Anoop Sam John created HBASE-17161:
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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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