[ 
https://issues.apache.org/jira/browse/HDFS-8041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15564824#comment-15564824
 ] 

Hadoop QA commented on HDFS-8041:
---------------------------------

| (x) *{color:red}-1 overall{color}* |
\\
\\
|| 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} |
\\
\\
|| 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org

Reply via email to