[SOLR-9398] deleteByQuery blocks during an optimize - ASF JIRA

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Details

Type: Bug
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: 5.3.2
Fix Version/s: None
Component/s: None
Labels:
None

Description

When merging is happening, particularly if it's an optimize, a deleteByQuery update request will block until the merge is complete. Any other change to the index is also blocked by the delete.

If a query with fl set to the uniqueKey is made, then the list of IDs received from that query is submitted as a delete by ID, then there's no problem. This suggests that it is probably possible to fix this.

I know for sure that this affects 5.3.2, and I think it likely affects all 6.x versions too. I don't have any large indexes on anything newer than 5.3.2.