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https://issues.apache.org/jira/browse/HDFS-13122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erik Krogen resolved HDFS-13122.
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Resolution: Duplicate
> Tailing edits should not update quota counts on ObserverNode
> ------------------------------------------------------------
>
> Key: HDFS-13122
> URL: https://issues.apache.org/jira/browse/HDFS-13122
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs, namenode
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Priority: Major
>
> Currently in {{FSImage#loadEdits()}}, after applying a set of edits, we call
> {code}
> updateCountForQuota(target.getBlockManager().getStoragePolicySuite(),
> target.dir.rootDir);
> {code}
> to update the quota counts for the entire namespace, which can be very
> expensive. This makes sense if we are about to become the ANN, since we need
> valid quotas, but not on an ObserverNode which does not need to enforce
> quotas.
> This is related to increasing the frequency with which the SbNN can tail
> edits from the ANN to decrease the lag time for transactions to appear on the
> Observer.
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