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From "Denis Petrov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4412) Support HDFS IO throttling
Date Fri, 01 Mar 2013 17:33:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590743#comment-13590743
] 

Denis Petrov commented on HDFS-4412:
------------------------------------

It would be nice to throttle on per-datanode basis, liming not the bandwidth of the current
stream, but the IO bandwidth on the bottleneck datanode.

If few throttled writes go to the same datanode, the throttling threshold should be adjusted.

                
> Support HDFS IO throttling
> --------------------------
>
>                 Key: HDFS-4412
>                 URL: https://issues.apache.org/jira/browse/HDFS-4412
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Zhenxiao Luo
>
> When an applications upload/download files from/to HDFS clusters, it would be nice if
the IO could be throttled so that they won't go beyond the specified maximum bandwidth.
> Two options to implement this IO throttling:
> #1. IO Throttling happens at the FSDataInputStream and FSDataOutputStream level.
> Add an IO Throttler to FSDataInputStream/FSDataOutputStram, and whenever an read/write
happens, throttle it first(if throttler is set), then do the actual read/write.
> We may need to add new FileSystem apis to take an IO throttler as input parameter.
> #2. IO Throttling happens at the application level.
> Instead of changing the FSDataInputStream/FSDataOutputStream, all IO throttling is done
at the application level.
> In this approach, FileSystem api remains unchanged.
> Either case, an IO throttler interface is needed, which has a:
> public void throttle(long numOfBytes);
> The current DataTransferThrottler could be an implementation of this IO throttler interface.

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