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https://issues.apache.org/jira/browse/SOLR-8372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15051229#comment-15051229
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Mark Miller commented on SOLR-8372:
-----------------------------------
Shard splitting does use it.
There is also a general Solr admin API that start buffering. Looks like migrate
uses that.
> 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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