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https://issues.apache.org/jira/browse/SOLR-7332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14507943#comment-14507943
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Yonik Seeley commented on SOLR-7332:
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bq. Next, I tried increasing the number of reducers I was using to see how hard
I could push Solr and unfortunately, I ended up with 2 shards that had replicas
that were out-of-sync with their leader.
Were there any recoveries or change of leaders during the run?
In a way, this is great that you saw this! Only new adds should significantly
narrow what this could be. Hopefully you'll be able to reproduce.
bq. can you think of a case where docs could be dropped with this new version
bucket seeding stuff?
No... if we accidentally set the version too high, there are no correctness
issues, just extra checks.
If we accidentally set the version too low, then we can fail to drop repeated
or reordered updates. But in your test run, this shouldn't be an issue since
it's only adds. Any old repeats won't change the number of docs (and which
docs) are in the index.
> Seed version buckets with max version from index
> ------------------------------------------------
>
> Key: SOLR-7332
> URL: https://issues.apache.org/jira/browse/SOLR-7332
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Reporter: Timothy Potter
> Assignee: Timothy Potter
> Attachments: SOLR-7332.patch, SOLR-7332.patch, SOLR-7332.patch,
> 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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