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https://issues.apache.org/jira/browse/HDFS-1775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee resolved HDFS-1775.
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Resolution: Duplicate
> getContentSummary should hold the FSNamesystem readlock
> -------------------------------------------------------
>
> Key: HDFS-1775
> URL: https://issues.apache.org/jira/browse/HDFS-1775
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Dmytro Molkov
> Assignee: Dmytro Molkov
> Priority: Minor
>
> Right now the getContentSummary call on the namenode only holds the
> FSDirectory lock, but not the FSNamesystem lock. What we are seeing because
> of that is:
> 1) getContentSummary takes the read lock on FSDirectory
> 2) the write operation comes and takes a write lock on FSNamesystem and waits
> for getContentSummary to finish to get a write lock on FSDirectory
> As a result other read operations can't be executed. Since getContentSummary
> can take a while to execute on large directories, the performance would be
> improved if we hold a readlock while doing that.
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