virajjasani commented on a change in pull request #1894:
URL: https://github.com/apache/hbase/pull/1894#discussion_r440239542
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File path: src/main/asciidoc/_chapters/ops_mgt.adoc
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@@ -2629,6 +2629,91 @@ You can use the HBase Shell command `status
'replication'` to monitor the replic
* `status 'replication', 'source'` -- prints the status for each replication
source, sorted by hostname.
* `status 'replication', 'sink'` -- prints the status for each replication
sink, sorted by hostname.
+==== Understanding the output
+
+The command output will vary according to the state of replication. For
example right after a restart
+and if destination peer is not reachable, no replication source threads would
be running,
+so no metrics would get displayed:
+
+----
+hbase01.home:
+SOURCE: PeerID=1
+Normal Queue: 1
+No Reader/Shipper threads runnning yet.
+SINK: TimeStampStarted=1591985197350, Waiting for OPs...
+----
+
+Under normal circumstances, a healthy, active-active replication deployment
would
+show the following:
+
+----
+ hbase01.home:
+ SOURCE: PeerID=1
+ Normal Queue: 1
+ AgeOfLastShippedOp=0, TimeStampOfLastShippedOp=Fri Jun 12 18:49:23
BST 2020, SizeOfLogQueue=1, EditsReadFromLogQueue=1, OpsShippedToTarget=1,
TimeStampOfNextToReplicate=Fri Jun 12 18:49:23 BST 2020, Replication Lag=0
+ SINK: TimeStampStarted=1591983663458, AgeOfLastAppliedOp=0,
TimeStampsOfLastAppliedOp=Fri Jun 12 18:57:18 BST 2020
Review comment:
Just a question: For active-active replication, in order to get peerId
of both clusters (defined in each other), we need to run `status 'replication'`
at both clusters side right?
Getting ageOfLastShipped etc metric values from remote cluster is also not
that easy even if we want to display here.
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