Cao Manh Dat updated SOLR-9835:
    Attachment: SOLR-9835.patch

This is my final patch, cleanup to make the patch more robust. ( all related 
tests are passed, included jepsen tests ).
[~shalinmangar] Can you review this patch?

> Create another replication mode for SolrCloud
> ---------------------------------------------
>                 Key: SOLR-9835
>                 URL: https://issues.apache.org/jira/browse/SOLR-9835
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Cao Manh Dat
>            Assignee: Shalin Shekhar Mangar
>         Attachments: SOLR-9835.patch, SOLR-9835.patch, SOLR-9835.patch, 
> SOLR-9835.patch, SOLR-9835.patch, SOLR-9835.patch, SOLR-9835.patch, 
> SOLR-9835.patch
> The current replication mechanism of SolrCloud is called state machine, which 
> replicas start in same initial state and for each input, the input is 
> distributed across replicas so all replicas will end up with same next state. 
> But this type of replication have some drawbacks
> - The commit (which costly) have to run on all replicas
> - Slow recovery, because if replica miss more than N updates on its down 
> time, the replica have to download entire index from its leader.
> So we create create another replication mode for SolrCloud called state 
> transfer, which acts like master/slave replication. In basically
> - Leader distribute the update to other replicas, but the leader only apply 
> the update to IW, other replicas just store the update to UpdateLog (act like 
> replication).
> - Replicas frequently polling the latest segments from leader.
> Pros:
> - Lightweight for indexing, because only leader are running the commit, 
> updates.
> - Very fast recovery, replicas just have to download the missing segments.
> To use this new replication mode, a new collection must be created with an 
> additional parameter {{liveReplicas=1}}
> {code}
> http://localhost:8983/solr/admin/collections?action=CREATE&name=newCollection&numShards=2&replicationFactor=1&liveReplicas=1
> {code}

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