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From Dima Spivak <dimaspi...@apache.org>
Subject Re: HBase restart without region reassigning
Date Mon, 17 Oct 2016 15:28:48 GMT
Hey Alexander,

Could something be amiss in your network settings? Seeing phantom datanodes
could be tripping things up. Are these physical machines or instances in
the cloud?

On Monday, October 17, 2016, Alexander Ilyin <alexander@weborama.com> wrote:

> Hi,
> We have a 7-node HBase cluster (version 1.1.2) and we change some of its
> settings from time to time which requires a restart. The problem is that
> every time after the restart load balancer reassigns the regions making
> data locality low.
> To address this issue we tried the settings described here:
> https://issues.apache.org/jira/browse/HBASE-6389,
> "hbase.master.wait.on.regionservers.interval" in particular. We tried it
> two times in slightly different ways but neither of them worked. First time
> we did a rolling restart (master, then each of datanodes) and we saw 14
> datanodes instead of 7 in Master UI. Half of them had the regions on it
> while the other half was empty. We restarted master only and we got 7 empty
> datanodes in Master UI. After that we rollbacked the setting.
> Second time we restarted master and datanodes at the same time but master
> failed to read meta table, moved it to a different datanode and reassigned
> the regions again.
> Please advise on how to use hbase.master.wait.on.regionservers.* settings
> properly. Launching major compactions for all the tables after each config
> change seems to be an overkill. Attaching Master server logs with relevant
> lines for two attempts mentioned above.
> Thanks in advance.


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