[jira] [Commented] (SOLR-2595) Split and migrate indexes

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

    [ https://issues.apache.org/jira/browse/SOLR-2595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049703#comment-13049703 ] 

Shalin Shekhar Mangar commented on SOLR-2595:
---------------------------------------------

Example: Lets say you have a core C1 on host H1 which you want to split and move a part of the index to core C2 on host H2

The sequence of operation can be:
# Use SOLR-2593 to split C1 and move the part to be migrated into a temporary core, say "S"
# Create a temporary core on H2 host, say "T"
# Assign "T" to be a slave of "S"
# When replication completes, use SOLR-2596 to merge "T" into "C2" - perhaps update some ZK flags so that

Some details still need to be figured out e.g.
* What strategy to use for splitting?
* How to delete the migrated part from the source index?
* How to update the shard lookup and distributed indexing schemes for the migrated part?
* What happens to writes during the migration? Should we disallow it?

> Split and migrate indexes
> -------------------------
>
>                 Key: SOLR-2595
>                 URL: https://issues.apache.org/jira/browse/SOLR-2595
>             Project: Solr
>          Issue Type: New Feature
>          Components: multicore, replication (java), SolrCloud
>            Reporter: Shalin Shekhar Mangar
>             Fix For: 4.0
>
>
> When an shard's index grows too large or a shard becomes too loaded, it should be possible to split parts of a shard's index and migrate/merge to a less loaded node.

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