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Type: Bug
Resolution: Done
Priority: Major - P3
Fix Version/s: 3.4.4, 3.5.6
Affects Version/s: None
Component/s: Sharding
Labels:
None

Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Backport Requested:

v3.4
Sprint:
Sharding 2016-12-12, Sharding 2017-01-02, Sharding 2017-02-13, Sharding 2017-03-06, Sharding 2017-03-27, Sharding 2017-04-17
Case:

CatalogCache::getDatabase loads database metadata under the CatalogCache's mutex, blocking all operations while the config server query completes. This alone is pretty bad, but at least the CatalogCache shouldn't miss too often (CatalogCache caches database objects, database creation should be relatively infrequent).

Even worse is the reloading of the ChunkManager, which loads the chunk ranges under the DBConfig's mutex. This means that while we are loading the chunk ranges for a collection after a shard version error, all CRUD operations on all (sharded or unsharded) collections in that database will block until the chunk reload is finished.

depends on

SERVER-22611 ChunkManager refresh can occasionally cause a full reload

Closed

SERVER-27321 Rename ScopedChunkManager::getExisting to refreshAndGet

Closed

SERVER-27480 Get rid of ConfigServer class

Closed

SERVER-27526 Get rid of all non-metadata usages of DBConfig::isShardingEnabled

Closed

SERVER-27527 Remove explicit shardingEnabled check for databases in M/R and aggregation

Closed

SERVER-27736 DBConfig should not store unsharded collections

Closed

SERVER-27809 Move split logic outside of the Chunk class

Closed

SERVER-28030 Move 'initial chunks' writes out of ChunkManager

Closed

SERVER-28098 Get rid of DBConfig::getAllShardIds

Closed

SERVER-28106 Cleanup the contract of ChunkManager::findIntersectingChunk

Closed

SERVER-28111 Move parallel.h/parallel.cpp to be under mongo/s/client

Closed

SERVER-27364 Remove DBConfig::setPrimary

Closed

SERVER-27366 Remove DBConfig::enableSharding

Closed

SERVER-27381 Remove DBConfig::dropDatabase

Closed

SERVER-27382 Remove usages of DBConfig::reload

Closed

SERVER-27419 Move cluster 'drop' command to a separate file

Closed

SERVER-27467 Remove double loading of the sharding database metadata entry

Closed

SERVER-27473 Remove writes from DBConfig

Closed

SERVER-27681 Better concurrency control on shard metadata refresh

Closed

SERVER-28155 Cleanup sharding library dependencies

Closed

(15 depends on)

Assignee:: Kaloian Manassiev

Reporter:: Spencer Brody (Inactive)

Participants:: Githook User, Kaloian Manassiev, Spencer Brody

Votes:: 9 Vote for this issue

Watchers:: 28 Start watching this issue

Created:: Oct 09 2015 09:20:59 PM UTC

Updated:: Aug 28 2018 10:11:55 AM UTC

Resolved:: Apr 04 2017 10:53:40 PM UTC

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