></a>
+<span class="sourceLineNo">038</span>import 
java.util.concurrent.ConcurrentHashMap;<a name="line.38"></a>
+<span class="sourceLineNo">039</span>import 
java.util.concurrent.ConcurrentMap;<a name="line.39"></a>
+<span class="sourceLineNo">040</span>import 
java.util.concurrent.ConcurrentNavigableMap;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import 
java.util.concurrent.ConcurrentSkipListMap;<a name="line.41"></a>
+<span class="sourceLineNo">042</span>import 
org.apache.hadoop.hbase.DoNotRetryIOException;<a name="line.42"></a>
+<span class="sourceLineNo">043</span>import 
org.apache.hadoop.hbase.HConstants;<a name="line.43"></a>
+<span class="sourceLineNo">044</span>import 
org.apache.hadoop.hbase.HRegionLocation;<a name="line.44"></a>
+<span class="sourceLineNo">045</span>import 
org.apache.hadoop.hbase.MetaTableAccessor;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import 
org.apache.hadoop.hbase.RegionLocations;<a name="line.46"></a>
+<span class="sourceLineNo">047</span>import 
org.apache.hadoop.hbase.TableName;<a name="line.47"></a>
+<span class="sourceLineNo">048</span>import 
org.apache.hadoop.hbase.TableNotFoundException;<a name="line.48"></a>
+<span class="sourceLineNo">049</span>import 
org.apache.hadoop.hbase.client.Scan.ReadType;<a name="line.49"></a>
+<span class="sourceLineNo">050</span>import 
org.apache.hadoop.hbase.util.Bytes;<a name="line.50"></a>
+<span class="sourceLineNo">051</span>import 
org.apache.yetus.audience.InterfaceAudience;<a name="line.51"></a>
+<span class="sourceLineNo">052</span>import org.slf4j.Logger;<a 
name="line.52"></a>
+<span class="sourceLineNo">053</span>import org.slf4j.LoggerFactory;<a 
name="line.53"></a>
+<span class="sourceLineNo">054</span><a name="line.54"></a>
+<span class="sourceLineNo">055</span>/**<a name="line.55"></a>
+<span class="sourceLineNo">056</span> * The asynchronous locator for regions 
other than meta.<a name="line.56"></a>
+<span class="sourceLineNo">057</span> */<a name="line.57"></a>
+<span class="sourceLineNo">058</span>@InterfaceAudience.Private<a 
name="line.58"></a>
+<span class="sourceLineNo">059</span>class AsyncNonMetaRegionLocator {<a 
name="line.59"></a>
+<span class="sourceLineNo">060</span><a name="line.60"></a>
+<span class="sourceLineNo">061</span>  private static final Logger LOG = 
LoggerFactory.getLogger(AsyncNonMetaRegionLocator.class);<a name="line.61"></a>
+<span class="sourceLineNo">062</span><a name="line.62"></a>
+<span class="sourceLineNo">063</span>  static final String 
MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE =<a name="line.63"></a>
+<span class="sourceLineNo">064</span>    
"hbase.client.meta.max.concurrent.locate.per.table";<a name="line.64"></a>
+<span class="sourceLineNo">065</span><a name="line.65"></a>
+<span class="sourceLineNo">066</span>  private static final int 
DEFAULT_MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE = 8;<a name="line.66"></a>
+<span class="sourceLineNo">067</span><a name="line.67"></a>
+<span class="sourceLineNo">068</span>  private final AsyncConnectionImpl 
conn;<a name="line.68"></a>
+<span class="sourceLineNo">069</span><a name="line.69"></a>
+<span class="sourceLineNo">070</span>  private final int 
maxConcurrentLocateRequestPerTable;<a name="line.70"></a>
+<span class="sourceLineNo">071</span><a name="line.71"></a>
+<span class="sourceLineNo">072</span>  private final 
ConcurrentMap&lt;TableName, TableCache&gt; cache = new 
ConcurrentHashMap&lt;&gt;();<a name="line.72"></a>
+<span class="sourceLineNo">073</span><a name="line.73"></a>
+<span class="sourceLineNo">074</span>  private static final class 
LocateRequest {<a name="line.74"></a>
+<span class="sourceLineNo">075</span><a name="line.75"></a>
+<span class="sourceLineNo">076</span>    public final byte[] row;<a 
name="line.76"></a>
+<span class="sourceLineNo">077</span><a name="line.77"></a>
+<span class="sourceLineNo">078</span>    public final RegionLocateType 
locateType;<a name="line.78"></a>
+<span class="sourceLineNo">079</span><a name="line.79"></a>
+<span class="sourceLineNo">080</span>    public LocateRequest(byte[] row, 
RegionLocateType locateType) {<a name="line.80"></a>
+<span class="sourceLineNo">081</span>      this.row = row;<a 
name="line.81"></a>
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name="line.82"></a>
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+<span class="sourceLineNo">084</span><a name="line.84"></a>
+<span class="sourceLineNo">085</span>    @Override<a name="line.85"></a>
+<span class="sourceLineNo">086</span>    public int hashCode() {<a 
name="line.86"></a>
+<span class="sourceLineNo">087</span>      return Bytes.hashCode(row) ^ 
locateType.hashCode();<a name="line.87"></a>
+<span class="sourceLineNo">088</span>    }<a name="line.88"></a>
+<span class="sourceLineNo">089</span><a name="line.89"></a>
+<span class="sourceLineNo">090</span>    @Override<a name="line.90"></a>
+<span class="sourceLineNo">091</span>    public boolean equals(Object obj) {<a 
name="line.91"></a>
+<span class="sourceLineNo">092</span>      if (obj == null || obj.getClass() 
!= LocateRequest.class) {<a name="line.92"></a>
+<span class="sourceLineNo">093</span>        return false;<a 
name="line.93"></a>
+<span class="sourceLineNo">094</span>      }<a name="line.94"></a>
+<span class="sourceLineNo">095</span>      LocateRequest that = 
(LocateRequest) obj;<a name="line.95"></a>
+<span class="sourceLineNo">096</span>      return 
locateType.equals(that.locateType) &amp;&amp; Bytes.equals(row, that.row);<a 
name="line.96"></a>
+<span class="sourceLineNo">097</span>    }<a name="line.97"></a>
+<span class="sourceLineNo">098</span>  }<a name="line.98"></a>
+<span class="sourceLineNo">099</span><a name="line.99"></a>
+<span class="sourceLineNo">100</span>  private static final class TableCache 
{<a name="line.100"></a>
+<span class="sourceLineNo">101</span><a name="line.101"></a>
+<span class="sourceLineNo">102</span>    public final 
ConcurrentNavigableMap&lt;byte[], HRegionLocation&gt; cache =<a 
name="line.102"></a>
+<span class="sourceLineNo">103</span>      new 
ConcurrentSkipListMap&lt;&gt;(BYTES_COMPARATOR);<a name="line.103"></a>
+<span class="sourceLineNo">104</span><a name="line.104"></a>
+<span class="sourceLineNo">105</span>    public final Set&lt;LocateRequest&gt; 
pendingRequests = new HashSet&lt;&gt;();<a name="line.105"></a>
+<span class="sourceLineNo">106</span><a name="line.106"></a>
+<span class="sourceLineNo">107</span>    public final Map&lt;LocateRequest, 
CompletableFuture&lt;HRegionLocation&gt;&gt; allRequests =<a 
name="line.107"></a>
+<span class="sourceLineNo">108</span>      new LinkedHashMap&lt;&gt;();<a 
name="line.108"></a>
+<span class="sourceLineNo">109</span><a name="line.109"></a>
+<span class="sourceLineNo">110</span>    public boolean hasQuota(int max) {<a 
name="line.110"></a>
+<span class="sourceLineNo">111</span>      return pendingRequests.size() &lt; 
max;<a name="line.111"></a>
+<span class="sourceLineNo">112</span>    }<a name="line.112"></a>
+<span class="sourceLineNo">113</span><a name="line.113"></a>
+<span class="sourceLineNo">114</span>    public boolean 
isPending(LocateRequest req) {<a name="line.114"></a>
+<span class="sourceLineNo">115</span>      return 
pendingRequests.contains(req);<a name="line.115"></a>
+<span class="sourceLineNo">116</span>    }<a name="line.116"></a>
+<span class="sourceLineNo">117</span><a name="line.117"></a>
+<span class="sourceLineNo">118</span>    public void send(LocateRequest req) 
{<a name="line.118"></a>
+<span class="sourceLineNo">119</span>      pendingRequests.add(req);<a 
name="line.119"></a>
+<span class="sourceLineNo">120</span>    }<a name="line.120"></a>
+<span class="sourceLineNo">121</span><a name="line.121"></a>
+<span class="sourceLineNo">122</span>    public Optional&lt;LocateRequest&gt; 
getCandidate() {<a name="line.122"></a>
+<span class="sourceLineNo">123</span>      return 
allRequests.keySet().stream().filter(r -&gt; !isPending(r)).findFirst();<a 
name="line.123"></a>
+<span class="sourceLineNo">124</span>    }<a name="line.124"></a>
+<span class="sourceLineNo">125</span><a name="line.125"></a>
+<span class="sourceLineNo">126</span>    public void 
clearCompletedRequests(Optional&lt;HRegionLocation&gt; location) {<a 
name="line.126"></a>
+<span class="sourceLineNo">127</span>      for 
(Iterator&lt;Map.Entry&lt;LocateRequest, 
CompletableFuture&lt;HRegionLocation&gt;&gt;&gt; iter =<a name="line.127"></a>
+<span class="sourceLineNo">128</span>        
allRequests.entrySet().iterator(); iter.hasNext();) {<a name="line.128"></a>
+<span class="sourceLineNo">129</span>        Map.Entry&lt;LocateRequest, 
CompletableFuture&lt;HRegionLocation&gt;&gt; entry = iter.next();<a 
name="line.129"></a>
+<span class="sourceLineNo">130</span>        if (tryComplete(entry.getKey(), 
entry.getValue(), location)) {<a name="line.130"></a>
+<span class="sourceLineNo">131</span>          iter.remove();<a 
name="line.131"></a>
+<span class="sourceLineNo">132</span>        }<a name="line.132"></a>
+<span class="sourceLineNo">133</span>      }<a name="line.133"></a>
+<span class="sourceLineNo">134</span>    }<a name="line.134"></a>
+<span class="sourceLineNo">135</span><a name="line.135"></a>
+<span class="sourceLineNo">136</span>    private boolean 
tryComplete(LocateRequest req, CompletableFuture&lt;HRegionLocation&gt; 
future,<a name="line.136"></a>
+<span class="sourceLineNo">137</span>        Optional&lt;HRegionLocation&gt; 
location) {<a name="line.137"></a>
+<span class="sourceLineNo">138</span>      if (future.isDone()) {<a 
name="line.138"></a>
+<span class="sourceLineNo">139</span>        return true;<a 
name="line.139"></a>
+<span class="sourceLineNo">140</span>      }<a name="line.140"></a>
+<span class="sourceLineNo">141</span>      if (!location.isPresent()) {<a 
name="line.141"></a>
+<span class="sourceLineNo">142</span>        return false;<a 
name="line.142"></a>
+<span class="sourceLineNo">143</span>      }<a name="line.143"></a>
+<span class="sourceLineNo">144</span>      HRegionLocation loc = 
location.get();<a name="line.144"></a>
+<span class="sourceLineNo">145</span>      boolean completed;<a 
name="line.145"></a>
+<span class="sourceLineNo">146</span>      if 
(req.locateType.equals(RegionLocateType.BEFORE)) {<a name="line.146"></a>
+<span class="sourceLineNo">147</span>        // for locating the row before 
current row, the common case is to find the previous region<a 
name="line.147"></a>
+<span class="sourceLineNo">148</span>        // in reverse scan, so we check 
the endKey first. In general, the condition should be<a name="line.148"></a>
+<span class="sourceLineNo">149</span>        // startKey &lt; req.row and 
endKey &gt;= req.row. Here we split it to endKey == req.row ||<a 
name="line.149"></a>
+<span class="sourceLineNo">150</span>        // (endKey &gt; req.row 
&amp;&amp; startKey &lt; req.row). The two conditions are equal since startKey 
&lt;<a name="line.150"></a>
+<span class="sourceLineNo">151</span>        // endKey.<a name="line.151"></a>
+<span class="sourceLineNo">152</span>        int c = 
Bytes.compareTo(loc.getRegion().getEndKey(), req.row);<a name="line.152"></a>
+<span class="sourceLineNo">153</span>        completed =<a name="line.153"></a>
+<span class="sourceLineNo">154</span>          c == 0 || (c &gt; 0 &amp;&amp; 
Bytes.compareTo(loc.getRegion().getStartKey(), req.row) &lt; 0);<a 
name="line.154"></a>
+<span class="sourceLineNo">155</span>      } else {<a name="line.155"></a>
+<span class="sourceLineNo">156</span>        completed = 
loc.getRegion().containsRow(req.row);<a name="line.156"></a>
+<span class="sourceLineNo">157</span>      }<a name="line.157"></a>
+<span class="sourceLineNo">158</span>      if (completed) {<a 
name="line.158"></a>
+<span class="sourceLineNo">159</span>        future.complete(loc);<a 
name="line.159"></a>
+<span class="sourceLineNo">160</span>        return true;<a 
name="line.160"></a>
+<span class="sourceLineNo">161</span>      } else {<a name="line.161"></a>
+<span class="sourceLineNo">162</span>        return false;<a 
name="line.162"></a>
+<span class="sourceLineNo">163</span>      }<a name="line.163"></a>
+<span class="sourceLineNo">164</span>    }<a name="line.164"></a>
+<span class="sourceLineNo">165</span>  }<a name="line.165"></a>
+<span class="sourceLineNo">166</span><a name="line.166"></a>
+<span class="sourceLineNo">167</span>  
AsyncNonMetaRegionLocator(AsyncConnectionImpl conn) {<a name="line.167"></a>
+<span class="sourceLineNo">168</span>    this.conn = conn;<a 
name="line.168"></a>
+<span class="sourceLineNo">169</span>    
this.maxConcurrentLocateRequestPerTable = conn.getConfiguration().getInt(<a 
name="line.169"></a>
+<span class="sourceLineNo">170</span>      
MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE, 
DEFAULT_MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE);<a name="line.170"></a>
+<span class="sourceLineNo">171</span>  }<a name="line.171"></a>
+<span class="sourceLineNo">172</span><a name="line.172"></a>
+<span class="sourceLineNo">173</span>  private TableCache 
getTableCache(TableName tableName) {<a name="line.173"></a>
+<span class="sourceLineNo">174</span>    return computeIfAbsent(cache, 
tableName, TableCache::new);<a name="line.174"></a>
+<span class="sourceLineNo">175</span>  }<a name="line.175"></a>
+<span class="sourceLineNo">176</span><a name="line.176"></a>
+<span class="sourceLineNo">177</span>  private void 
removeFromCache(HRegionLocation loc) {<a name="line.177"></a>
+<span class="sourceLineNo">178</span>    TableCache tableCache = 
cache.get(loc.getRegion().getTable());<a name="line.178"></a>
+<span class="sourceLineNo">179</span>    if (tableCache == null) {<a 
name="line.179"></a>
+<span class="sourceLineNo">180</span>      return;<a name="line.180"></a>
+<span class="sourceLineNo">181</span>    }<a name="line.181"></a>
+<span class="sourceLineNo">182</span>    
tableCache.cache.computeIfPresent(loc.getRegion().getStartKey(), (k, oldLoc) 
-&gt; {<a name="line.182"></a>
+<span class="sourceLineNo">183</span>      if (oldLoc.getSeqNum() &gt; 
loc.getSeqNum() ||<a name="line.183"></a>
+<span class="sourceLineNo">184</span>        
!oldLoc.getServerName().equals(loc.getServerName())) {<a name="line.184"></a>
+<span class="sourceLineNo">185</span>        return oldLoc;<a 
name="line.185"></a>
+<span class="sourceLineNo">186</span>      }<a name="line.186"></a>
+<span class="sourceLineNo">187</span>      return null;<a name="line.187"></a>
+<span class="sourceLineNo">188</span>    });<a name="line.188"></a>
+<span class="sourceLineNo">189</span>  }<a name="line.189"></a>
+<span class="sourceLineNo">190</span><a name="line.190"></a>
+<span class="sourceLineNo">191</span>  // return whether we add this loc to 
cache<a name="line.191"></a>
+<span class="sourceLineNo">192</span>  private boolean addToCache(TableCache 
tableCache, HRegionLocation loc) {<a name="line.192"></a>
+<span class="sourceLineNo">193</span>    if (LOG.isTraceEnabled()) {<a 
name="line.193"></a>
+<span class="sourceLineNo">194</span>      LOG.trace("Try adding " + loc + " 
to cache");<a name="line.194"></a>
+<span class="sourceLineNo">195</span>    }<a name="line.195"></a>
+<span class="sourceLineNo">196</span>    byte[] startKey = 
loc.getRegion().getStartKey();<a name="line.196"></a>
+<span class="sourceLineNo">197</span>    HRegionLocation oldLoc = 
tableCache.cache.putIfAbsent(startKey, loc);<a name="line.197"></a>
+<span class="sourceLineNo">198</span>    if (oldLoc == null) {<a 
name="line.198"></a>
+<span class="sourceLineNo">199</span>      return true;<a name="line.199"></a>
+<span class="sourceLineNo">200</span>    }<a name="line.200"></a>
+<span class="sourceLineNo">201</span>    if (oldLoc.getSeqNum() &gt; 
loc.getSeqNum() ||<a name="line.201"></a>
+<span class="sourceLineNo">202</span>      
oldLoc.getServerName().equals(loc.getServerName())) {<a name="line.202"></a>
+<span class="sourceLineNo">203</span>      if (LOG.isTraceEnabled()) {<a 
name="line.203"></a>
+<span class="sourceLineNo">204</span>        LOG.trace("Will not add " + loc + 
" to cache because the old value " + oldLoc +<a name="line.204"></a>
+<span class="sourceLineNo">205</span>          " is newer than us or has the 
same server name");<a name="line.205"></a>
+<span class="sourceLineNo">206</span>      }<a name="line.206"></a>
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tableCache.clearCompletedRequests(Optional.empty());<a name="line.244"></a>
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tableCache.clearCompletedRequests(Optional.ofNullable(loc));<a 
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scan<a name="line.271"></a>
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req.locateType, locs);<a name="line.280"></a>
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locs.getDefaultRegionLocation();<a name="line.288"></a>
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IOException(String.format("HRegionInfo is null for '%s', row='%s', 
locateType=%s",<a name="line.292"></a>
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Bytes.toStringBinary(req.row), req.locateType)));<a name="line.293"></a>
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address listed for region '%s', row='%s', locateType=%s",<a name="line.302"></a>
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info.getRegionNameAsString(), Bytes.toStringBinary(req.row), 
req.locateType)));<a name="line.303"></a>
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info.getRegionNameAsString(), Bytes.toStringBinary(req.row), 
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null);<a name="line.325"></a>
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null);<a name="line.306"></a>
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+<span class="sourceLineNo">309</span><a name="line.309"></a>
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locateRowInCache(TableCache tableCache, TableName tableName, byte[] row) {<a 
name="line.310"></a>
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HRegionLocation&gt; entry = tableCache.cache.floorEntry(row);<a 
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+<span class="sourceLineNo">320</span>          Bytes.toStringBinary(row) + "', 
locateType=" + RegionLocateType.CURRENT);<a name="line.320"></a>
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Bytes.compareTo(loc.getRegion().getEndKey(), row) &gt;= 0) {<a 
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+<span class="sourceLineNo">347</span><a name="line.347"></a>
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-<span class="sourceLineNo">473</span>}<a name="line.473"></a>
+<span class="sourceLineNo">461</span>  void 
updateCachedLocation(HRegionLocation loc, Throwable exception) {<a 
name="line.461"></a>
+<span class="sourceLineNo">462</span>    
AsyncRegionLocator.updateCachedLocation(loc, exception, l -&gt; {<a 
name="line.462"></a>
+<span class="sourceLineNo">463</span>      TableCache tableCache = 
cache.get(l.getRegion().getTable());<a name="line.463"></a>
+<span class="sourceLineNo">464</span>      if (tableCache == null) {<a 
name="line.464"></a>
+<span class="sourceLineNo">465</span>        return null;<a 
name="line.465"></a>
+<span class="sourceLineNo">466</span>      }<a name="line.466"></a>
+<span class="sourceLineNo">467</span>      return 
tableCache.cache.get(l.getRegion().getStartKey());<a name="line.467"></a>
+<span class="sourceLineNo">468</span>    }, this::addToCache, 
this::removeFromCache);<a name="line.468"></a>
+<span class="sourceLineNo">469</span>  }<a name="line.469"></a>
+<span cla

<TRUNCATED>

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