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From "Boris Yen (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-3006) Enormous counter
Date Tue, 09 Aug 2011 09:42:28 GMT
Enormous counter 

                 Key: CASSANDRA-3006
             Project: Cassandra
          Issue Type: Bug
    Affects Versions: 0.8.3
         Environment: ubuntu 10.04
            Reporter: Boris Yen

I have two-node cluster with the following keyspace and column family settings.

Cluster Information:
   Snitch: org.apache.cassandra.locator.SimpleSnitch
   Partitioner: org.apache.cassandra.dht.RandomPartitioner
   Schema versions: 
	63fda700-c243-11e0-0000-2d03dcafebdf: [,]

Keyspace: test:
  Replication Strategy: org.apache.cassandra.locator.NetworkTopologyStrategy
  Durable Writes: true
    Options: [datacenter1:2]
  Column Families:
    ColumnFamily: testCounter (Super)
    "APP status information."
      Key Validation Class: org.apache.cassandra.db.marshal.BytesType
      Default column value validator: org.apache.cassandra.db.marshal.CounterColumnType
      Columns sorted by: org.apache.cassandra.db.marshal.BytesType/org.apache.cassandra.db.marshal.BytesType
      Row cache size / save period in seconds: 0.0/0
      Key cache size / save period in seconds: 200000.0/14400
      Memtable thresholds: 1.1578125/1440/247 (millions of ops/MB/minutes)
      GC grace seconds: 864000
      Compaction min/max thresholds: 4/32
      Read repair chance: 1.0
      Replicate on write: true
      Built indexes: []

Then, I use a test program based on hector to add a counter column (testCounter[sc][column])
1000 times. In the middle the adding process, I intentional shut down the node
In addition to that, the test program is smart enough to switch the consistency level from
Quorum to One, so that the following adding actions would not fail. 

After all the adding actions are done, I start the cassandra on, and I use cassandra-cli
to check if the counter is correct on both nodes, and I got a result 1001 which should be
reasonable because hector will retry once. However, when I shut down and after is aware of is down, I try to start the cassandra on
again. Then, I check the counter again, this time I got a result 481387 which is so wrong.

I use 0.8.3 the reproduce this bug, but I think this also happens on 0.8.2 or before also.

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