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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-554) BlockInfo.ensureCapacity may get a speedup from System.arraycopy()
Date Sat, 07 Jan 2012 03:57:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181837#comment-13181837
] 

Hudson commented on HDFS-554:
-----------------------------

Integrated in Hadoop-Common-trunk-Commit #1511 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/1511/])
    Merged HDFS-2349, HDFS-2729, HDFS-2726, HDFS-554, HDFS-1314, HADOOP-7910 to branch-0.23,
updating CHANGES.txt for trunk.

harsh : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1228567
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

                
> 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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