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Posted to common-dev@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2008/11/21 00:04:44 UTC

[jira] Commented: (HADOOP-4701) Improve datanode decommission monitoring performance

    [ https://issues.apache.org/jira/browse/HADOOP-4701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649524#action_12649524 ] 

Konstantin Shvachko commented on HADOOP-4701:
---------------------------------------------

Copying from HADOOP-4061 here.
counts down decommissioned blocks as they are replicated. Then there is no need to scan all blocks to verify the node is decommissioned, just check the counter. We can add the total block scan as a sanity check in stopDecommission(). The counter can also be a good indicator of how much decommissioning progress has been done at every moment.

> Improve datanode decommission monitoring performance
> ----------------------------------------------------
>
>                 Key: HADOOP-4701
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4701
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>
> The datanode decommission monitoring is not efficient.  There are rooms for improvement.

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