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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-16205) When Cells are not copied to MSLAB, deep clone it while adding to Memstore
Date Mon, 11 Jul 2016 06:47:11 GMT
Anoop Sam John created HBASE-16205:
--------------------------------------

             Summary: When Cells are not copied to MSLAB, deep clone it while adding to Memstore
                 Key: HBASE-16205
                 URL: https://issues.apache.org/jira/browse/HBASE-16205
             Project: HBase
          Issue Type: Sub-task
            Reporter: Anoop Sam John
            Assignee: Anoop Sam John


This is imp after HBASE-15180 optimization. After that we the cells flowing in write path
will be backed by the same byte[] where the RPC read the request into. By default we have
MSLAB On and so we have a copy operation while adding Cells to memstore.  This copy might
not be there if
1. MSLAB is turned OFF
2. Cell size is more than a configurable max size. This defaults to 256 KB
3. If the operation is Append/Increment. 

In such cases, we should just clone the Cell into a new byte[] and then add to memstore. 
Or else we keep referring to the bigger byte[] chunk for longer time.



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