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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