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Date: Fri, 6 Mar 2009 07:49:57 -0800 (PST)
From: "Lei Xu (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4865) Trigger block scans for datanode
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    [ https://issues.apache.org/jira/browse/HADOOP-4865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679623#action_12679623 ] 

Lei Xu commented on HADOOP-4865:
--------------------------------

Brian and I discussed about the throttle when manually scan, we think it is better that the scan process do not affect those map reduce tasks, which can let this process works online. 

However, we may put a flag here to indicate whether user need scan blocks with a throttle or not.

> Trigger block scans for datanode
> --------------------------------
>
>                 Key: HADOOP-4865
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4865
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Brian Bockelman
>         Attachments: manual_block_scan.patch, manual_fsck_scan.patch
>
>
> Provide a mechanism to trigger block scans in a datanode upon request.  Support interfaces for commands sent by the namenode and through the HTTP interface.

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