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https://issues.apache.org/jira/browse/HBASE-21806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16757218#comment-16757218
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Hudson commented on HBASE-21806:
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Results for branch master
[build #759 on
builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/master/759/]: (x)
*{color:red}-1 overall{color}*
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details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://builds.apache.org/job/HBase%20Nightly/job/master/759//General_Nightly_Build_Report/]
(x) {color:red}-1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2)
report|https://builds.apache.org/job/HBase%20Nightly/job/master/759//JDK8_Nightly_Build_Report_(Hadoop2)/]
(x) {color:red}-1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://builds.apache.org/job/HBase%20Nightly/job/master/759//JDK8_Nightly_Build_Report_(Hadoop3)/]
(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test{color}
> add an option to roll WAL on very slow syncs
> --------------------------------------------
>
> Key: HBASE-21806
> URL: https://issues.apache.org/jira/browse/HBASE-21806
> Project: HBase
> Issue Type: Improvement
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Priority: Major
> Fix For: 3.0.0
>
> Attachments: HBASE-21806.patch
>
>
> In large heterogeneous clusters sometimes a slow datanode can cause WAL syncs
> to be very slow. In this case, before the bad datanode recovers, or is
> discovered and repaired, it would be helpful to roll WAL on a very slow sync
> to get a new pipeline.
> Otherwise the slow WAL will impact write latency for a long time (slow writes
> result in less writes result in the WAL not being rolled for longer)
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