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https://issues.apache.org/jira/browse/SOLR-5324?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shalin Shekhar Mangar updated SOLR-5324:
----------------------------------------

    Attachment: SOLR-5324.patch

Changes:
# Extracted shard splitting related logic in overseer to its own method
# The Overseer.updateShardState is re-used for switching shard state. It also 
takes care of removing parent shard information when a shard is switched from 
'recovery' to 'active' states.

> Make sub shard replica recovery and shard state switch asynchronous
> -------------------------------------------------------------------
>
>                 Key: SOLR-5324
>                 URL: https://issues.apache.org/jira/browse/SOLR-5324
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Shalin Shekhar Mangar
>            Assignee: Shalin Shekhar Mangar
>             Fix For: 4.6, 5.0
>
>         Attachments: SOLR-5324.patch, SOLR-5324.patch, SOLR-5324.patch
>
>
> Currently the shard split command waits for all replicas of all sub shards to 
> recover and then switches the state of parent to inactive and sub-shards to 
> active.
> The problem is that shard split (ab)uses the CoreAdmin WaitForState action to 
> ask the sub shard leader to wait until the replica states are active. This 
> action is prone to timeout.
> We should make the shard state switching asynchronous. Once all replicas of 
> all sub-shards are 'active', the shard states should be switched 
> automatically.



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