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https://issues.apache.org/jira/browse/HBASE-15205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15144532#comment-15144532
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Anoop Sam John commented on HBASE-15205:
----------------------------------------
{code}
Set<byte[]> families = this.htableDescriptor.getFamiliesKeys();
670 for (byte[] family : families) {
671 if (!replicationScope.containsKey(family)) {
672 int scope = htd.getFamily(family).getScope();
{code}
Instead u can iterate over HTD#getFamilies() so no need to again call
getFamily(fam)
> Do not find the replication scope for every WAL#append()
> --------------------------------------------------------
>
> Key: HBASE-15205
> URL: https://issues.apache.org/jira/browse/HBASE-15205
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Priority: Minor
> Fix For: 2.0.0
>
> Attachments: HBASE-15205.patch, HBASE-15205_1.patch,
> HBASE-15205_2.patch, ScopeWALEdits.jpg, ScopeWALEdits_afterpatch.jpg
>
>
> After the byte[] and char[] the other top contributor for lot of GC (though
> it is only 2.86%) is the UTF_8.newDecoder.
> This happens because for every WAL append we try to calculate the replication
> scope associate with the families associated with the TableDescriptor. I
> think per WAL append doing this is very costly and creates lot of garbage.
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