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https://issues.apache.org/jira/browse/HDFS-16070?focusedWorklogId=611270&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-611270
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ASF GitHub Bot logged work on HDFS-16070:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 15/Jun/21 11:42
Start Date: 15/Jun/21 11:42
Worklog Time Spent: 10m
Work Description: zhengchenyu edited a comment on pull request #3105:
URL: https://github.com/apache/hadoop/pull/3105#issuecomment-861146706
@ayushtkn @goiri can you help me review this PR?
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Issue Time Tracking
-------------------
Worklog Id: (was: 611270)
Time Spent: 1h 20m (was: 1h 10m)
> DataTransfer block storm when datanode's io is busy.
> ----------------------------------------------------
>
> Key: HDFS-16070
> URL: https://issues.apache.org/jira/browse/HDFS-16070
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.3.0, 3.2.1
> Reporter: zhengchenyu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> When I speed up the decommission, I found that some datanode's io is busy,
> then I found host's load is very high, and ten thousands data transfer thread
> are running.
> Then I find log like below.
> {code}
> # setup datatranfer log
> 2021-06-08 13:42:37,620 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> DatanodeRegistration(10.201.4.49:9866,
> datanodeUuid=6c55b7cb-f8ef-445b-9cca-d82b5b077ed1, infoPort=9864,
> infoSecurePort=0, ipcPort=9867,
> storageInfo=lv=-57;cid=CID-37e80bd5-733a-4d7b-ba3d-b46269573c72;nsid=215490653;c=1584525570797)
> Starting thread to transfer
> BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611 to
> 10.201.7.52:9866
> 2021-06-08 13:52:36,345 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> DatanodeRegistration(10.201.4.49:9866,
> datanodeUuid=6c55b7cb-f8ef-445b-9cca-d82b5b077ed1, infoPort=9864,
> infoSecurePort=0, ipcPort=9867,
> storageInfo=lv=-57;cid=CID-37e80bd5-733a-4d7b-ba3d-b46269573c72;nsid=215490653;c=1584525570797)
> Starting thread to transfer
> BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611 to
> 10.201.7.31:9866
> 2021-06-08 14:02:37,197 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> DatanodeRegistration(10.201.4.49:9866,
> datanodeUuid=6c55b7cb-f8ef-445b-9cca-d82b5b077ed1, infoPort=9864,
> infoSecurePort=0, ipcPort=9867,
> storageInfo=lv=-57;cid=CID-37e80bd5-733a-4d7b-ba3d-b46269573c72;nsid=215490653;c=1584525570797)
> Starting thread to transfer
> BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611 to
> 10.201.16.50:9866
> # datatranfer done log
> 2021-06-08 13:54:08,134 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> DataTransfer, at bd-tz1-hadoop-004049.zeus.lianjia.com:9866: Transmitted
> BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611
> (numBytes=7457424) to /10.201.7.52:9866
> 2021-06-08 14:10:47,170 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> DataTransfer, at bd-tz1-hadoop-004049.zeus.lianjia.com:9866: Transmitted
> BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611
> (numBytes=7457424) to /10.201.16.50:9866
> {code}
> You will see last datatranfser thread was done on 13:54:08, but next
> datatranfser was start at 13:52:36.
> If datatranfser was not done in 10min(pending timeout + check interval), then
> next datatranfser for same block will be running. Then disk and network are
> heavy.
> Note: decommission ec block will trigger this problem easily, becuase every
> ec internal block are unique.
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