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From "Joel Bernstein (JIRA)" <>
Subject [jira] [Commented] (SOLR-9241) Rebalance API for SolrCloud
Date Tue, 21 Jun 2016 22:54:57 GMT


Joel Bernstein commented on SOLR-9241:

Very excited to see this patch! 

The ticket has this for 4.6.1. Do you believe it will be difficult to get this working on

One small suggestion, if you name the patch SOLR-9241.patch it will conform to the standard

Thanks for submitting the patch.

> Rebalance API for SolrCloud
> ---------------------------
>                 Key: SOLR-9241
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud
>    Affects Versions: 4.6.1
>         Environment: Ubuntu, Mac OsX
>            Reporter: Nitin Sharma
>              Labels: Cluster, SolrCloud
>             Fix For: 4.6.1
>         Attachments: rebalance.diff
>   Original Estimate: 2,016h
>  Remaining Estimate: 2,016h
> This is the v1 of the patch for Solrcloud Rebalance api (as described in
, built at Bloomreach by Nitin Sharma and Suruchi Shah. The goal of the API  is to provide
a zero downtime mechanism to perform data manipulation and  efficient core allocation in solrcloud.
This API was envisioned to be the base layer that enables Solrcloud to be an auto scaling
platform. (and work in unison with other complementing monitoring and scaling features).
> Patch Status:
> ===============
> The patch is work in progress and incremental. We have done a few rounds of code clean
up. We wanted to get the patch going first to get initial feed back.  We will continue to
work on making it more open source friendly and easily testable.
>  Deployment Status:
> ====================
> The platform is deployed in production at bloomreach and has been battle tested for large
scale load. (millions of documents and hundreds of collections).
>  Internals:
> =============
> The internals of the API and performance :
> It is built on top of the admin collections API as an action (with various flavors).
At a high level, the rebalance api provides 2 constructs:
> Scaling Strategy:  Decides how to move the data.  Every flavor has multiple options which
can be reviewed in the api spec.
> Re-distribute  - Move around data in the cluster based on capacity/allocation.
> Auto Shard  - Dynamically shard a collection to any size.
> Smart Merge - Distributed Mode - Helps merging data from a larger shard setup into smaller
one.  (the source should be divisible by destination)
> Scale up -  Add replicas on the fly
> Scale Down - Remove replicas on the fly
> Allocation Strategy:  Decides where to put the data.  (Nodes with least cores, Nodes
that do not have this collection etc). Custom implementations can be built on top as well.
One other example is Availability Zone aware. Distribute data such that every replica is placed
on different availability zone to support HA.
>  Detailed API Spec:
> ====================
>  Contributors:
> =====================
>   Nitin Sharma
>   Suruchi Shah
>  Questions/Comments:
> =====================
>   You can reach me at

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