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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:
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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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