XDCR or restore from backup entered an endless loop if attempting to overwrite a document which was deleted or expired some time ago with a deleteWithMeta operation. Memory pressure recovery logic (Item expelling) is now skipped when replica rollback is in progress. In rare cases, after a failover or memcached restart, a replica rollback while under memory pressure might have caused a crash in the Data Service. The lastReadSeqno is now Incremented when the client is not collection-aware. ItemExpel has been enhanced to release all the items in a checkpoint when memory conditions allow.Ī rollback loop affected legacy clients when collections were used and a tombstone newer than the last mutation in the default collection was purged. In scenarios such as large average item size, high numbers of replicas or low Bucket quota could result in a data-node entering an unrecoverable Out-of-Memory state. The last item in a replica checkpoint was not expelled.
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