AnitEntropy/MerkleTree Error
----------------------------

                 Key: CASSANDRA-3014
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3014
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.8.0
            Reporter: Hefeng Yuan
            Priority: Minor


Hi,

We are seeing some AntiEntropy error in our production servers, since it's hard 
to repro in other env, pasting the stack track here for some clue. 

We're using a cluster of 2 data centers, 9 nodes, 6 for online traffic, 3 for 
Brisk BI. Our RF is Cassandra:5, Brisk:1.

Our Cassandra server version is 0.8.0. Data is written using Hector 0.7.0-20 
and cassandra 0.7.2 library.

Partitioner is random.

Our nodetool repair is scheduled once per week.

The exception stack is appended in the end.

Any help is appreciated.

Thanks,
Hefeng


ERROR [AntiEntropyStage:2] 2011-08-08 04:24:39,556 AbstractCassandraDaemon.java 
(line 113) Fatal exception in thread Thread[AntiEntropyStage:2,5,main]
java.lang.AssertionError
        at org.apache.cassandra.utils.MerkleTree.inc(MerkleTree.java:154)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:262)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at org.apache.cassandra.utils.MerkleTree.difference(MerkleTree.java:244)
        at 
org.apache.cassandra.service.AntiEntropyService$Differencer.run(AntiEntropyService.java:458)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
ERROR [AntiEntropyStage:1] 2011-08-08 04:24:39,580 AbstractCassandraDaemon.java 
(line 113) Fatal exception in thread Thread[AntiEntropyStage:1,5,main]
java.lang.AssertionError
        at org.apache.cassandra.utils.MerkleTree.inc(MerkleTree.java:154)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:262)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:284)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at 
org.apache.cassandra.utils.MerkleTree.differenceHelper(MerkleTree.java:273)
        at org.apache.cassandra.utils.MerkleTree.difference(MerkleTree.java:244)
        at 
org.apache.cassandra.service.AntiEntropyService$Differencer.run(AntiEntropyService.java:458)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)

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