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https://issues.apache.org/jira/browse/HDFS-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13178160#comment-13178160
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Hudson commented on HDFS-554:
-----------------------------
Integrated in Hadoop-Mapreduce-trunk #945 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/945/])
HDFS-554. Use System.arraycopy in BlockInfo.ensureCapacity. (harsh)
harsh : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1226239
Files :
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockInfo.java
> 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: 0.24.0
>
> 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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