[jira] [Created] (CASSANDRA-9621) Repair of the SystemDistributed keyspace creates a non-trivial amount of memory pressure

["Sylvain Lebresne (JIRA)" <ji...@apache.org>]

Sylvain Lebresne created CASSANDRA-9621:
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             Summary: Repair of the SystemDistributed keyspace creates a non-trivial amount of memory pressure
                 Key: CASSANDRA-9621
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9621
             Project: Cassandra
          Issue Type: Bug
            Reporter: Sylvain Lebresne
            Assignee: Marcus Eriksson
            Priority: Minor


When a repair without any particular option is triggered, the {{SystemDistributed}} keyspace is repaired for all range, and in particular the {{repair_history}} table. For every range, that table is written and flushed (as part of normal repair), meaning that every range triggers the creation of a new 1MB slab region (this also triggers quite a few compactions that also write and flush {{compaction_progress}} at every start and end).

I don't know how much of a big deal this will be in practice, but I wonder if it's really useful to repair the {{repair_*}} tables by default so maybe we could exclude the SystemDistributed keyspace from default repairs and only repair it if asked explicitly?



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