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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-13730) BlockReaderRemote.sendReadResult throws NPE
Date Wed, 11 Jul 2018 20:12:00 GMT
Wei-Chiu Chuang created HDFS-13730:
--------------------------------------

             Summary: BlockReaderRemote.sendReadResult throws NPE
                 Key: HDFS-13730
                 URL: https://issues.apache.org/jira/browse/HDFS-13730
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
         Environment: Hadoop 3.0.0, HBase 2.0.0 + HBASE-20403.
            Reporter: Wei-Chiu Chuang


Found the following exception thrown in a HBase RegionServer log (Hadoop 3.0.0 + HBase 2.0.0.
The hbase prefetch bug HBASE-20403 was fixed on this cluster, but I am not sure if that's
related at all):
{noformat}
2018-07-11 11:10:44,462 WARN org.apache.hadoop.hbase.io.hfile.HFileReaderImpl: Stream moved/closed
or prefetch cancelled?path=hdfs://ns1/hbase/data/default/IntegrationTestBigLinkedList_20180711003954/449fa9bf5a7483295493258b5af50abc/meta/e9de0683f8a9413a94183c752bea0ca5,
offset=216505135,
end=2309991906
java.lang.NullPointerException
at org.apache.hadoop.hdfs.net.NioInetPeer.getRemoteAddressString(NioInetPeer.java:99)
at org.apache.hadoop.hdfs.net.EncryptedPeer.getRemoteAddressString(EncryptedPeer.java:105)
at org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.sendReadResult(BlockReaderRemote.java:330)
at org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.readNextPacket(BlockReaderRemote.java:233)
at org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.read(BlockReaderRemote.java:165)
at org.apache.hadoop.hdfs.DFSInputStream.actualGetFromOneDataNode(DFSInputStream.java:1050)
at org.apache.hadoop.hdfs.DFSInputStream.fetchBlockByteRange(DFSInputStream.java:992)
at org.apache.hadoop.hdfs.DFSInputStream.pread(DFSInputStream.java:1348)
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1312)
at org.apache.hadoop.crypto.CryptoInputStream.read(CryptoInputStream.java:331)
at org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:92)
at org.apache.hadoop.hbase.io.hfile.HFileBlock.positionalReadWithExtra(HFileBlock.java:805)
at org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readAtOffset(HFileBlock.java:1565)
at org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockDataInternal(HFileBlock.java:1769)
at org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockData(HFileBlock.java:1594)
at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.readBlock(HFileReaderImpl.java:1488)
at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$1.run(HFileReaderImpl.java:278)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748){noformat}
The relevant Hadoop code:
{code:java|title=BlockReaderRemote#sendReadResult}
void sendReadResult(Status statusCode) {
  assert !sentStatusCode : "already sent status code to " + peer;
  try {
    writeReadResult(peer.getOutputStream(), statusCode);
    sentStatusCode = true;
  } catch (IOException e) {
    // It's ok not to be able to send this. But something is probably wrong.
    LOG.info("Could not send read status (" + statusCode + ") to datanode " +
        peer.getRemoteAddressString() + ": " + e.getMessage());
  }
}
{code}
So the NPE was thrown within a exception handler. A possible explanation could be that the
socket was closed so client couldn't write, and Socket#getRemoteSocketAddress() returns null
when the socket is closed.

Suggest check for nullity and return an empty string in
{noformat}
NioInetPeer.getRemoteAddressString{noformat}
.



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