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https://issues.apache.org/jira/browse/HDFS-8549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14581799#comment-14581799
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Hudson commented on HDFS-8549:
------------------------------
FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #225 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/225/])
HDFS-8549. Abort the balancer if an upgrade is in progress. (wang: rev
a7a7768341f1b7d3a8f2686e2f4d00c57f2e1d4f)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/balancer/TestBalancer.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/ExitStatus.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java
> Abort the balancer if an upgrade is in progress
> -----------------------------------------------
>
> Key: HDFS-8549
> URL: https://issues.apache.org/jira/browse/HDFS-8549
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer & mover
> Affects Versions: 2.7.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Fix For: 2.8.0
>
> Attachments: HDFS-8549.001.patch, HDFS-8549.002.patch,
> HDFS-8549.003.patch, HDFS-8549.004.patch
>
>
> Running the balancer during an ongoing upgrade has a negative affect, since
> DNs do not actually delete blocks. This means the balancer is making lots of
> extra replicas and not actually reducing the disk utilization of
> over-utilized nodes.
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