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https://issues.apache.org/jira/browse/SOLR-9241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15343228#comment-15343228
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Trey Grainger commented on SOLR-9241:
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I'm also very excited to see this patch. For the next evolution of Solr's
scalability (and ultimately auto-scaling), these are exactly the kinds of core
capabilities we need for seamlessly scaling up/down, resharding, and
redistributing shards and replicas across a cluster.
The smart merge looks interesting - seems like effectively a way to index into
a larger number of shards (for indexing throughput) while merging them into a
smaller number of shards for searching, enabling scaling of indexing and
searching resourced independently. This obviously won't work well with
Near-Realtime Searching, but I'd be curious to hear more explanation about how
this works in practice for SolrCloud clusters that don't need NRT search.
Agreed with Joel's comments about the update to trunk vs. 4.6.1. One thing that
seems to have been added since 4.6.1 that probably overlaps with this patch is
the Replica Placement Strategies (SOLR-6220) vs. the Allocation Strategies
implemented here.
The rest of the patch seems like all new objects that don't overlap much with
the current code base. Would be interesting to know how much has changed
between 4.6.1 to 6.1 collections/SolrCloud-wise that would create conflicts
with this patch. Am obviously hoping not too much...
Either way, very excited about the contribution and about the potential for
getting these capabilities integrated into Solr.
> Rebalance API for SolrCloud
> ---------------------------
>
> Key: SOLR-9241
> URL: https://issues.apache.org/jira/browse/SOLR-9241
> 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
> http://engineering.bloomreach.com/solrcloud-rebalance-api/) , 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 :
> http://engineering.bloomreach.com/solrcloud-rebalance-api/
> 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:
> ====================
> https://github.com/bloomreach/solrcloud-rebalance-api
> Contributors:
> =====================
> Nitin Sharma
> Suruchi Shah
> Questions/Comments:
> =====================
> You can reach me at nitin.sha...@bloomreach.com
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