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From "Karthick Sankarachary (JIRA)" <>
Subject [jira] Created: (LUCENE-2435) A Sharding Split Policy For Load-Sharing Index Writes
Date Sun, 02 May 2010 19:53:55 GMT
A Sharding Split Policy For Load-Sharing Index Writes

                 Key: LUCENE-2435
             Project: Lucene - Java
          Issue Type: New Feature
          Components: Index
    Affects Versions: 3.0.1
            Reporter: Karthick Sankarachary
         Attachments: LUCENE-2435.patch

(Please note that the feature described in LUCENE-2425 is required reading for this issue.)

The sharding split policy builds on the remoting split policy, treating each sub-index as
a shard of the split index. Optionally, the super-index on which the split writer is built
may also be considered to be a shard. The motivation for this policy is to allow a given index
to be partitioned across multiple nodes (that define a cluster), which helps to (a) load-balance
document writes across the nodes in that cluster and (b) serve search requests from a (narrower)
set of sub-indices (that the split rule routes the query to).

Unlike other sharding solutions for Lucene, this approach gives users the ability to (a) pick
and choose the types of directories underlying the mirror, and (b) add/remove shards on the

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