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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17161) MOB : Make ref cell creation more efficient
Date Tue, 22 Nov 2016 18:52:58 GMT
Anoop Sam John created HBASE-17161:
--------------------------------------

             Summary: MOB : Make ref cell creation more efficient
                 Key: HBASE-17161
                 URL: https://issues.apache.org/jira/browse/HBASE-17161
             Project: HBase
          Issue Type: Improvement
            Reporter: Anoop Sam John
            Assignee: Anoop Sam John
             Fix For: 2.0.0


When we flush MOB data, ref cells are created per actual MOB cell. This creates lots of garbage
Refer MobUtils#createMobRefCell
We need to add 2 tags into the ref cell. An ArrayList is created with default size creating
ref array. Call to CellUtil.getTags will create a new ArrayList even if the original cell
is having no tags.
A new KV is created which will create a new backing byte[] and do copy.  Also along with each
of the flush/compaction op, a fresh Tag object is created for TableName tag.
Fixes include
1. A table name tag is not going to change per HStore.  Even both the new tags to be added.
 Will keep a byte[] of these 2 tags at MobHStore level so that all flush and compactions in
this store can use it.
2. Create a new MobRefCell just like TagRewriteCell where only value and tags part will be
diff from the original cell.





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