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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9621) Repair of the SystemDistributed keyspace creates a non-trivial amount of memory pressure
Date Fri, 19 Jun 2015 10:18:00 GMT
Sylvain Lebresne created CASSANDRA-9621:
-------------------------------------------

             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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