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From "Yang Jiandan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7145) DFSInputStream does not return when reading
Date Thu, 25 Sep 2014 09:05:34 GMT
Yang Jiandan created HDFS-7145:
----------------------------------

             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´╝Ü
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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