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From "Chia-Ping Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16290) Dump summary of callQueue content; can help debugging
Date Mon, 02 Oct 2017 07:34:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16187725#comment-16187725
] 

Chia-Ping Tsai commented on HBASE-16290:
----------------------------------------

bq. I tried above suggestion and have run into an issue. The submit() method of ThreadPoolExecutor
creates a FutureTask using the CallRunner and stores the FutureTask in the workQueue (which
is returned by getQueue). But the FutureTask does not expose CallRunner callable directly
- it is a private member.
The returned {{FutureTask}} is useless for {{FifoRpcScheduler}}, so it is fine to replace
{{ThreadPoolExecutor#submit}} by {{ThreadPoolExecutor#execute}}. No wrap will happen.

> Dump summary of callQueue content; can help debugging
> -----------------------------------------------------
>
>                 Key: HBASE-16290
>                 URL: https://issues.apache.org/jira/browse/HBASE-16290
>             Project: HBase
>          Issue Type: Bug
>          Components: Operability
>    Affects Versions: 2.0.0
>            Reporter: stack
>            Assignee: Sreeram Venkatasubramanian
>              Labels: beginner
>             Fix For: 2.0.0
>
>         Attachments: DebugDump_screenshot.png, HBASE-16290.master.001.patch, HBASE-16290.master.002.patch,
HBASE-16290.master.003.patch, HBASE-16290.master.004.patch, HBASE-16290.master.005.patch,
Sample Summary.txt
>
>
> Being able to get a clue what is in a backedup callQueue could give insight on what is
going on on a jacked server. Just needs to summarize count, sizes, call types. Useful debugging.
In a servlet?



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