[jira] [Created] (CASSANDRA-16380) KeyCache load performance issue during startup

["Venkata Harikrishna Nukala (Jira)" <ji...@apache.org>]

Venkata Harikrishna Nukala created CASSANDRA-16380:
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             Summary: KeyCache load performance issue during startup
                 Key: CASSANDRA-16380
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16380
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Venkata Harikrishna Nukala
            Assignee: Venkata Harikrishna Nukala


Cassandra startup blocked for loading key cache.

From org.apache.cassandra.service.CassandraDaemon#setup method:
{code:java}
try
{
 loadRowAndKeyCacheAsync().get();
}
catch (Throwable t)
{
 JVMStabilityInspector.inspectThrowable(t);
 logger.warn("Error loading key or row cache", t);
}{code}

Key cache {{deserialize}} method is fetching all CANONICAL SSTables and picks one from it for each entry: https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/service/CacheService.java#L447. When the key cache is relatively big and has lots of SSTables (in thousands) then loading key cache take lots of time.

Performance of key cache loading can be improved and have timeout for it.



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