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https://issues.apache.org/jira/browse/PHOENIX-4910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Elser updated PHOENIX-4910:
--------------------------------
Description:
A user ran into a JVM bug which appears to have caused a RegionServer to crash
while running a topN aggregate query. This left a large number of files in
{{/tmp}} after the RS had gone away (due to a JVM SIGBUS crash).
MappedByteBufferQueue will buffer results in memory up to 20MB by default
(controlled by {{phoenix.query.spoolThresholdBytes}}) and then start appending
them to a file. I'm seeing two things which could be improved:
* If the RS exits abnormally, there is no process to clean up files - would be
nice to register the {{deleteOnExit()}} hook to try to clean these up.
* There is no ability to control where MappedByteBufferQueue writes its spool
file - would be nice to use something other than /tmp (I think we have a
property to control this already in our config..)
FYI [[email protected]]
was:
A user ran into a JVM bug which appears to have caused a RegionServer to crash
while running a topN aggregate query. This left a large number of files in
{{/tmp}} after the RS had gone away (due to a JVM SIGBUS crash).
MappedByteBufferQueue will buffer results in memory up to 20MB by default
(controlled by {{phoenix.query.spoolThresholdBytes}}) and then start appending
them to a file. I'm seeing two things which could be improved:
* If the RS exist abnormally, there is no process to clean up files - would be
nice to register the {{deleteOnExit()}} hook to try to clean these up.
* There is no ability to control where MappedByteBufferQueue writes its spool
file - would be nice to use something other than /tmp (I think we have a
property to control this already in our config..)
FYI [[email protected]]
> Improvements to spooled MappedByteBufferQueue files
> ---------------------------------------------------
>
> Key: PHOENIX-4910
> URL: https://issues.apache.org/jira/browse/PHOENIX-4910
> Project: Phoenix
> Issue Type: Bug
> Reporter: Josh Elser
> Assignee: Josh Elser
> Priority: Major
> Fix For: 4.15.0, 5.1.0
>
> Attachments: PHOENIX-4910.001.patch
>
>
> A user ran into a JVM bug which appears to have caused a RegionServer to
> crash while running a topN aggregate query. This left a large number of files
> in {{/tmp}} after the RS had gone away (due to a JVM SIGBUS crash).
> MappedByteBufferQueue will buffer results in memory up to 20MB by default
> (controlled by {{phoenix.query.spoolThresholdBytes}}) and then start
> appending them to a file. I'm seeing two things which could be improved:
> * If the RS exits abnormally, there is no process to clean up files - would
> be nice to register the {{deleteOnExit()}} hook to try to clean these up.
> * There is no ability to control where MappedByteBufferQueue writes its
> spool file - would be nice to use something other than /tmp (I think we have
> a property to control this already in our config..)
> FYI [[email protected]]
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