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https://issues.apache.org/jira/browse/HDFS-16642?focusedWorklogId=797523&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-797523
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ASF GitHub Bot logged work on HDFS-16642:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 03/Aug/22 07:20
Start Date: 03/Aug/22 07:20
Worklog Time Spent: 10m
Work Description: ferhui commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1203579943
The PR has hung there for 10 days. @ZanderXu could you please push an empty
commit to trigger CI? We can avoid potential conflicts and merge it after CI
runs.
Issue Time Tracking
-------------------
Worklog Id: (was: 797523)
Time Spent: 1h (was: 50m)
> [SBN read] Moving selecting inputstream from JN in EditlogTailer out of
> FSNLock
> -------------------------------------------------------------------------------
>
> Key: HDFS-16642
> URL: https://issues.apache.org/jira/browse/HDFS-16642
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> EditlogTailer cost a long time for selecting InputStreams from Journalnode
> while holding the write lock of FSNLock.
> During this period, 8020 handlers of Observer NameNode will be blocked by the
> FSN Lock.
> In theory, selecting inputstreams from JournalNode does not involve changing
> memory information in NameNode, so we can move the selecting out of the FSN
> Lock, and it can improve the throughput of Observer NameNode.
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