[jira] [Updated] (SOLR-3755) shard splitting

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-3755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shalin Shekhar Mangar updated SOLR-3755:
----------------------------------------

    Attachment: SOLR-3755-combined.patch

Attached is a first iteration of the patch. It is not working yet but a lot of the pieces required for this feature are coming together in this patch. Soon, I'd like to split it into smaller, committable issues/patches.

This is a very rough cut but any comments/suggestions on the general approach and/or the patch will be very helpful.

Changes:
* OverseerCollectionProcessor has a new command called splitshard which executes the whole strategy
* Implicit support for creating new shards (by creating a core with a new shard in "construction" state)
* "Construction" state is introduced for shards
* CoreAdmin has a new APPLYBUFFEREDUPDATES task which, as the name says, instructs a core to apply all buffered updates

TODO:
* Create replicas for new sub-shards
* Figure out how and where to set sub-shards as active and divert traffic away from parent shard
* Tests (both unit and ChaosMonkey based)

Right now, I'm running into a bug where the first sub-shard creation goes through but the second sub-shard coreadmin "CREATE" command blocks in .ShardLeaderElectionContext.waitForReplicasToComeUp(ElectionContext.java:326)

Can anyone tell me what I've overlooked?
                
> shard splitting
> ---------------
>
>                 Key: SOLR-3755
>                 URL: https://issues.apache.org/jira/browse/SOLR-3755
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud
>            Reporter: Yonik Seeley
>         Attachments: SOLR-3755-combined.patch, SOLR-3755-CoreAdmin.patch, SOLR-3755.patch, SOLR-3755.patch, SOLR-3755-testSplitter.patch, SOLR-3755-testSplitter.patch
>
>
> We can currently easily add replicas to handle increases in query volume, but we should also add a way to add additional shards dynamically by splitting existing shards.

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