Couchbase Server

Performance Status

06/04/2014

KV

MB-11287: Idle server with 30 empty buckets utilizes more than 2000% CPU

MB-11279: UPR-based rebalance (3 -> 4) is extremely slow due to occasionally slow backfilling

MB-11194: Slow and pausing disk persistence

MB-11143: Avg. BgFetcher wait time is still 5-6 times higher in 3.0 (on slow HDD)

MB-11005: Erlang memory in KV test case with 10 buckets is too high (up to 30GB, leading to OOM situation)

KV

MB-10771: Delta recovery is slower than full recovery. Meanwhile several performance issues encountered.

MB-10679: It takes almost 10 minutes to stop Couchbase service in setup with 10 empty buckets

MB-10370: ep-engine deadlock in write-heavy DGM cases

MB-9676: Dramatically increasing latency of SET operations during rebalance tests

MB-9461: In heavy-DGM (<5%) scenarios with views and high cache miss rate rebalance/client operations can fail due to timed out requests to memcached/ep-engine

XDCR

MB-11281: Lack of "swt low" causes long run queues and inconsistent Erlang performanc
MB-10437: XDCR replication rate drops almost to zero in presence of light write workload on src side
MB-7907: Issues when scaling XDCR on single node

Views

MB-11204: Leaking memory in performance tests with view queries (both memcached and Erlang)
MB-10273: View compaction doesn't catch up in basic non-DGM tests with view queries
MB-9822: One of nodes is too slow during indexing

Windows

MB-10191: CouchDB crashed due to 'Cannot allocate 467078560 bytes of memory (of type "heap").'

MB-9825: Rebalance exited with reason bad_replicas

n1ql

MB-11141: SELECT COUNT(*) ... WHERE should avoid memcached operations
MB-11140: SELECT DISTINCT scans all docs
MB-11048: Range queries result in thousands of GET operations/sec

BACKLOG

Multitenancy
Continuous mobile tests
MongoDB performance testing
More "observe" tests
[SmartOS] + DTrace

Couchbase Server