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From Amrit Sarkar <>
Subject Re: CDCR - how to deal with the transaction log files
Date Fri, 21 Jul 2017 13:21:20 GMT

Yes! You created default UpdateLog which got written to a disk and then you
changed it to CdcrUpdateLog in configs. I find no reason it would create a
proper COLLECTIONCHECKPOINT on target tlog.

One thing you can try before creating / starting from scratch is restarting
source cluster nodes, the leaders of shard will try to create the same
COLLECTIONCHECKPOINT, which may or may not be successful.

Amrit Sarkar
Search Engineer
Lucidworks, Inc.

On Fri, Jul 21, 2017 at 11:09 AM, Patrick Hoeffel <> wrote:

> I'm working on my first setup of CDCR, and I'm seeing the same "The log
> reader for target collection {collection name} is not initialised" as you
> saw.
> It looks like you're creating collections on a regular basis, but for me,
> I create it one time and never again. I've been creating the collection
> first from defaults and then applying the CDCR-aware solrconfig changes
> afterward. It sounds like maybe I need to create the configset in ZK first,
> then create the collections, first on the Target and then on the Source,
> and I should be good?
> Thanks,
> Patrick Hoeffel
> Senior Software Engineer
> (Direct)  719-452-7371
> (Mobile) 719-210-3706
> -----Original Message-----
> From: jmyatt []
> Sent: Wednesday, July 12, 2017 4:49 PM
> To:
> Subject: Re: CDCR - how to deal with the transaction log files
> glad to hear you found your solution!  I have been combing over this post
> and others on this discussion board many times and have tried so many
> tweaks to configuration, order of steps, etc, all with absolutely no
> success in getting the Source cluster tlogs to delete.  So incredibly
> frustrating.  If anyone has other pearls of wisdom I'd love some advice.
> Quick hits on what I've tried:
> - solrconfig exactly like Sean's (target and source respectively) expect
> no autoSoftCommit
> - I am also calling cdcr?action=DISABLEBUFFER (on source as well as on
> target) explicitly before starting since the config setting of
> defaultState=disabled doesn't seem to work
> - when I create the collection on source first, I get the warning "The log
> reader for target collection {collection name} is not initialised".  When I
> reverse the order (create the collection on target first), no such warning
> - tlogs replicate as expected, hard commits on both target and source
> cause tlogs to rollover, etc - all of that works as expected
> - action=QUEUES on source reflects the queueSize accurately.  Also
> *always* shows updateLogSynchronizer state as "stopped"
> - action=LASTPROCESSEDVERSION on both source and target always seems
> correct (I don't see the -1 that Sean mentioned).
> - I'm creating new collections every time and running full data imports
> that take 5-10 minutes. Again, all data replication, log rollover, and
> autocommit activity seems to work as expected, and logs on target are
> deleted.  It's just those pesky source tlogs I can't get to delete.
> --
> View this message in context: http://lucene.472066.n3.
> files-tp4345062p4345715.html
> Sent from the Solr - User mailing list archive at

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