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From Stanley Shi <s...@gopivotal.com>
Subject Re: how to reduce delay in HDFS restart
Date Thu, 24 Jul 2014 05:58:16 GMT
Do you have a secondary namenode running? Secondary NN is used for this
purpose;
Also, if you have HDFS HA enabled, this problem will also not occur.

Regards,
*Stanley Shi,*



On Tue, Jul 22, 2014 at 7:24 AM, Anfernee Xu <anfernee.xu@gmail.com> wrote:

> Hi,
>
> For some reason, all PIDs file are missing in my cluster, I have to
> manually kill all java processes on all machines, then I restarted the
> HDFS, but it took so long time in applying changes in edit log file, so my
> question is how can I reduce the delay? My understanding is as follows,
> could someone please give some comments on it?
>
>     hadoop dfsadmin -safemode enter
>
>     #save current in-mem data to image file and reset edit log
>     hadoop dfsadmin -saveNamespace
>
>
> --
> --Anfernee
>

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