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https://issues.apache.org/jira/browse/HADOOP-18654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17698052#comment-17698052
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ASF GitHub Bot commented on HADOOP-18654:
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jojochuang commented on PR #5457:
URL: https://github.com/apache/hadoop/pull/5457#issuecomment-1460722816
The only use of this class among Apache projects is in Chukwa which is in
attic.
But a number of Apache projects (Ambari, Bigtop, among others) has
log4j.properties referencing TaskLogAppender.
(https://github.com/search?l=Java+Properties&p=2&q=org%3Aapache+org.apache.hadoop.mapred.TaskLogAppender&type=Code)
If this is a Hadoop 3.4.0 only change then it's okay.
> Remove unused custom appender TaskLogAppender
> ---------------------------------------------
>
> Key: HADOOP-18654
> URL: https://issues.apache.org/jira/browse/HADOOP-18654
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Labels: pull-request-available
>
> TaskLogAppender is no longer being used in codebase. The only past references
> we have are from old releasenotes (HADOOP-7308, MAPREDUCE-3208,
> MAPREDUCE-2372, HADOOP-1355).
> Before we migrate to log4j2, it would be good to remove TaskLogAppender.
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