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https://issues.apache.org/jira/browse/HBASE-16212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15372130#comment-15372130
]
Zhihua Deng commented on HBASE-16212:
-------------------------------------
When the datanode writes to the closed connection, an exception will occur:
2016-06-30 11:21:34,320 TRACE org.apache.hadoop.hdfs.server.datanode.DataNode:
DatanodeRegistration(10.130.1.29:50010,
datanodeUuid=f3d795cc-2b3b-43b9-90c3-e4157c031d2c, infoPort=50075,
infoSecurePort=0, ipcPort=50020,
storageInfo=lv=-56;cid=CID-a99b693d-6f26-48fe-ad37-9f8162f70b22;nsid=920937379;c=0):Ignoring
exception while serving
BP-360285305-10.130.1.11-1444619256876:blk_1105510536_31776579 to
/10.130.1.21:39933
java.net.SocketException: Original Exception : java.io.IOException: Connection
reset by peer
at sun.nio.ch.FileChannelImpl.transferTo0(Native Method)
at
sun.nio.ch.FileChannelImpl.transferToDirectlyInternal(FileChannelImpl.java:427)
at
sun.nio.ch.FileChannelImpl.transferToDirectly(FileChannelImpl.java:492)
at sun.nio.ch.FileChannelImpl.transferTo(FileChannelImpl.java:607)
at
org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:223)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendPacket(BlockSender.java:579)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.doSendBlock(BlockSender.java:759)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:706)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:551)
at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:116)
at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:71)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:251)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Connection reset by peer
... 13 more
By analyzing the regionserver's log, pos - targetPos = 33, which is equal to
the length of block header, seen from HFileBlock.java.
> Many Connections are created by wrong seeking pos on InputStream
> ----------------------------------------------------------------
>
> Key: HBASE-16212
> URL: https://issues.apache.org/jira/browse/HBASE-16212
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.1.2
> Reporter: Zhihua Deng
>
> As described in https://issues.apache.org/jira/browse/HDFS-8659, the datanode
> is suffering from logging the same repeatedly. Adding log to DFSInputStream,
> it outputs as follows:
> 2016-07-10 21:31:42,147 INFO
> [B.defaultRpcServer.handler=22,queue=1,port=16020] hdfs.DFSClient:
> DFSClient_NONMAPREDUCE_1984924661_1 seek
> DatanodeInfoWithStorage[10.130.1.29:50010,DS-086bc494-d862-470c-86e8-9cb7929985c6,DISK]
> for BP-360285305-10.130.1.11-1444619256876:blk_1109360829_35627143. pos:
> 111506876, targetPos: 111506843
> ...
> As the pos of this input stream is larger than targetPos(the pos trying to
> seek), A new connection to the datanode will be created, the older one will
> be closed as a consequence. When the wrong seeking ops are large, the
> datanode's block scanner info message is spamming logs, as well as many
> connections to the same datanode will be created.
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