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https://issues.apache.org/jira/browse/MAPREDUCE-5040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590880#comment-13590880
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Siddharth Seth commented on MAPREDUCE-5040:
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Just to be clear, this refers to the classes in
org.apache.hadoop.mapreduce.v2.api.records
> Make JobId, TaskId, TaskAttemptId immutable
> -------------------------------------------
>
> Key: MAPREDUCE-5040
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5040
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Siddharth Seth
>
> These classes don't really need to be mutable. The current implementation
> synchronizes on pretty much all operations - which should be avoided.
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