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Anoop Sam John commented on HBASE-17161: ---------------------------------------- Yep. I just followed what we were doing . First MOB marker tag and then others. From MOB pov it is better. Will commit if no objections Ram. > 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 > > Attachments: HBASE-17161.patch, HBASE-17161.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)