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https://issues.apache.org/jira/browse/HBASE-24545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134851#comment-17134851
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Hudson commented on HBASE-24545:
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Results for branch master
[build #1756 on
builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/master/1756/]: (/)
*{color:green}+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/1756/General_20Nightly_20Build_20Report/]
(x) {color:red}-1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2)
report|https://builds.apache.org/job/HBase%20Nightly/job/master/1663//JDK8_Nightly_Build_Report_(Hadoop2)/]
(/) {color:green}+1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://builds.apache.org/job/HBase%20Nightly/job/master/1756/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 jdk11 hadoop3 checks{color}
-- For more information [see jdk11
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(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test{color}
> Add backoff to SCP check on WAL split completion
> ------------------------------------------------
>
> Key: HBASE-24545
> URL: https://issues.apache.org/jira/browse/HBASE-24545
> Project: HBase
> Issue Type: Bug
> Reporter: Michael Stack
> Assignee: Michael Stack
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.3.0
>
>
> Crashed cluster. Lots of backed up WALs. Startup. Recover hundreds of
> servers; each has a running SCP. Taking a thread dump during recovery, I
> noticed that there were 160 threads each in SCP waiting on split WAL
> completion. Each thread was scanning zk splitWAL directory every 100ms. The
> dir had thousands of entries in it so each check was pulling down MB from
> zk... * 160 (max configured PE threads (16) * 10 for the KeepAlive factor
> that has us do 10 * configured PEs as max for PE worker pool).
> If lots of remaining WALs to split, have the SCP backoff on its wait so it
> checks less frequently.
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