[GitHub] [hbase] bharathv commented on a change in pull request #2193: HBASE-24779 Report on the WAL edit buffer usage/limit for replication

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bharathv commented on a change in pull request #2193:
URL: https://github.com/apache/hbase/pull/2193#discussion_r465146006



##########
File path: hbase-hadoop-compat/src/main/java/org/apache/hadoop/hbase/replication/regionserver/MetricsReplicationSourceSourceImpl.java
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@@ -314,4 +314,15 @@ public String getMetricsName() {
   @Override public long getEditsFiltered() {
     return this.walEditsFilteredCounter.value();
   }
+
+  @Override
+  public void setWALReaderEditsBufferBytes(long usage) {
+    //noop. Global limit, tracked globally. Do not need per-source metrics

Review comment:
       > Once we chuck something into this usage, we have zero insight back to which source put it there.
   
   I had the same question. I was wondering if a drill down by source would be helpful in addition to the global usage. Correct me if I'm wrong, looks like ReplicationSource class has access to the MetricsSource object.. we can just update the byte usage for that source? (and the global too at the same time). That way we can also get rid of the special logic to update one metric setWALReaderEditsBufferBytes(). Does that not work for some reason?




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