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From "Anuj (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9146) Ever Growing Secondary Index sstables after every Repair
Date Thu, 09 Apr 2015 11:26:12 GMT
Anuj created CASSANDRA-9146:
-------------------------------

             Summary: Ever Growing Secondary Index sstables after every Repair
                 Key: CASSANDRA-9146
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9146
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: Anuj
            Priority: Blocker


Cluster has reached a state where every "repair -pr" operation on CF results in numerous tiny
sstables being flushed to disk. Most sstables are related to secondary indexes. Due to thousands
of sstables, reads have started timing out. Even though compaction begins for one of the secondary
index, sstable count after repair remains very high (thousands). Every repair adds thousands
of sstables.

Problems:
1. Why burst of tiny secondary index tables are flushed during repair ? What is triggering
frequent/premature flush of secondary index sstable (more than hundred in every burst)? At
max we see one ParNew GC pauses >200ms.

2. Why auto-compaction is not compacting all sstables. Is it related to coldness issue(CASSANDRA-8885)
where compaction doesn't works even when cold_reads_to_omit=0 by default? 
   If coldness is the issue, we are stuck in infinite loop: reads will trigger compaction
but reads timeout as sstable count is in thousands
3. What's the way out if we face this issue in Prod?

Is this issue fixed in latest production release 2.0.13? Issue looks similar to CASSANDRA-8641,
but the issue is fixed in only 2.1.3. I think it should be fixed in 2.0 branch too. 

Configuration:
Compaction Strategy: STCS
memtable_flush_writers=4
memtable_flush_queue_size=4
in_memory_compaction_limit_in_mb=32
concurrent_compactors=12



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