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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15786) Create DBB backed MSLAB pool
Date Thu, 24 Nov 2016 15:16:58 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anoop Sam John updated HBASE-15786:
-----------------------------------
    Release Note: Added a new config hbase.regionserver.offheap.global.memstore.size using
which one can specify the global off heap limit that all memstores can use.  When this config
is in MSLAB should be turned ON and we will use the entire size for the MSLAB pool. It will
make off heap chunks and pool then. It will behave as if we are working with off heap memstores.
 When this config is having a valid value and MSLAB is turned OFF, the system will just ignore
the offheap size and continue to use global max heap space % for memstores and work with on
heap memstores.

> Create DBB backed MSLAB pool
> ----------------------------
>
>                 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, HBASE-15786_V2.patch, HBASE-15786_V2.patch, HBASE-15786_V3.patch,
HBASE-15786_V4.patch, HBASE-15786_V5.patch, HBASE-15786_V6.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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