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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4116) Balancer should provide better resource management
Date Wed, 24 Sep 2008 00:51:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633984#action_12633984
] 

Konstantin Shvachko commented on HADOOP-4116:
---------------------------------------------

+1.

> Balancer should provide better resource management
> --------------------------------------------------
>
>                 Key: HADOOP-4116
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4116
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.17.0
>            Reporter: Raghu Angadi
>            Assignee: Hairong Kuang
>            Priority: Blocker
>             Fix For: 0.18.2, 0.19.0
>
>         Attachments: balancerRM.patch, balancerRM1.patch
>
>
> The number of threads are currently limited on datanodes. Once these threads are occupied,
DataNode does not accept any more requests (DOS). Recently we saw a case where most of the
256 threads were waiting in {{DataXceiver.replaceBlock()}} trying to acquire  {{balancingSem}}.
 Since rebalancing  is (heavily) throttled, I would think this would be the common case. 
> These operations waiting  for active rebalancing threads to finish need not take up a
thread. 

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