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https://issues.apache.org/jira/browse/HBASE-16030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15331504#comment-15331504
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Hadoop QA commented on HBASE-16030:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 3s {color}
| {color:red} HBASE-16030 does not apply to master. Rebase required? Wrong
Branch? See https://yetus.apache.org/documentation/0.2.1/precommit-patchnames
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12810718/hbase-16030.patch |
| JIRA Issue | HBASE-16030 |
| Console output |
https://builds.apache.org/job/PreCommit-HBASE-Build/2222/console |
| Powered by | Apache Yetus 0.2.1 http://yetus.apache.org |
This message was automatically generated.
> All Regions are flushed at about same time when MEMSTORE_PERIODIC_FLUSH is
> on, causing flush spike
> --------------------------------------------------------------------------------------------------
>
> Key: HBASE-16030
> URL: https://issues.apache.org/jira/browse/HBASE-16030
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 1.2.1
> Reporter: Tianying Chang
> Assignee: Tianying Chang
> Fix For: 2.0.0, 1.3.0, 1.2.3
>
> Attachments: hbase-16030.patch
>
>
> In our production cluster, we observed that memstore flush spike every hour
> for all regions/RS. (we use the default memstore periodic flush time of 1
> hour).
> This will happend when two conditions are met:
> 1. the memstore does not have enough data to be flushed before 1 hour limit
> reached;
> 2. all regions are opened around the same time, (e.g. all RS are started at
> the same time when start a cluster).
> With above two conditions, all the regions will be flushed around the same
> time at: startTime+1hour-delay again and again.
> We added a flush jittering time to randomize the flush time of each region,
> so that they don't get flushed at around the same time. We had this feature
> running in our 94.7 and 94.26 cluster. Recently, we upgrade to 1.2, found
> this issue still there in 1.2. So we are porting this into 1.2 branch.
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