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https://issues.apache.org/jira/browse/HBASE-24859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandeep Pal updated HBASE-24859:
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Description:
It has been observed that when the table has too many regions, MR jobs consume
more memory in the client. This is because we keep the region level information
in memory and the memory heavy object is TableSplit because of the Scan object
as a part of it.
We can optimize the memory consumption by not loading the region level
information if the region is empty based on the configuration.
The default configuration can lead to all TableSplits in memory (no change from
the current), but the configuration can enable the map-reduce job to ignore the
empty regions. The configuration can be a part of MR job based.
was:
It has been observed that when the table has too many regions, MR jobs consume
more memory in the client. This is because we keep the region level information
in memory and the memory heavy object is TableSplit because of Scan object as a
part of it.
We can optimize the memory consumption by not loading the region level
information if the region is empty.
> Remove the empty regions from the hbase mapreduce splits
> --------------------------------------------------------
>
> Key: HBASE-24859
> URL: https://issues.apache.org/jira/browse/HBASE-24859
> Project: HBase
> Issue Type: Improvement
> Components: mapreduce
> Reporter: Sandeep Pal
> Assignee: Sandeep Pal
> Priority: Major
> Attachments: hbase-24859.png, screenshot-1.png
>
>
> It has been observed that when the table has too many regions, MR jobs
> consume more memory in the client. This is because we keep the region level
> information in memory and the memory heavy object is TableSplit because of
> the Scan object as a part of it.
> We can optimize the memory consumption by not loading the region level
> information if the region is empty based on the configuration.
> The default configuration can lead to all TableSplits in memory (no change
> from the current), but the configuration can enable the map-reduce job to
> ignore the empty regions. The configuration can be a part of MR job based.
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