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From "Xudong Cao (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-16677) Recalculate the remaining timeout millis correctly while throwing an InterupptedException in SocketIOWithTimeout.
Date Thu, 31 Oct 2019 11:18:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-16677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xudong Cao updated HADOOP-16677:
--------------------------------
    Status: Open  (was: Patch Available)

> Recalculate the remaining timeout millis correctly while throwing an InterupptedException
in SocketIOWithTimeout.
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-16677
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16677
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: common
>    Affects Versions: 3.1.3
>            Reporter: Xudong Cao
>            Assignee: Xudong Cao
>            Priority: Minor
>
> In SocketIOWithTimeout, when a thread was interrupted and exit from select(), it proceed
to throw an InterruptedIOException, in exception message the remaining timeout mills should
be recalcuated correctly rather than simply give a total timeout millis ,  otherwise it could
be very misleading.
> For example, if an hdfs writer has not sent any packet to the pipeline more than 60s
(e.g. full gc or network issues),  then one of pipeline datanodes may be timeout and close
its sockets to other dns,  so its upstream DN's PacketResponder will immediately meet an
EOF and then interrupt its own DataXceiver, finally its DataXeiver will print some logs like:
> {code:java}
> 2019-10-24 09:22:58,212 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Exception
for BP-753871533-10.215.131.216-1511957392115:blk_10646544613_95736750382019-10-24 09:22:58,212
INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Exception for BP-753871533-10.215.131.216-1511957392115:blk_10646544613_9573675038
> java.io.InterruptedIOException: Interrupted while waiting for IO on channel java.nio.channels.SocketChannel[connected
local=/10.196.146.114:9003 remote=/10.215.153.105:38559]. 60000 millis timeout left.
>  at org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:342)
>  at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
>  ...
>  
> {code}
> However, This log is wrong and very misleading, a 60000 mills timeout left implies that
the DataXceiver has never blocked in select(),  but this is not the actual situation,  In
fact, the truly timeout mills left is 60000 - timeElapsedWhenSelect, rather than simply 60000.
> Finally, a properly log should be like this, the key improvment is "*Total timeout mills
is 60000, 1000 millis timeout left*":  
> {code:java}
> 2019-10-31 16:20:39,496 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Exception
for BP-1895911599-192.168.202.11-1572488735889:blk_1073741833_10162019-10-31 16:20:39,496
INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Exception for BP-1895911599-192.168.202.11-1572488735889:blk_1073741833_1016
> java.io.InterruptedIOException: Interrupted while waiting for IO on channel java.nio.channels.SocketChannel[connected
local=/192.168.202.12:50010 remote=/192.168.202.11:57006]. Total timeout mills is 60000, 1000
millis timeout left.
>  at org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:351)
>  at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
>  ...
> {code}



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