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From baggio liu <baggi...@gmail.com>
Subject Re: How to Speed Up Decommissioning progress of a datanode.
Date Thu, 16 Dec 2010 07:42:07 GMT
You can use metasave to check the bottleneck of decommion speed,
If the bottleneck is the speed of namenode dispatch. You can tuning
dfs.max-repl-streams to a large number (default 2).
If there're  many timeout block replication tasks from pending replication
queue to need replication , you can tuning
dfs.replication.pending.timeout.sec to a smaller numer, to make block
replcation more positive.

Pay attention!!  Please check your hadoop version, if block transfer has no
speed limit, the bandwidth may be stuff full


Thanks & Best regards
Baggio


2010/12/16 sravankumar <sravankumar@huawei.com>

> Hi,
>
>
>
>            Does any one know how to speed up datanode decommissioning and
> what are all the configurations
>
> related to the decommissioning.
>
>            How to Speed Up Data Transfer from the Datanode getting
> decommissioned.
>
>
>
> Thanks & Regards,
>
> Sravan kumar.
>
>

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