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https://issues.apache.org/jira/browse/CASSANDRA-8643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17812558#comment-17812558
 ] 

Kapil Shewate commented on CASSANDRA-8643:
------------------------------------------

https://issues.apache.org/jira/browse/CASSANDRA-19209 looks related to this 
defect. 

> merkle tree creation fails with NoSuchElementException
> ------------------------------------------------------
>
>                 Key: CASSANDRA-8643
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8643
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: We are running on a three node cluster with three in 
> replication(C* 2.1.1). It uses a default C* installation and STCS.
>            Reporter: Jan Karlsson
>            Priority: Normal
>              Labels: remove-reopen
>             Fix For: 2.1.x
>
>
>   We have a problem that we encountered during testing over the weekend. 
>  During the tests we noticed that repairs started to fail. This error has 
> occured on multiple non-coordinator nodes during repair. It also ran at least 
> once without producing this error.
> We run repair -pr on all nodes on different days. CPU values were around 40% 
> and disk was 50% full.
> From what I understand, the coordinator asked for merkle trees from the other 
> two nodes. However one of the nodes fails to create his merkle tree.
> Unfortunately we do not have a way to reproduce this problem.
> The coordinator receives:
> {noformat}
> 2015-01-09T17:55:57.091+0100  INFO [RepairJobTask:4] RepairJob.java:145 
> [repair #59455950-9820-11e4-b5c1-7797064e1316] requesting merkle trees for 
> censored (to [/xx.90, /xx.98, /xx.82])
> 2015-01-09T17:55:58.516+0100  INFO [AntiEntropyStage:1] 
> RepairSession.java:171 [repair #59455950-9820-11e4-b5c1-7797064e1316] 
> Received merkle tree for censored from /xx.90
> 2015-01-09T17:55:59.581+0100 ERROR [AntiEntropySessions:76] 
> RepairSession.java:303 [repair #59455950-9820-11e4-b5c1-7797064e1316] session 
> completed with the following error
> org.apache.cassandra.exceptions.RepairException: [repair 
> #59455950-9820-11e4-b5c1-7797064e1316 on censored/censored, 
> (-6476420463551243930,-6471459119674373580]] Validation failed in /xx.98
>         at 
> org.apache.cassandra.repair.RepairSession.validationComplete(RepairSession.java:166)
>  ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> org.apache.cassandra.service.ActiveRepairService.handleMessage(ActiveRepairService.java:384)
>  ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> org.apache.cassandra.repair.RepairMessageVerbHandler.doVerb(RepairMessageVerbHandler.java:126)
>  ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62) 
> ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>  [na:1.7.0_51]
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>  [na:1.7.0_51]
>         at java.lang.Thread.run(Thread.java:744) [na:1.7.0_51]
> 2015-01-09T17:55:59.582+0100 ERROR [AntiEntropySessions:76] 
> CassandraDaemon.java:153 Exception in thread 
> Thread[AntiEntropySessions:76,5,RMI Runtime]
> java.lang.RuntimeException: org.apache.cassandra.exceptions.RepairException: 
> [repair #59455950-9820-11e4-b5c1-7797064e1316 on censored/censored, 
> (-6476420463551243930,-6471459119674373580]] Validation failed in /xx.98
>         at com.google.common.base.Throwables.propagate(Throwables.java:160) 
> ~[guava-16.0.jar:na]
>         at 
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:32) 
> ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) 
> ~[na:1.7.0_51]
>         at java.util.concurrent.FutureTask.run(FutureTask.java:262) 
> ~[na:1.7.0_51]
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>  ~[na:1.7.0_51]
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>  [na:1.7.0_51]
>        at java.lang.Thread.run(Thread.java:744) [na:1.7.0_51] Caused by: 
> org.apache.cassandra.exceptions.RepairException: [repair 
> #59455950-9820-11e4-b5c1-7797064e1316 on censored/censored, 
> (-6476420463551243930,-6471459119674373580]] Validation failed in /xx.98
>         at 
> org.apache.cassandra.repair.RepairSession.validationComplete(RepairSession.java:166)
>  ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> org.apache.cassandra.service.ActiveRepairService.handleMessage(ActiveRepairService.java:384)
>  ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> org.apache.cassandra.repair.RepairMessageVerbHandler.doVerb(RepairMessageVerbHandler.java:126)
>  ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62) 
> ~[apache-cassandra-2.1.1.jar:2.1.1]
>         ... 3 common frames omitted
> {noformat}
> While one of the other nodes produces this error:
> {noformat}
> 2015-01-09T17:55:59.574+0100 ERROR [ValidationExecutor:16] Validator.java:232 
> Failed creating a merkle tree for [repair 
> #59455950-9820-11e4-b5c1-7797064e1316 on censored/censored, 
> (-6476420463551243930,-6471459119674373580]], /xx.82 (see log for details)
> 2015-01-09T17:55:59.578+0100 ERROR [ValidationExecutor:16] 
> CassandraDaemon.java:153 Exception in thread 
> Thread[ValidationExecutor:16,1,main]
> java.util.NoSuchElementException: null
>         at 
> com.google.common.collect.AbstractIterator.next(AbstractIterator.java:154) 
> ~[guava-16.0.jar:na]
>         at org.apache.cassandra.repair.Validator.add(Validator.java:137) 
> ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> org.apache.cassandra.db.compaction.CompactionManager.doValidationCompaction(CompactionManager.java:930)
>  ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> org.apache.cassandra.db.compaction.CompactionManager.access$600(CompactionManager.java:97)
>  ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at 
> org.apache.cassandra.db.compaction.CompactionManager$9.call(CompactionManager.java:557)
>  ~[apache-cassandra-2.1.1.jar:2.1.1]
>         at java.util.concurrent.FutureTask.run(FutureTask.java:262) 
> ~[na:1.7.0_51]
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>  ~[na:1.7.0_51]
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>  [na:1.7.0_51]
>         at java.lang.Thread.run(Thread.java:744) [na:1.7.0_51]
> {noformat}



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