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https://issues.apache.org/jira/browse/HBASE-14721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anoop Sam John updated HBASE-14721:
-----------------------------------
Status: Patch Available (was: Open)
> Memstore add cells - Avoid many garbage
> ---------------------------------------
>
> Key: HBASE-14721
> URL: https://issues.apache.org/jira/browse/HBASE-14721
> Project: HBase
> Issue Type: Improvement
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Attachments: HBASE-14721.patch
>
>
> In HRegion# applyFamilyMapToMemstore()
> {code}
> for (int i=0; i < listSize; i++) {
> Cell cell = cells.get(i);
> if (cell.getSequenceId() == 0) {
> CellUtil.setSequenceId(cell, mvccNum);
> }
> Pair<Long, Cell> ret = store.add(cell);
> size += ret.getFirst();
> if(isInReplay) {
> // set memstore newly added cells with replay mvcc number
> CellUtil.setSequenceId(ret.getSecond(), mvccNum);
> }
> }
> {code}
> Previously we used to pass the added Cell reference to some HLog impl classes
> and later on the seqId used to get assigned. Now it looks totally changed.
> For normal put cells, the assign happen before adding to store.
> After addition we can see in replay mode again the mvccNum assign on returned
> cell.. This is not really needed as the seq of seqId assign and add to
> memstore is changed now.
> For the previous way we had to return added Cell also and that is why we were
> creating Pair object.Now we can avoid this so we can avoid creation of one
> Pair object and a wrapper Long object for every Cell add..
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