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https://issues.apache.org/jira/browse/HDFS-7967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16607967#comment-16607967
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Hadoop QA commented on HDFS-7967:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 8s{color}
| {color:red} HDFS-7967 does not apply to branch-2.8. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-7967 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12847070/HDFS-7967.branch-2.8.003.patch
|
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/25006/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> 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-2.8.patch, HDFS-7967-branch-2.patch,
> HDFS-7967.branch-2-1.patch, HDFS-7967.branch-2.001.patch,
> HDFS-7967.branch-2.002.patch, HDFS-7967.branch-2.8-1.patch,
> HDFS-7967.branch-2.8.001.patch, HDFS-7967.branch-2.8.002.patch,
> HDFS-7967.branch-2.8.003.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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