MongoDB, slow chunk Migration for collection config.system.sessions with removing Shard - Config server relation
#282
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MiaAltieri
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Nov 2, 2023
## Issue No tests for shard removal ## Solution Add tests for various removal scenarios ## Extras 1. These tests highlighted an issue with slow drainage. A large TIMEOUT period has been added to the tests and an issue (#282 ) has been added to the repo 2. Wait for relation_changed to be given both key and ops password, as these seem to not always be given from the config server on relation-joined. [discussed here](https://chat.charmhub.io/charmhub/pl/prmxufjyfbnt9qrzdrxoxkqz3e)
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Deployment
Sharded Cluster with 3 shards + 1 config server. (Note: each component has replication enabled, but only one replica)
Action
Remove the shard that hosts
config.system.sessionscollectionProblem
Drainage takes 20-25minutes
Context
MongoDB Forum Post
Stack Overflow Post
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