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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1195) Offer rate limits for replicating data
Date Wed, 09 Jun 2010 15:02:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12877097#action_12877097
] 

Allen Wittenauer commented on HDFS-1195:
----------------------------------------

I think the rate is currently tied to the heartbeat, IIRC.

> Offer rate limits for replicating data 
> ---------------------------------------
>
>                 Key: HDFS-1195
>                 URL: https://issues.apache.org/jira/browse/HDFS-1195
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 0.20.2
>         Environment: Linux, Hadoop 0.20.1 CDH
>            Reporter: Kevin Weil
>
> If a rack of Hadoop nodes goes down, there is a lot of data to re-replicate.  It would
be great to have a configuration option to rate-limit the amount of bandwidth used for re-replication
so as not to saturate network backlinks.  There is a similar option for rate limiting the
speed at which a DFS rebalance takes place: dfs.balance.bandwidthPerSec.

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