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https://issues.apache.org/jira/browse/SOLR-8791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15181521#comment-15181521
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David Smiley commented on SOLR-8791:
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Ok; I can see that. Maybe we can have a better error? And maybe it could be
detected that the final schema is what the client was trying to update it to so
no need for an error or warning? Granted maybe that wouldn't be worth the
trouble?
> ManagedIndexSchema has race of schemaZkVersion causing BadVersionException
> --------------------------------------------------------------------------
>
> Key: SOLR-8791
> URL: https://issues.apache.org/jira/browse/SOLR-8791
> Project: Solr
> Issue Type: Bug
> Environment: 7.0 snapshot
> Reporter: David Smiley
>
> I started SolrCloud using a single node, 2 shard, 2 replica per shard setup
> with the data driven schema config. I used {{bin/solr start -c -e cloud}} to
> do this, although I got the same ultimate problem when doing the setup more
> manually. Then I used curl to POST a large CSV file of data. At the end, I
> looked in my logs and I saw this:
> {noformat}
> 465889 INFO (qtp680576081-45) [c:geonames s:shard1 r:core_node4
> x:geonames_shard1_replica2] o.a.s.s.ManagedIndexSchema Persisted managed
> schema version 1 at /configs/data_driven_schema_configs/managed-schema
> 465889 ERROR (qtp680576081-15) [c:geonames s:shard2 r:core_node3
> x:geonames_shard2_replica2] o.a.s.s.ManagedIndexSchema Bad version when
> trying to persist schema using 0 due to:
> org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode =
> BadVersion for /configs/data_driven_schema_configs/managed-schema
> {noformat}
> When viewing my logs in the admin UI, I actually saw the error message around
> ~5 times or so in a row, some from the very same replica.
> disclaimer: I'm using the latest 7.0 snapshot master branch with some patches
> that appear innocently unrelated to this
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