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https://issues.apache.org/jira/browse/HBASE-25741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17334490#comment-17334490
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Bharath Vissapragada commented on HBASE-25741:
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This bug is due to HBASE-25583, linked it (more discussion in the PR).
> Replication Source still having the replication metrics for peer ID which
> doesn't exist.
> ----------------------------------------------------------------------------------------
>
> Key: HBASE-25741
> URL: https://issues.apache.org/jira/browse/HBASE-25741
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.8.0
> Reporter: Sandeep Pal
> Assignee: Sandeep Pal
> Priority: Major
> Fix For: 1.7.0
>
>
> We have observed that replication source metrics for peer exists on some
> region servers even though peer has been removed. This is because when we
> encounter the NoNodeException in ReplicationSource, it calls the
> `peerRemoved` workflow which should eventually terminate the source and
> removes the source from the source manager. Now, the problem is
> ReplicationSource thread terminates itself and thus the action to removePeer
> is not complete leaving the metrics there forever for source. This is the
> flow, replication source trying to clean wals
> [here|https://github.com/apache/hbase/blob/branch-1/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSource.java#L801]
> and on NoNodeException it calls the
> [peerRemoved|https://github.com/apache/hbase/blob/b231dd620f107b488b88599e16dc846eb856972c/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceManager.java#L244]
> and terminate the source (itself), leaving the terminated source there in
> sourcemanager and not clearing it's
> [metrics|https://github.com/apache/hbase/blob/b231dd620f107b488b88599e16dc846eb856972c/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceManager.java#L645].
>
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