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From "Xudong Cao (Jira)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-16677) The remaining millis timeout printed into the log also need to be recalculated when thread is interrupted while blocking in select().
Date Thu, 31 Oct 2019 07:49:00 GMT
Xudong Cao created HADOOP-16677:
-----------------------------------

             Summary: The remaining millis timeout printed into the log also need to be recalculated
when thread is interrupted while blocking in select().
                 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


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_9573675038java.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}
 

This log is very misleading because a 60000 mills timeout left implies that the DataXceiver
never blocks in select(), and this is unrealistic.  in fact, the truly timeout mills left
should be: 60000 - timeElapsedWhenSelect.

Finally, a properly log should be like this:

 

 



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