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https://issues.apache.org/jira/browse/HDFS-13783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16895351#comment-16895351
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Chen Zhang commented on HDFS-13783:
-----------------------------------
New checkstyle warnings are introduced by DFSConifgKeys.java, I think we should
ignore that.
TestDataNodeHotSwapVolumes failed intermittently(occurred twice in this Jira),
but it can run successful in local. From the error stack, I think the reason is
that UT use ArrayList in multi-thread environment:
{code:java}
List<Thread> addVolumeDelayedThreads = new ArrayList<>();
{code}
I've created a Jira HDFS-14677 to track this
> Balancer: make balancer to be a long service process for easy to monitor it.
> ----------------------------------------------------------------------------
>
> Key: HDFS-13783
> URL: https://issues.apache.org/jira/browse/HDFS-13783
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: balancer & mover
> Reporter: maobaolong
> Assignee: Chen Zhang
> Priority: Major
> Attachments: HDFS-13783-001.patch, HDFS-13783-002.patch,
> HDFS-13783.003.patch, HDFS-13783.004.patch, HDFS-13783.005.patch,
> HDFS-13783.006.patch
>
>
> If we have a long service process of balancer, like namenode, datanode, we
> can get metrics of balancer, the metrics can tell us the status of balancer,
> the amount of block it has moved,
> We can get or set the balance plan by the balancer webUI. So many things we
> can do if we have a long balancer service process.
> So, shall we start to plan the new Balancer? Hope this feature can enter the
> next release of hadoop.
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