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https://issues.apache.org/jira/browse/HBASE-24994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17194377#comment-17194377
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Hudson commented on HBASE-24994:
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Results for branch branch-1
[build #23 on
builds.a.o|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-1/23/]:
(x) *{color:red}-1 overall{color}*
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details (if available):
(/) {color:green}+1 general checks{color}
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(x) {color:red}-1 jdk7 checks{color}
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(x) {color:red}-1 source release artifact{color}
-- See build output for details.
> Add hedgedReadOpsInCurThread metric
> -----------------------------------
>
> Key: HBASE-24994
> URL: https://issues.apache.org/jira/browse/HBASE-24994
> Project: HBase
> Issue Type: Improvement
> Components: metrics
> Reporter: Javier Akira Luca de Tena
> Assignee: Javier Akira Luca de Tena
> Priority: Minor
> Fix For: 3.0.0-alpha-1, 1.7.0, 2.4.0
>
>
> When adding Hedged Reads metrics at
> https://issues.apache.org/jira/browse/HBASE-12220, hedgedReadOpsInCurThread
> was not included.
> I wonder if there was any reason to not include them. If not, I will provide
> pull request to include them soon.
>
> Hedged reads use same thread pool for the original read:
>
> [https://github.com/apache/hadoop/blob/0b8464d75227fcee2c6e7f2410377b3d53d3d5f8/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java#L1349-L1357]
> When the executor is full and rejects the task, it will be executed in
> current thread, increasing this metric:
>
> [https://github.com/apache/hadoop/blob/0b8464d75227fcee2c6e7f2410377b3d53d3d5f8/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java#L2913-L2918]
> This metric is very useful to determine if the hedged reads thread pool
> (dfs.client.hedged.read.threadpool.size) is undersized.
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