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Posted to common-dev@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2007/07/17 20:46:04 UTC

[jira] Commented: (HADOOP-1595) Add an option to setReplication method to wait for completion of replication

    [ https://issues.apache.org/jira/browse/HADOOP-1595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12513323 ] 

Hairong Kuang commented on HADOOP-1595:
---------------------------------------

The code looks good. The only thing that I am concerned about is its efficiency. The code checks if a block is fully replicated by asking the block's locations from a namenode. This requires a request to the namenode for each block. I think it would be more efficient if we get all blocks' locations of a file in one request.

> Add an option to setReplication method to wait for completion of replication 
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-1595
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1595
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.14.0
>            Reporter: Christian Kunz
>         Attachments: 1595_20070716b.patch
>
>
> Currently setReplication requested by a client returns immediately, without waiting for completion of replication. There are situations where the client would like to know when the replication is actually done.
> This option should be available in fs shell and libhdfs (see HADOOP-1551).

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