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https://issues.apache.org/jira/browse/HDFS-10817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15468414#comment-15468414
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Erik Krogen commented on HDFS-10817:
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Right, the {{getReadHoldCount}} vs. {{getReadLockCount}} distinction is not
very obvious but very important!
> 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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