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https://issues.apache.org/jira/browse/CASSANDRA-5146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13550964#comment-13550964
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Michael Kjellman commented on CASSANDRA-5146:
---------------------------------------------

a working repair -pr seems to log "requesting merkle trees for messages xx"

we should have an alarm of some type (when things are working this never takes 
that long in reality) in here if we don't get to this code block log that the 
repair failed...
                
> repair -pr hangs
> ----------------
>
>                 Key: CASSANDRA-5146
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5146
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.2.0
>         Environment: Ubuntu 12.04
>            Reporter: Michael Kjellman
>            Priority: Critical
>
> while running a repair -pr the repair seems to hang after getting a merkle 
> tree
> {code}
>  INFO [AntiEntropySessions:9] 2013-01-10 18:23:01,652 AntiEntropyService.java 
> (line 652) [repair #d29fd100-5b95-11e2-b9c7-dd50a26832ff] new session: will 
> sync /10.8.25.101, /10.8.30.14 on range 
> (28356863910078205288614550619314017620,42535295865117307932921825928971026436]
>  for evidence.[fingerprints, messages]
>  INFO [AntiEntropySessions:9] 2013-01-10 18:23:01,653 AntiEntropyService.java 
> (line 857) [repair #d29fd100-5b95-11e2-b9c7-dd50a26832ff] requesting merkle 
> trees for fingerprints (to [/10.8.30.14, /10.8.25.101])
>  INFO [ValidationExecutor:7] 2013-01-10 18:23:01,654 ColumnFamilyStore.java 
> (line 647) Enqueuing flush of 
> Memtable-fingerprints@500862962(12960712/12960712 serialized/live bytes, 469 
> ops)
>  INFO [FlushWriter:25] 2013-01-10 18:23:01,655 Memtable.java (line 424) 
> Writing Memtable-fingerprints@500862962(12960712/12960712 serialized/live 
> bytes, 469 ops)
>  INFO [FlushWriter:25] 2013-01-10 18:23:02,058 Memtable.java (line 458) 
> Completed flushing 
> /data2/cassandra/evidence/fingerprints/evidence-fingerprints-ib-192-Data.db 
> (11413718 bytes) for commitlog position 
> ReplayPosition(segmentId=1357767160463, position=8921654)
>  INFO [AntiEntropyStage:1] 2013-01-10 18:25:52,735 AntiEntropyService.java 
> (line 214) [repair #d29fd100-5b95-11e2-b9c7-dd50a26832ff] Received merkle 
> tree for fingerprints from /10.8.25.101
> {code}

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