[jira] [Created] (HDFS-17434) Selector.select in SocketIOWithTimeout.java has significant overhead

["qinyuren (Jira)" <ji...@apache.org>]

qinyuren created HDFS-17434:
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             Summary: Selector.select in SocketIOWithTimeout.java has significant overhead
                 Key: HDFS-17434
                 URL: https://issues.apache.org/jira/browse/HDFS-17434
             Project: Hadoop HDFS
          Issue Type: Task
            Reporter: qinyuren
         Attachments: image-2024-03-20-19-10-13-016.png, image-2024-03-20-19-22-29-829.png, image-2024-03-20-19-24-02-233.png

In our cluster, the SendDataPacketBlockedOnNetworkNanosAvgTime metric ranges from 5ms to 10ms, exceeding the usual disk reading overhead.

!image-2024-03-20-19-10-13-016.png|width=662,height=135!

By adding log printing, it turns out that the Selector.select function has significant overhead.

!image-2024-03-20-19-22-29-829.png|width=474,height=262!

!image-2024-03-20-19-24-02-233.png|width=445,height=181!

I would like to know if this falls within the normal range or how we can improve it.

 



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