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Limit the number of entries in the cache

Vincent Sellier requested to merge generated-differential-D8040-source into generated-differential-D8040-target

The implementation test after each revision if there are more than 100 000 entries of any kind in the cache. If yes, it flush the content. It's quite naive but the memory seems to stay around 5Go max on big repositories like linux.

This can be still an issue with the current zeromq client because the origin are sorted by repositories a lot of snapshots of big repositories can be ingested in parallel. With the journal implementation, it should be more distributed on repositories of different sizes

Related to swh/infra/sysadm-environment#4313 (closed)

Migrated from D8040 (view on Phabricator)

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