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Posted to issues@hbase.apache.org by "Wei-Chiu Chuang (JIRA)" <ji...@apache.org> on 2018/04/03 17:46:00 UTC
[jira] [Commented] (HBASE-20337) Update the doc on how to setup
shortcircuit reads; its stale
[ https://issues.apache.org/jira/browse/HBASE-20337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16424346#comment-16424346 ]
Wei-Chiu Chuang commented on HBASE-20337:
-----------------------------------------
I'm wondering if it makes sense to use the "stable" Hadoop doc link instead version "r2.7.3" because eventually HBase will update its dependency on Hadoop. ([https://hadoop.apache.org/docs/r2.7.3/hadoop-project-dist/hadoop-hdfs/ShortCircuitLocalReads.html)] (stable currently maps to hadoop 2.9.0)
{quote}Otherwise, shortcircuit read operates quietly in background. It does not provide metrics so no optics on how effective it is
{quote}
I didn't realize this is the case. Maybe we should add those metrics in Hadoop code.
> Update the doc on how to setup shortcircuit reads; its stale
> ------------------------------------------------------------
>
> Key: HBASE-20337
> URL: https://issues.apache.org/jira/browse/HBASE-20337
> Project: HBase
> Issue Type: Sub-task
> Reporter: stack
> Assignee: stack
> Priority: Major
> Fix For: 2.0.0
>
> Attachments: HBASE-20337.master.001.patch
>
>
> The doc is from another era. Update it. Short-circuit reads can make a big difference.
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