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https://issues.apache.org/jira/browse/HDFS-16642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang updated HDFS-16642:
-----------------------------------
Summary: [SBN read] Moving selecting inputstream from JN in EditlogTailer
out of FSNLock (was: [HDFS] Moving selecting inputstream from JN in
EditlogTailer out of FSNLock)
> [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: 20m
> 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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