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From Susheel Kumar <>
Subject Re: Weird transaction log behavior with CDCR
Date Tue, 17 Apr 2018 15:28:21 GMT
DISABLEBUFFER on source cluster would solve this problem.

On Tue, Apr 17, 2018 at 9:29 AM, Chris Troullis <>

> Hi,
> We are attempting to use CDCR with solr 7.2.1 and are experiencing odd
> behavior with transaction logs. My understanding is that by default, solr
> will keep a maximum of 10 tlog files or 100 records in the tlogs. I assume
> that with CDCR, the records will not be removed from the tlogs until it has
> been confirmed that they have been replicated to the other cluster.
> However, even when replication has finished and the CDCR queue sizes are 0,
> we are still seeing large numbers (50+) and large sizes (over a GB) of
> tlogs sitting on the nodes.
> We are hard committing once per minute.
> Doing a lot of reading on the mailing list, I see that a lot of people were
> pointing to buffering being enabled as the cause for some of these
> transaction log issues. However, we have disabled buffering on both the
> source and target clusters, and are still seeing the issues.
> Also, while some of our indexes replicate very rapidly (millions of
> documents in minutes), other smaller indexes are crawling. If we restart
> CDCR on the nodes then it finishes almost instantly.
> Any thoughts on these behaviors?
> Thanks,
> Chris

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