Amrit Sarkar created SOLR-11069:
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Summary: LASTPROCESSEDVERSION for CDCR (both source and target) is
flawed when buffering is enabled
Key: SOLR-11069
URL: https://issues.apache.org/jira/browse/SOLR-11069
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: CDCR
Affects Versions: 7.0
Reporter: Amrit Sarkar
{{LASTPROCESSEDVERSION}} (a.b.v. LPV) action for CDCR breaks down terribly due
to poorly initialised and maintained buffer log for source cluster core nodes.
If buffer is enabled for cores of either source or target cluster, it return
{{-1}}, *irrespective of number of entries in tlog read by the {{leader}}* node
of each shard of respective collection of respective cluster. Once disabled, it
starts telling us the correct LPV for each core.
Due to the same flawed behavior, Update Log Synchroniser may doesn't work
properly as expected, i.e. provides correct seek to the {{non-leader}} nodes to
advance at. I am not sure whether this is an intended behavior for sync but it
surely doesn't feel right.
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