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MapReduce >> mail # user >> Re: disk used percentage is not symmetric on datanodes (balancer)


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Tapas Sarangi 2013-03-19, 01:26
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Re: disk used percentage is not symmetric on datanodes (balancer)
Hi,

It is not explicitly said but did you use the balancer?
http://hadoop.apache.org/docs/r1.0.4/commands_manual.html#balancer

Regards

Bertrand

On Mon, Mar 18, 2013 at 10:01 PM, Tapas Sarangi <[EMAIL PROTECTED]>wrote:

> Hello,
>
> I am using one of the old legacy version (0.20) of hadoop for our cluster.
> We have scheduled for an upgrade to the newer version within a couple of
> months, but I would like to understand a couple of things before moving
> towards the upgrade plan.
>
> We have about 200 datanodes and some of them have larger storage than
> others. The storage for the datanodes varies between 12 TB to 72 TB.
>
> We found that the disk-used percentage is not symmetric through all the
> datanodes. For larger storage nodes the percentage of disk-space used is
> much lower than that of other nodes with smaller storage space. In larger
> storage nodes the percentage of used disk space varies, but on average
> about 30-50%. For the smaller storage nodes this number is as high as
> 99.9%. Is this expected ? If so, then we are not using a lot of the disk
> space effectively. Is this solved in a future release ?
>
> If no, I would like to know  if there are any checks/debugs that one can
> do to find an improvement with the current version or upgrading hadoop
> should solve this problem.
>
> I am happy to provide additional information if needed.
>
> Thanks for any help.
>
> -Tapas
>
>
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Алексей Бабутин 2013-03-22, 16:05
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Jamal B 2013-03-24, 20:29
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see1230 2013-03-25, 03:33
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Tapas Sarangi 2013-03-24, 20:48
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Alexey Babutin 2013-03-24, 21:46
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Tapas Sarangi 2013-03-25, 00:29
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Alexey Babutin 2013-03-24, 21:50
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Tapas Sarangi 2013-03-24, 20:44
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Jamal B 2013-03-24, 21:34
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Tapas Sarangi 2013-03-24, 23:09
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Jamal B 2013-03-25, 01:06
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Tapas Sarangi 2013-03-25, 01:25
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Jamal B 2013-03-25, 02:09
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Alexey Babutin 2013-03-24, 21:04
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB