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From Stack <st...@duboce.net>
Subject Re: Region Replicas/Timeline Consistent Reads Questions
Date Thu, 29 Aug 2019 19:42:26 GMT
On Tue, Aug 27, 2019 at 11:28 AM Jacob Schlather <jschlather@hubspot.com>
wrote:

> I'm currently working on testing out the timeline consistent feature
>
> https://archive.cloudera.com/cdh5/cdh/5/hbase-0.98.6-cdh5.2.4/book/arch.timelineconsistent.reads.html
> and I
> had a couple of questions.
>
> 1. I setup region replication on a test cluster and everything seemed to be
> working fine. I was doing get requests with timeline consistency and stale
> results were coming back. Then something happened on the cluster and region
> replication appears to be broken. When I look in the jmx endpoint on a
> region server all of the replicas are empty and I added additionally
> debugging information to the RegionServerCallable and the replica regions
> are returning "The region's reads are disabled. Cannot serve the request".
> I couldn't find anything errors that seemed to indicate what was wrong in
> the region server logs. So, I was wondering what else I could do to debug
> this and where I should be looking.
>
>
This is interesting. This happens for any read against any region? Configs
changed under the server and restart? Can you pinpoint when? Seems odd
nothing in logs around this time.



> 2. I've looked through the documentation and I might have missed something.
> But I was wondering if there's any jmx metrics that measure the lag of the
> region replicas or what would have to be done to add these metrics. Hbase
> does expose replication metrics, but these appear to be for inter-cluster
> replication rather than region replicas.
>
>
I don't know of any read replica metrics. If you added any, they'd be
welcome.

Thank Jacob,
S



> Thanks,
> Jacob
>

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