You are viewing a plain text version of this content. The canonical link for it is here.
Posted to common-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2009/05/03 02:55:30 UTC
[jira] Issue Comment Edited: (HADOOP-3799) Design a pluggable
interface to place replicas of blocks in HDFS
[ https://issues.apache.org/jira/browse/HADOOP-3799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705361#action_12705361 ]
dhruba borthakur edited comment on HADOOP-3799 at 5/2/09 5:55 PM:
------------------------------------------------------------------
@Stefan: I completely agree with you. This patch should enable researchers to experiment with various modes of HDFS block placement without changing code-hdfs code. I plan on using this to co-locate blocks from hdfs datasets that are frequently scanner together in a small number of datanodes so that such a "join" operation gets better node/rack locality.
was (Author: dhruba):
@Stefan: I complete agree with you. This patch should enable researchers to experiment with various modes of HDFS block placement without changing code-hdfs code. I plan on using this to co-locate blocks from hdfs datasets that are frequently scanner together in a small number of datanodes so that such a "join" operation gets better node/rack locality.
> Design a pluggable interface to place replicas of blocks in HDFS
> ----------------------------------------------------------------
>
> Key: HADOOP-3799
> URL: https://issues.apache.org/jira/browse/HADOOP-3799
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: BlockPlacementPluggable.txt
>
>
> The current HDFS code typically places one replica on local rack, the second replica on remote random rack and the third replica on a random node of that remote rack. This algorithm is baked in the NameNode's code. It would be nice to make the block placement algorithm a pluggable interface. This will allow experimentation of different placement algorithms based on workloads, availability guarantees and failure models.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.