[
https://issues.apache.org/jira/browse/HDFS-12136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16607968#comment-16607968
]
Hadoop QA commented on HDFS-12136:
----------------------------------
| (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 5s{color}
| {color:red} HDFS-12136 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-12136 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12877142/HDFS-12136.trunk.patch
|
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/25007/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> BlockSender performance regression due to volume scanner edge case
> ------------------------------------------------------------------
>
> Key: HDFS-12136
> URL: https://issues.apache.org/jira/browse/HDFS-12136
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.8.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HDFS-12136.branch-2.patch, HDFS-12136.trunk.patch
>
>
> HDFS-11160 attempted to fix a volume scan race for a file appended mid-scan
> by reading the last checksum of finalized blocks within the {{BlockSender}}
> ctor. Unfortunately it's holding the exclusive dataset lock to open and read
> the metafile multiple times Block sender instantiation becomes serialized.
> Performance completely collapses under heavy disk i/o utilization or high
> xceiver activity. Ex. lost node replication, balancing, or decommissioning.
> The xceiver threads congest creating block senders and impair the heartbeat
> processing that is contending for the same lock. Combined with other lock
> contention issues, pipelines break and nodes sporadically go dead.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
