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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