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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-565) Introduce block committing logic during new block allocation and file close.
Date Tue, 25 Aug 2009 18:31:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747541#action_12747541
] 

Hairong Kuang commented on HDFS-565:
------------------------------------

1. BlockManger#convertLastBlockToUnderConstruction(): why relax the restriction the last block
should not be under construction?
2. FSnamesystem#completeFileInternal and getAdditionalBlock should change the last block's
state to be Committed even if it does not pass the progress check.
3. While commiting a block, if one of its finalized replica does not match the committed len
and generation stamp, the replica should be marked as corrupt.

> Introduce block committing logic during new block allocation and file close.
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-565
>                 URL: https://issues.apache.org/jira/browse/HDFS-565
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs client, name-node
>    Affects Versions: Append Branch
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: Append Branch
>
>         Attachments: CommitBlock.patch
>
>
> {{ClientProtocol}} methods {{addBlock()}} and {{complete()}} need to include additional
parameter - a block, which has been successfully written to data-nodes. By sending this block
to the name-node the client confirms the generation stamp of the block and its length. The
block on the name-node changes its state to committed and will become complete as long as
one of the finalized replicas reported by data-nodes.

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