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https://issues.apache.org/jira/browse/HDFS-10817?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhe Zhang updated HDFS-10817:
-----------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
I committed the patch from trunk to branch-2.7. Note that from trunk to
branch-2.8 there is an addendum fix, because the test failure was found when I
tried backporting from branch-2.8 to branch-2.7.
Thanks [~xkrogen] for the contribution. Great work!
> Add Logging for Long-held NN Read Locks
> ---------------------------------------
>
> Key: HDFS-10817
> URL: https://issues.apache.org/jira/browse/HDFS-10817
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: logging, namenode
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Fix For: 2.8.0, 2.7.4, 3.0.0-alpha2
>
> Attachments: HDFS-10817.000.patch, HDFS-10817.001.patch,
> HDFS-10817.002.patch, HDFS-10817.003.patch, HDFS-10817.004.patch,
> HDFS-10817.addendum.000.patch, HDFS-10817.addendum.001.patch
>
>
> Right now the Namenode will log when a write lock is held for a long time to
> help tracks methods which are causing expensive delays. Let's do the same for
> read locks since these operations may also be expensive/long and cause
> delays.
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