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https://issues.apache.org/jira/browse/HDFS-7929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14560184#comment-14560184
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Colin Patrick McCabe commented on HDFS-7929:
--------------------------------------------
The time needed to copy over the edit logs can cause performance problems in
some clusters. HDFS-8480 will fix this by using hardlinking instead.
> inotify unable fetch pre-upgrade edit log segments once upgrade starts
> ----------------------------------------------------------------------
>
> Key: HDFS-7929
> URL: https://issues.apache.org/jira/browse/HDFS-7929
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Zhe Zhang
> Assignee: Zhe Zhang
> Fix For: 2.7.0
>
> Attachments: HDFS-7929-000.patch, HDFS-7929-001.patch,
> HDFS-7929-002.patch, HDFS-7929-003.patch
>
>
> inotify is often used to periodically poll HDFS events. However, once an HDFS
> upgrade has started, edit logs are moved to /previous on the NN, which is not
> accessible. Moreover, once the upgrade is finalized /previous is currently
> lost forever.
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