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https://issues.apache.org/jira/browse/SOLR-11003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amrit Sarkar updated SOLR-11003:
--------------------------------
    Attachment: SOLR-11003.patch

Varun,

Patch is all set and ready. 

One issue we discussed offline is the {{sleep}} we put after we start CDCR on 
each clusters. CDCR status changes to "started" before setting up LogReader 
pointer on target cluster collection. We can introduce CDCR status "running" in 
near future to accommodate this. Beasts of 100 are passed successfully.

> Enabling bi-directional CDCR on cluster for better failover
> -----------------------------------------------------------
>
>                 Key: SOLR-11003
>                 URL: https://issues.apache.org/jira/browse/SOLR-11003
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: CDCR
>            Reporter: Amrit Sarkar
>            Assignee: Varun Thacker
>         Attachments: SOLR-11003-tlogutils.patch, SOLR-11003.patch, 
> SOLR-11003.patch, SOLR-11003.patch, SOLR-11003.patch, SOLR-11003.patch, 
> SOLR-11003.patch, SOLR-11003.patch, SOLR-11003.patch, SOLR-11003.patch, 
> SOLR-11003.patch, SOLR-11003.patch, sample-configs.zip
>
>
> The latest version of Solr CDCR across collections / clusters is in 
> active-passive format, where we can index into source collection and the 
> updates gets forwarded to the passive one and vice-versa is not supported.
> https://lucene.apache.org/solr/guide/6_6/cross-data-center-replication-cdcr.html
> https://issues.apache.org/jira/browse/SOLR-6273
> We are try to get a  design ready to index in both collections and the 
> updates gets reflected across the collections in real-time (given the backlog 
> of replicating updates to other data center). ClusterACollectionA => 
> ClusterBCollectionB | ClusterBCollectionB => ClusterACollectionA.
> The STRONG RECOMMENDED way to keep indexing in ClusterACollectionA which 
> forwards the updates to ClusterBCollectionB. If ClusterACollectionA gets 
> down, we point the indexer and searcher application to ClusterBCollectionB. 
> Once ClusterACollectionA is up, depending on updates count, they will be 
> bootstrapped or forwarded to ClusterACollectionA from ClusterBCollectionB and 
> keep indexing on the ClusterBCollectionB.



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