Amrit Sarkar commented on SOLR-12057:

Thank you [~WebHomer], this is very useful information. I will try to cook a 
tests-patch proving CDCR doesn't work with tlogs.

> CDCR does not replicate to Collections with TLOG Replicas
> ---------------------------------------------------------
>                 Key: SOLR-12057
>                 URL: https://issues.apache.org/jira/browse/SOLR-12057
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: CDCR
>    Affects Versions: 7.2
>            Reporter: Webster Homer
>            Priority: Major
> We created a collection using TLOG replicas in our QA clouds.
> We have a locally hosted solrcloud with 2 nodes, all our collections have 2 
> shards. We use CDCR to replicate the collections from this environment to 2 
> data centers hosted in Google cloud. This seems to work fairly well for our 
> collections with NRT replicas. However the new TLOG collection has problems.
> The google cloud solrclusters have 4 nodes each (3 separate Zookeepers). 2 
> shards per collection with 2 replicas per shard.
> We never see data show up in the cloud collections, but we do see tlog files 
> show up on the cloud servers. I can see that all of the servers have cdcr 
> started, buffers are disabled.
> The cdcr source configuration is:
> "requestHandler":{"/cdcr":{
>       "name":"/cdcr",
>       "class":"solr.CdcrRequestHandler",
>       "replica":[
>         {
> "zkHost":"[xxx-mzk01.sial.com:2181|http://xxx-mzk01.sial.com:2181/],[xxx-mzk02.sial.com:2181|http://xxx-mzk02.sial.com:2181/],[xxx-mzk03.sial.com:2181/solr|http://xxx-mzk03.sial.com:2181/solr]";,
>           "source":"b2b-catalog-material-180124T",
>           "target":"b2b-catalog-material-180124T"},
>         {
> "zkHost":"[yyyy-mzk01.sial.com:2181|http://yyyy-mzk01.sial.com:2181/],[yyyy-mzk02.sial.com:2181|http://yyyy-mzk02.sial.com:2181/],[yyyy-mzk03.sial.com:2181/solr|http://yyyy-mzk03.sial.com:2181/solr]";,
>           "source":"b2b-catalog-material-180124T",
>           "target":"b2b-catalog-material-180124T"}],
>       "replicator":{
>         "threadPoolSize":4,
>         "schedule":500,
>         "batchSize":250},
>       "updateLogSynchronizer":\{"schedule":60000}}}}
> The target configurations in the 2 clouds are the same:
> "requestHandler":{"/cdcr":{ "name":"/cdcr", 
> "class":"solr.CdcrRequestHandler", "buffer":{"defaultState":"disabled"}}} 
> All of our collections have a timestamp field, index_date. In the source 
> collection all the records have a date of 2/28/2018 but the target 
> collections have a latest date of 1/26/2018
> I don't see cdcr errors in the logs, but we use logstash to search them, and 
> we're still perfecting that. 
> We have a number of similar collections that behave correctly. This is the 
> only collection that is a TLOG collection. It appears that CDCR doesn't 
> support TLOG collections.
> It looks like the data is getting to the target servers. I see tlog files 
> with the right timestamps. Looking at the timestamps on the documents in the 
> collection none of the data appears to have been loaded.In the solr.log I see 
> lots of /cdcr messages  action=LASTPROCESSEDVERSION,  
> no errors
> Target collections autoCommit is set to  60000 I tried sending a commit 
> explicitly no difference. cdcr is uploading data, but no new data appears in 
> the collection.

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