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https://issues.apache.org/jira/browse/HBASE-9531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073559#comment-14073559
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Andrew Purtell commented on HBASE-9531:
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Ok, I'm going to commit this to 0.98+ in a few hours unless objection.
> a command line (hbase shell) interface to retreive the replication metrics
> and show replication lag
> ---------------------------------------------------------------------------------------------------
>
> Key: HBASE-9531
> URL: https://issues.apache.org/jira/browse/HBASE-9531
> Project: HBase
> Issue Type: New Feature
> Components: Replication
> Affects Versions: 0.99.0
> Reporter: Demai Ni
> Assignee: Demai Ni
> Fix For: 0.99.0, 0.98.5
>
> Attachments: HBASE-9531-master-v1.patch, HBASE-9531-master-v1.patch,
> HBASE-9531-master-v1.patch, HBASE-9531-trunk-v0.patch,
> HBASE-9531-trunk-v0.patch
>
>
> This jira is to provide a command line (hbase shell) interface to retreive
> the replication metrics info such as:ageOfLastShippedOp,
> timeStampsOfLastShippedOp, sizeOfLogQueue ageOfLastAppliedOp, and
> timeStampsOfLastAppliedOp. And also to provide a point of time info of the
> lag of replication(source only)
> Understand that hbase is using Hadoop
> metrics(http://hbase.apache.org/metrics.html), which is a common way to
> monitor metric info. This Jira is to serve as a light-weight client
> interface, comparing to a completed(certainly better, but heavier)GUI
> monitoring package. I made the code works on 0.94.9 now, and like to use this
> jira to get opinions about whether the feature is valuable to other
> users/workshop. If so, I will build a trunk patch.
> All inputs are greatly appreciated. Thank you!
> The overall design is to reuse the existing logic which supports hbase shell
> command 'status', and invent a new module, called ReplicationLoad. In
> HRegionServer.buildServerLoad() , use the local replication service objects
> to get their loads which could be wrapped in a ReplicationLoad object and
> then simply pass it to the ServerLoad. In ReplicationSourceMetrics and
> ReplicationSinkMetrics, a few getters and setters will be created, and ask
> Replication to build a "ReplicationLoad". (many thanks to Jean-Daniel for
> his kindly suggestions through dev email list)
> the replication lag will be calculated for source only, and use this formula:
> {code:title=Replication lag|borderStyle=solid}
> if sizeOfLogQueue != 0 then max(ageOfLastShippedOp, (current time -
> timeStampsOfLastShippedOp)) //err on the large side
> else if (current time - timeStampsOfLastShippedOp) < 2*
> ageOfLastShippedOp then lag = ageOfLastShippedOp // last shipped happen
> recently
> else lag = 0 // last shipped may happens last night, so NO real lag
> although ageOfLastShippedOp is non-zero
> {code}
> External will look something like:
> {code:title=status 'replication'|borderStyle=solid}
> hbase(main):001:0> status 'replication'
> version 0.94.9
> 3 live servers
> hdtest017.svl.ibm.com:
> SOURCE:PeerID=1, ageOfLastShippedOp=14, sizeOfLogQueue=0,
> timeStampsOfLastShippedOp=Wed Sep 04 14:49:48 PDT 2013
> SINK :AgeOfLastAppliedOp=0, TimeStampsOfLastAppliedOp=Wed Sep 04
> 14:48:48 PDT 2013
> hdtest018.svl.ibm.com:
> SOURCE:PeerID=1, ageOfLastShippedOp=0, sizeOfLogQueue=0,
> timeStampsOfLastShippedOp=Wed Sep 04 14:48:48 PDT 2013
> SINK :AgeOfLastAppliedOp=14, TimeStampsOfLastAppliedOp=Wed Sep 04
> 14:50:59 PDT 2013
> hdtest015.svl.ibm.com:
> SOURCE:PeerID=1, ageOfLastShippedOp=0, sizeOfLogQueue=0,
> timeStampsOfLastShippedOp=Wed Sep 04 14:48:48 PDT 2013
> SINK :AgeOfLastAppliedOp=0, TimeStampsOfLastAppliedOp=Wed Sep 04
> 14:48:48 PDT 2013
> hbase(main):002:0> status 'replication','source'
> version 0.94.9
> 3 live servers
> hdtest017.svl.ibm.com:
> SOURCE:PeerID=1, ageOfLastShippedOp=14, sizeOfLogQueue=0,
> timeStampsOfLastShippedOp=Wed Sep 04 14:49:48 PDT 2013
> hdtest018.svl.ibm.com:
> SOURCE:PeerID=1, ageOfLastShippedOp=0, sizeOfLogQueue=0,
> timeStampsOfLastShippedOp=Wed Sep 04 14:48:48 PDT 2013
> hdtest015.svl.ibm.com:
> SOURCE:PeerID=1, ageOfLastShippedOp=0, sizeOfLogQueue=0,
> timeStampsOfLastShippedOp=Wed Sep 04 14:48:48 PDT 2013
> hbase(main):003:0> status 'replication','sink'
> version 0.94.9
> 3 live servers
> hdtest017.svl.ibm.com:
> SINK :AgeOfLastAppliedOp=0, TimeStampsOfLastAppliedOp=Wed Sep 04
> 14:48:48 PDT 2013
> hdtest018.svl.ibm.com:
> SINK :AgeOfLastAppliedOp=14, TimeStampsOfLastAppliedOp=Wed Sep 04
> 14:50:59 PDT 2013
> hdtest015.svl.ibm.com:
> SINK :AgeOfLastAppliedOp=0, TimeStampsOfLastAppliedOp=Wed Sep 04
> 14:48:48 PDT 2013
> hbase(main):003:0> status 'replication','lag'
> version 0.94.9
> 3 live servers
> hdtest017.svl.ibm.com: lag = 0
> hdtest018.svl.ibm.com: lag = 14
> hdtest015.svl.ibm.com: lag = 0
> {code}
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