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https://issues.apache.org/jira/browse/HBASE-15786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anoop Sam John updated HBASE-15786:
-----------------------------------
Description:
We can make use of MSLAB pool for this off heap memstore.
Right now one can specify the global memstore size (heap size) as a % of max
memory using a config. We will add another config with which one can specify
the global off heap memstore size. This will be exact size not as %. When off
heap memstore in use, we will give this entire area for the MSLAB pool and that
will create off heap chunks. So when cells are added to memstore, the cell data
gets copied into the off heap MSLAB chunk spaces. Note that when the pool size
is not really enough and we need additional chunk creation, we wont use off
heap area for that. We dony want to create so many on demand DBBs.
> Create Offheap Memstore
> -----------------------
>
> Key: HBASE-15786
> URL: https://issues.apache.org/jira/browse/HBASE-15786
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver
> Reporter: ramkrishna.s.vasudevan
> Assignee: Anoop Sam John
> Fix For: 2.0.0
>
> Attachments: HBASE-15786.patch
>
>
> We can make use of MSLAB pool for this off heap memstore.
> Right now one can specify the global memstore size (heap size) as a % of max
> memory using a config. We will add another config with which one can specify
> the global off heap memstore size. This will be exact size not as %. When off
> heap memstore in use, we will give this entire area for the MSLAB pool and
> that will create off heap chunks. So when cells are added to memstore, the
> cell data gets copied into the off heap MSLAB chunk spaces. Note that when
> the pool size is not really enough and we need additional chunk creation, we
> wont use off heap area for that. We dony want to create so many on demand
> DBBs.
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