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https://issues.apache.org/jira/browse/HDFS-13783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16892884#comment-16892884
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Chen Zhang commented on HDFS-13783:
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Thanks [~xkrogen] for your patient review and detailed comments
{quote}Take a look at the output for {{TestHdfsConfigFields}}
{quote}
It's curious, I've run this test in my Intellij IDEA and it passed that day,
but it indeed should fail... sorry for that
{quote}Why do we have {{Thread.sleep(500)}} on {{TestBalancerService}} L71?
{quote}
At first the UT is always failed because extra replica not delated after
cluster balanced, so I add a sleep to wait for the extra replica deleted. But
after some other improvements, it's actually not necessary. I've removed that
> 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
>
>
> 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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