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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-2552) ReadResponseResolver Race
Date Mon, 25 Apr 2011 01:22:05 GMT
ReadResponseResolver Race
-------------------------

                 Key: CASSANDRA-2552
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2552
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: Stu Hood
            Assignee: Stu Hood
             Fix For: 0.8.0


When receiving a response, ReadResponseResolver uses a 3 step process to decide whether to
trigger the condition that enough responses have arrived:
# Add new response
# Check response set size
# Check that data is present

I think that these steps must have been reordered by the compiler in some cases, because I
was able to reproduce a case where the condition is not properly triggered:
{noformat}
INFO [RequestResponseStage:15] 2011-04-25 00:26:53,514 ReadResponseResolver.java (line 87)
post append for 1087367065: hasData=false in 2 messages
INFO [RequestResponseStage:8] 2011-04-25 00:26:53,514 ReadResponseResolver.java (line 87)
post append for 1087367065: hasData=true in 1 messages
INFO [pool-1-thread-54] 2011-04-25 00:27:03,516 StorageProxy.java (line 623) Read timeout:
java.util.concurrent.TimeoutException: ReadResponseResolver@1087367065(/10.34.131.109=false,/10.34.132.122=true,)
{noformat}
The last line shows that both results were present, and that one of them was holding data.

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