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Type: Task
Resolution: Unresolved
Priority: Major - P3
Fix Version/s: None
Affects Version/s: None
Component/s: None
Labels:

Assigned Teams:

Catalog and Routing
Sprint:
CAR Team 2024-01-08, CAR Team 2024-01-22, CAR Team 2024-02-05, CAR Team 2024-02-19, CAR Team 2024-03-04, CAR Team 2024-04-15, CAR Team 2024-10-14, CAR Team 2024-10-28, CAR Team 2024-11-11, CAR Team 2024-11-25
Story Points:
3

Today, MongoD uses a single CatalogCache and CatalogCacheLoader for both it's shard-role responsibilities (i.e., updating the filtering metadata) and its bespoke router-role support (i.e., routing cross-shard $lookup queries).

As we give MongoD a proper routing support equivalent to the routing facilities MongoS provides, we want to allow the routing layer to use a separate CatalogCache that is backed by a ConfigServerCatalogCacheLoader (CSCCL), so that routing operations do not need to stall waiting for replication. However, the shard-role use of the CatalogCache needs to continue to use CatalogCache backed by ShardServerCatalogCacheLoader (SSCCL), to ensure that the routing table view is consistent between primaries and secondaries on refresh.

To achieve this goal, we'll support two CatalogCache and CatalogCacheLoader instances in each MongoD: one used for routing, and the other for shard-role activities. The use of the shard-role implementation should be very limited (essentially, only to filtering metadata updating). To implement this, we'll introduce a new CatalogCacheAndLoaderBackingShardRole object that encapsulates the shard-role state, and clarify that the CatalogCache available on the grid should be used exclusively for routing.

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State of the art of last Evergreen patch.txt
5 kB
Mar 07 2024 01:48:15 PM UTC

depends on

SERVER-87391 CheckMetadataConsistency may fail to detect a RoutingTableRangeOverlap inconsistency (and return a ConflictingOperationInProgress error instead).

Closed

SERVER-87693 RefineCollectionShardKeyCoordinator should not use filtering metadata cache utilities to fetch routing information

Closed

SERVER-87796 The $_internalOwningShard expression should verify that the cached CollectionRoutingInfo has an initialised routing table before consuming it

Closed

SERVER-85370 Move rename precondition checks away from generic utility API

Closed

SERVER-85525 `collMod` coordinator can get the current shard ID without accessing the catalog cache

Closed

SERVER-86805 Relax asserts on js tests profiling the execution of aggregations with nested lookups

Closed

has to be done before

SERVER-87552 Re-enable blacklisted tests in "replica set endpoint"-related suites

Backlog

has to be finished together with

SERVER-84247 Complete TODO listed in SERVER-82588

Closed

is depended on by

SERVER-86556 CheckMetadataConsistency should ignore deprecated index options

Blocked

SERVER-83433 Add back the test coverage for running db hash and validation check on replica set that is fsync locked and has replica set endpoint enabled

Backlog

SERVER-87555 Re-enable blacklisted tests under the sharding_auto_bootstrap suite

Blocked

SERVER-87692 Concurrency/FSM replication state change tests for embedded router mode

Blocked

SERVER-97261 Remove featureFlagCatalogCacheSplit once 9.0 becomes last-lts

Blocked

SERVER-86163 Ensure upgrades from 7.x to 8.0 handle CatalogCacheLoader changes.

Closed

SERVER-86800 Dedicated statistics for information routing and metadata filtering caches

Closed

SERVER-87131 Support stepdowns suites with the embedded router

Closed

SERVER-82707 Improve CatalogCache eviction policy

Blocked

is related to

SERVER-96903 Throwing when unyielding after sending a remote request may continuously swallow a StaleConfig error

Closed

SERVER-97320 Add more suites to run in the embedded router build variant

In Progress

SERVER-82588 Move CatalogCacheLoader to be a decoration on Service

Closed

SERVER-82589 Move CatalogCache off of the Grid object and onto Service

Closed

SERVER-87780 Dedicated catalog cache for config server's background activities

Closed

SERVER-95392 Revisit all CatalogCache usages in the DDL coordinators

Closed

SERVER-95393 Use a ConfigServerCatalogCacheLoader for the router-role and a ShardServerCatalogCacheLoader for the shard-role

In Code Review

SERVER-95390 Introduce FilteringMetadataCache class for shard_filtering_metadata_refresh.cpp

Closed

SERVER-95391 Remove the CatalogCacheLoader as a decoration of the ServiceContext

Closed

related to

SERVER-84548 Using ShardServerCatalogCacheLoader on configsvr causes excessive WT data handles / memory usage

Closed

(1 depends on, 1 has to be done before, 1 has to be finished together with, 9 is depended on by, 9 is related to, 1 related to)

Assignee:: Pol Pinol

Reporter:: George Wangensteen

Participants:: George Wangensteen, Kshitij Gupta, Pol Pinol

Votes:: 0 Vote for this issue

Watchers:: 19 Start watching this issue

Created:: Dec 15 2023 05:11:36 PM UTC

Updated:: Nov 19 2024 09:45:32 AM UTC

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