Yonik Seeley created SOLR-8372:
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Summary: Canceled recovery can lead to data loss
Key: SOLR-8372
URL: https://issues.apache.org/jira/browse/SOLR-8372
Project: Solr
Issue Type: Bug
Reporter: Yonik Seeley
A recovery via index replication tells the update log to start buffering
updates. If that recovery is canceled for whatever reason by the replica, the
RecoveryStrategy calls ulog.dropBufferedUpdates() which stops buffering and
places the UpdateLog back in active mode. If updates come from the leader
after this point (and before ReplicationStrategy retries recovery), the update
will be processed as normal and added to the transaction log. If the server is
bounced, those last updates to the transaction log look normal (no FLAG_GAP)
and can be used to determine who is more up to date.
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