[jira] [Created] (CASSANDRA-21767) Accord: first read of untouched key times out

["Michael Semb Wever (Jira)" <ji...@apache.org>]

Michael Semb Wever created CASSANDRA-21767:
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             Summary: Accord: first read of untouched key times out
                 Key: CASSANDRA-21767
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-21767
             Project: Apache Cassandra
          Issue Type: Bug
          Components: Accord
            Reporter: Michael Semb Wever


On a new cluster I have seen null dereferences of the value returned by  {{SafeCommandStore.get(RoutingKey)}}, at two call sites:

* {{SafeCommandStore.updateManagedCommandsForKey:521}}, invoking {{SafeCommandsForKey.callback}}.
* {{Commands.setDurable:1384}}, invoking {{SafeCommandsForKey.setDurable}} through {{InformDurable}}.

{{AbstractSafeCommandStore.canExecute()}} used a non-null reference as proof that a key was ready. Incremental Cassandra tasks retain references for keys outside their current initialised batch. Those references pass the presence check but {{SafeCommandStore.get(key)}} returns {{null}}.



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