Yang Jiandan created HDFS-7145:
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Summary: DFSInputStream does not return when reading
Key: HDFS-7145
URL: https://issues.apache.org/jira/browse/HDFS-7145
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Affects Versions: 2.5.0
Reporter: Yang Jiandan
Priority: Critical
We found that DFSInputStream#read does not return when hbase handlers read
files from hdfs, and all handlers are in the
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(). jstack is as
follows:
"RS_PARALLEL_SEEK-hadoop474:60020-9" prio=10 tid=0x00007f7350be0000 nid=0x1572
runnable [0x000000005a9de000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
- locked <0x000000039ad6e730> (a sun.nio.ch.Util$2)
- locked <0x000000039ad6e320> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000002bf480738> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:335)
at
org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
at
org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161)
at
org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:131)
at
org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:118)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at
org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:1986)
at
org.apache.hadoop.hdfs.RemoteBlockReader2.newBlockReader(RemoteBlockReader2.java:395)
at
org.apache.hadoop.hdfs.BlockReaderFactory.getRemoteBlockReader(BlockReaderFactory.java:786)
at
org.apache.hadoop.hdfs.BlockReaderFactory.getRemoteBlockReaderFromTcp(BlockReaderFactory.java:665)
at
org.apache.hadoop.hdfs.BlockReaderFactory.build(BlockReaderFactory.java:325)
at
org.apache.hadoop.hdfs.DFSInputStream.actualGetFromOneDataNode(DFSInputStream.java:1023)
at
org.apache.hadoop.hdfs.DFSInputStream.fetchBlockByteRange(DFSInputStream.java:966)
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1293)
at
org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:90)
at
org.apache.hadoop.hbase.io.hfile.HFileBlock$AbstractFSReader.readAtOffset(HFileBlock.java:1223)
at
org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockDataInternal(HFileBlock.java:1430)
at
org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockData(HFileBlock.java:1312)
at
org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:392)
at
org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:253)
at
org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:532)
at
org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:553)
at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:237)
at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:152)
at
org.apache.hadoop.hbase.regionserver.handler.ParallelSeekHandler.process(ParallelSeekHandler.java:57)
at
org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:128)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
I read HDFS source code and discover：
1. NioInetPeer#in and NioInetPeer#out default timeout value is 0
NioInetPeer(Socket socket) throws IOException {
this.socket = socket;
this.in = new SocketInputStream(socket.getChannel(), 0);
this.out = new SocketOutputStream(socket.getChannel(), 0);
this.isLocal = socket.getInetAddress().equals(socket.getLocalAddress());
}
and result in SocketIOWithTimeout#timeout=0
2. BlockReaderPeer#peer does not set ReadTimeout and WriteTimeout
which lead to
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(timeout=0) and
does not return.
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