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https://issues.apache.org/jira/browse/SOLR-11003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078861#comment-16078861
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Varun Thacker commented on SOLR-11003:
--------------------------------------
Hi Amrit,
Patch is looking good!
Let's add some code comments in CDCRTransactionLog and CDCRReplicator.
For example, this change in CDCRTransactionLog is confusing till you look at
CDCRReplicator#isTargetCluster
{code}
if
(cmd.getReq().getParamString().contains(CdcrUpdateProcessor.CDCR_UPDATE)) {
codec.writeTag(JavaBinCodec.ARR, 6);
} else {
codec.writeTag(JavaBinCodec.ARR, 5);
}
{code}
The test has adds, deleteByid and deleteByQuery. Can we also test for in place
updates ( I didn't see a anything triggering that code path )
Also it wouldn't hurt to add atomic updates to the test.
> Enabling bi-directional CDCR active-active clusters
> ---------------------------------------------------
>
> 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: sample-configs.zip, SOLR-11003.patch
>
>
> 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.
> ClusterACollectionA => ClusterBCollectionB | ClusterBCollectionB =>
> ClusterACollectionA.
> The best use-case would be to we 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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