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https://issues.apache.org/jira/browse/HDFS-8041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15564824#comment-15564824
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Hadoop QA commented on HDFS-8041:
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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 4s{color}
| {color:red} HDFS-8041 does not apply to trunk. Rebase required? Wrong Branch?
See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-8041 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12724011/HDFS-8041.v4.patch |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/17097/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT http://yetus.apache.org |
This message was automatically generated.
> Consider remaining space during block blockplacement if dfs space is highly
> utilized
> ------------------------------------------------------------------------------------
>
> Key: HDFS-8041
> URL: https://issues.apache.org/jira/browse/HDFS-8041
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Labels: BlockPlacementPolicy
> Attachments: HDFS-8041.v1.patch, HDFS-8041.v2.patch,
> HDFS-8041.v3.patch, HDFS-8041.v4.patch
>
>
> This feature is helpful in avoiding smaller nodes (i.e. heterogeneous
> environment) getting constantly being full when the overall space utilization
> is over a certain threshold. When the utilization is low, balancer can keep
> up, but once the average per-node byte goes over the capacity of the smaller
> nodes, they get full so quickly even after perfect balance.
> This jira proposes an improvement that can be optionally enabled in order to
> slow down the rate of space usage growth of smaller nodes if the overall
> storage utilization is over a configured threshold. It will not replace
> balancer, rather will help balancer keep up. Also, the primary replica
> placement will not be affected. Only the replicas typically placed in a
> remote rack will be subject to this check.
> The appropriate threshold is cluster configuration specific. There is no
> generally good value to set, thus it is disabled by default. We have seen
> cases where the threshold of 85% - 90% would help. Figuring when
> {{totalSpaceUsed / numNodes}} becomes close to the capacity of a smaller node
> is helpful in determining the threshold.
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