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From Sandeep Nemuri <nhsande...@gmail.com>
Subject Re: HDFS HA Namenodes crash all the time
Date Sat, 19 Dec 2015 17:29:57 GMT
What does the logs say ?

On Sat, Dec 19, 2015 at 10:08 PM, Marcin Tustin <mtustin@handybook.com>

> Hi All,
> We have just switched over to HA namenodes with ZK failover, using HDP-
> (HDFS I'm looking for suggestions as to what to investigate to
> make this more stable.
> Before we went to HA our namenode was reasonably stable. Now, the
> namenodes are crashing multiple times a day, and frequently failing to fail
> over correctly; to the point where I can't even use haadmin
> -transitionToActive to force a failover. I find that instead I have to
> restart the namenodes.
> We're running them on AWS instances with 31.01GB and 8 cores. In addition
> to the namenode, we host a journalnode, a zkfailovercontroller, and the
> ambari metrics collector on the same machine. (The third journalnode lives
> with the yarn resource manager).
> Right now the namenodes are configured with a maximum heap of 25 GB.
> Does that sound credible? What else should we be paying attention to to
> make HDFS stable again?
> With thanks,
> Marcin
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*  Regards*
*  Sandeep Nemuri*

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