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From "Kevin Weil (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1195) Offer rate limits for replicating data
Date Wed, 09 Jun 2010 04:56:11 GMT
Offer rate limits for replicating data 
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                 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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