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Posted to hdfs-dev@hadoop.apache.org by "Xiaoming Shi (JIRA)" <ji...@apache.org> on 2011/03/01 03:23:36 UTC

[jira] Created: (HDFS-1676) DateFormat.getDateTimeInstance() is very expensive, we can cache it to improve performance

DateFormat.getDateTimeInstance() is very expensive, we can cache it to improve performance
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                 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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