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https://issues.apache.org/jira/browse/HDFS-7266?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-7266:
---------------------------------------
Priority: Minor (was: Major)
Affects Version/s: (was: 2.6.0)
2.7.0
Issue Type: Improvement (was: Bug)
> HDFS Peercache enabled check should not lock on object
> ------------------------------------------------------
>
> Key: HDFS-7266
> URL: https://issues.apache.org/jira/browse/HDFS-7266
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.7.0
> Reporter: Gopal V
> Assignee: Andrew Wang
> Priority: Minor
> Labels: multi-threading
> Attachments: dfs-open-10-threads.png, hdfs-7266.001.patch
>
>
> HDFS fs.Open synchronizes on the Peercache, even when peer cache is disabled.
> {code}
> public synchronized Peer get(DatanodeID dnId, boolean isDomain) {
> if (capacity <= 0) { // disabled
> return null;
> }
> {code}
> since capacity is a final, this could be moved outside the lock.
> !dfs-open-10-threads.png!
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