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From "Timothy Potter (JIRA)" <>
Subject [jira] [Updated] (SOLR-7332) Seed version buckets with max version from index
Date Thu, 02 Apr 2015 16:32:53 GMT


Timothy Potter updated SOLR-7332:
    Attachment: SOLR-7332.patch

Here's an updated patch that isn't ready for commit (needs more concurrent unit tests), but
takes the approach of seeding the version buckets during core initialization. Two main changes:

1) On first searcher (during core initialization), SolrCore calls a new method in UpdateLog
called onFirstSearcher. This does the lookup of the max from the index.

btw - I actually tried just having UpdateLog implement SolrEventListener, but then that led
down a rabbit hole of needing UpdateLog to be SolrCoreAware (to avoid a concurrent mod exception)

One thing I'm seeing with this approach is a multiple on-deck searcher warning after a core
reload, so still tracking that issue down. Wanted to vet out this new approach before doing
that though ...

2) If the version is not found in the index, I seed it with the new clock value ... 

> Seed version buckets with max version from index
> ------------------------------------------------
>                 Key: SOLR-7332
>                 URL:
>             Project: Solr
>          Issue Type: Sub-task
>          Components: SolrCloud
>            Reporter: Timothy Potter
>            Assignee: Timothy Potter
>         Attachments: SOLR-7332.patch, SOLR-7332.patch
> See full discussion with Yonik and I in SOLR-6816.
> The TL;DR of that discussion is that we should initialize highest for each version bucket
to the MAX value of the {{__version__}} field in the index as early as possible, such as after
the first soft- or hard- commit. This will ensure that bulk adds where the docs don't exist
avoid an unnecessary lookup for a non-existent document in the index.

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