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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-636) SafeMode should count only complete blocks.
Date Mon, 21 Sep 2009 18:44:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12757990#action_12757990
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Tsz Wo (Nicholas), SZE commented on HDFS-636:
---------------------------------------------

> HDFS-636. Merge -r 815965:816988 from trunk to the append branch.

Hi Konstantin, trunk is now 0.22.  We should only merge 0.21 to to the append branch but not
trunk.

> SafeMode should count only complete blocks.
> -------------------------------------------
>
>                 Key: HDFS-636
>                 URL: https://issues.apache.org/jira/browse/HDFS-636
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: Append Branch
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: Append Branch
>
>         Attachments: completeBlockTotal.patch
>
>
> During start up the name-node is in safe mode and is counting blocks reported by data-nodes.
When the number of minimally replicated blocks reaches the configured threshold the name-node
leaves safe mode. Currently all blocks are counted towards the threshold including the ones
that are under construction. The under-construction blocks should be excluded from the count,
because they need to be recovered, which may take long time (lease expires in 1 hour by default).
Also the recovery may result in deleting those blocks so counting them in the blocks total
is incorrect.

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