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https://issues.apache.org/jira/browse/HDFS-9221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Staffan Friberg updated HDFS-9221:
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Status: Patch Available (was: Open)
Small change so could hopefully go into 2.8.0
> Reduce allocation during block reports
> --------------------------------------
>
> Key: HDFS-9221
> URL: https://issues.apache.org/jira/browse/HDFS-9221
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: performance
> Affects Versions: 2.7.1
> Reporter: Staffan Friberg
> Assignee: Staffan Friberg
> Attachments: ReplicaState.patch
>
>
> When the BufferDecoder in BlockListAsLongs converts the stored value to a
> ReplicaState enum it calls ReplicaState.getState(int) unfortunately this
> method creates a ReplicaState[] for each call since it calls
> ReplicaState.values().
> This patch creates a cached version of the values and thus avoid all
> allocation when doing the conversion.
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