[jira] [Commented] (HDFS-7967) Reduce the performance impact of the balancer

["Daryn Sharp (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-7967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15799394#comment-15799394 ] 

Daryn Sharp commented on HDFS-7967:
-----------------------------------

Removing stale 2.8 patch (based on earlier version), will repost shortly.

> Reduce the performance impact of the balancer
> ---------------------------------------------
>
>                 Key: HDFS-7967
>                 URL: https://issues.apache.org/jira/browse/HDFS-7967
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HDFS-7967-branch-2.patch
>
>
> The balancer needs to query for blocks to move from overly full DNs.  The block lookup is extremely inefficient.  An iterator of the node's blocks is created from the iterators of its storages' blocks.  A random number is chosen corresponding to how many blocks will be skipped via the iterator.  Each skip requires costly scanning of triplets.
> The current design also only considers node imbalances while ignoring imbalances within the nodes's storages.  A more efficient and intelligent design may eliminate the costly skipping of blocks via round-robin selection of blocks from the storages based on remaining capacity.



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