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Posted to hdfs-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2014/07/30 19:44:39 UTC
[jira] [Commented] (HDFS-1094) Intelligent block placement policy
to decrease probability of block loss
[ https://issues.apache.org/jira/browse/HDFS-1094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14079618#comment-14079618 ]
Allen Wittenauer commented on HDFS-1094:
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With pluggable block placement, I'm not sure where we sit with this JIRA.... so.... ping!
> Intelligent block placement policy to decrease probability of block loss
> ------------------------------------------------------------------------
>
> Key: HDFS-1094
> URL: https://issues.apache.org/jira/browse/HDFS-1094
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: dhruba borthakur
> Assignee: Rodrigo Schmidt
> Attachments: calculate_probs.py, failure_rate.py, prob.pdf, prob.pdf
>
>
> The current HDFS implementation specifies that the first replica is local and the other two replicas are on any two random nodes on a random remote rack. This means that if any three datanodes die together, then there is a non-trivial probability of losing at least one block in the cluster. This JIRA is to discuss if there is a better algorithm that can lower probability of losing a block.
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