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https://issues.apache.org/jira/browse/HDFS-6763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14076294#comment-14076294
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Daryn Sharp commented on HDFS-6763:
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We're already seeing at least 6s hangs on some clusters, and expect >20s on
larger clusters.
> Standby NN stalls after processing edits
> ----------------------------------------
>
> Key: HDFS-6763
> URL: https://issues.apache.org/jira/browse/HDFS-6763
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha, namenode
> Reporter: Daryn Sharp
>
> {{FSImage#loadEdits}} calls {{updateCountForQuota}} to recalculate & verify
> quotas for the entire namespace. A standby NN using shared edits calls this
> method every minute. The standby may appear to "hang" for many seconds.
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