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https://issues.apache.org/jira/browse/HDFS-554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J updated HDFS-554:
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Target Version/s: (was: 0.23.1)
Fix Version/s: (was: 0.24.0)
0.23.1
Backported to 0.23.
> BlockInfo.ensureCapacity may get a speedup from System.arraycopy()
> ------------------------------------------------------------------
>
> Key: HDFS-554
> URL: https://issues.apache.org/jira/browse/HDFS-554
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.21.0
> Reporter: Steve Loughran
> Assignee: Harsh J
> Priority: Minor
> Fix For: 0.23.1
>
> Attachments: HDFS-554.patch, HDFS-554.txt, HDFS-554.txt
>
>
> BlockInfo.ensureCapacity() uses a for() loop to copy the old array data into
> the expanded array. {{System.arraycopy()}} is generally much faster for
> this, as it can do a bulk memory copy. There is also the typesafe Java6
> {{Arrays.copyOf()}} to consider, though here it offers no tangible benefit.
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