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From "Will Oberman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4789) CassandraStorage.getNextWide produces corrupt data
Date Wed, 10 Oct 2012 20:49:03 GMT
Will Oberman created CASSANDRA-4789:
---------------------------------------

             Summary: CassandraStorage.getNextWide produces corrupt data
                 Key: CASSANDRA-4789
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4789
             Project: Cassandra
          Issue Type: Bug
          Components: Hadoop
    Affects Versions: 1.1.5
            Reporter: Will Oberman


This took me a while to track down.  I'm seeing the problem when the "key changes" case happens.
 The intended behavior (as far as I can tell) when the key changes is the method returns the
current tuple, and picks up where it left off on the next call to getNextWide().  The problem
I'm seeing is the sometimes the current key advances between method calls, sometimes not.
 "Not" being the correct behavior, since the code is saving the value into an instance variable,
but when the key advances there is a key/value mismatch (the result being the values for two
different keys are being glued together).  I think the problem might be related to keys that
only have a single column???  I'm still trying to track that down to help assist in solving
this case...

Maybe this will be clearer from me pasting a bunch of logging I added to the class.  The log
messages are fairly self documenting (I hope):  

...lots of previous logging...
enter getNextWide
hasNext = true
set key = dVNhbXAxMzQ3ODM1OA%3D%3D
lastRow != null
added 1 items to bag from lastRow
added 1 items to bag from row
hasNext = true
added 1 items to bag from row
hasNext = true
added 1 items to bag from row
hasNext = true
added 1 items to bag from row
hasNext = true
added 1 items to bag from row
hasNext = true
added 1 items to bag from row
hasNext = true
added 1 items to bag from row
hasNext = true
added 1 items to bag from row
hasNext = true
key changed, new key = 669392df09572d0045b964bc65f86a2c
exit getNextWide
enter getNextWide
hasNext = true
//!!!THIS IS THE PROBLEM HERE I THINK!!!
//!!!Usually the key here == key before "exit getNextWide"!!!
set key = 5f900ee4bb1850f8cf387cc3d5fc23ca
//!!! lastRow is data for 669392df09572d0045b964bc65f86a2c !!! 
//!!! but it's being added to key 5f900ee4bb1850f8cf387cc3d5fc23ca !!!
lastRow != null
added 1 items to bag from lastRow
//!!! Here are the real values for 5f900ee4bb1850f8cf387cc3d5fc23ca !!!
added 1 items to bag from row
hasNext = true
added 1 items to bag from row
hasNext = true
key changed, new key = 50438549-cdb6-8c44-f93a-d18d7daeffd8
exit getNextWide
enter getNextWide
hasNext = true
set key = 50438549-cdb6-8c44-f93a-d18d7daeffd8

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