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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1676) DateFormat.getDateTimeInstance() is very expensive, we can cache it to improve performance
Date Tue, 01 Mar 2011 03:48:37 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13000689#comment-13000689
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Tsz Wo (Nicholas), SZE commented on HDFS-1676:
----------------------------------------------

This may be negligible since one iteration of the while-loop takes a long time (seconds or
even minutes).

> DateFormat.getDateTimeInstance() is very expensive, we can cache it to improve performance
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1676
>                 URL: https://issues.apache.org/jira/browse/HDFS-1676
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer
>    Affects Versions: 0.21.0
>            Reporter: Xiaoming Shi
>
> In the file:
> ./hadoop-0.21.0/hdfs/src/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java  line:1520
> In the while loop, DateFormat.getDateTimeInstance()is called in each iteration. We can
cache the result by moving it outside the loop or adding a class member.
> This is similar to the Apache bug https://issues.apache.org/bugzilla/show_bug.cgi?id=48778


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