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From "Victor Trac (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-10057) RepairMessageVerbHandler.java:95 - Cannot start multiple repair sessions over the same sstables
Date Wed, 12 Aug 2015 17:27:45 GMT
Victor Trac created CASSANDRA-10057:
---------------------------------------

             Summary: RepairMessageVerbHandler.java:95 - Cannot start multiple repair sessions
over the same sstables
                 Key: CASSANDRA-10057
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10057
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: Amazon Linux: 3.14.48-33.39.amzn1.x86_64
java version "1.7.0_85"
OpenJDK Runtime Environment (amzn-2.6.1.3.61.amzn1-x86_64 u85-b01)
OpenJDK 64-Bit Server VM (build 24.85-b03, mixed mode)
Cassandra RPM: cassandra22-2.2.0-1.noarch
            Reporter: Victor Trac
             Fix For: 2.2.x


I bootstrapped a DC2 by restoring the snapshots from DC1 into equivalent nodes in DC2. Everything
comes up just fine, but when I tried to run a {code}repair -dcpar -j4{code} in DC2, I got
this error:
{code}
[root@cassandra-i-2677cce3 ~]# nodetool repair -dcpar -j4
[2015-08-12 15:56:05,682] Nothing to repair for keyspace 'system_auth'
[2015-08-12 15:56:05,949] Starting repair command #4, repairing keyspace crawl with repair
options (parallelism: dc_parallel, primary range: false, incremental: true, job threads: 4,
ColumnFamilies: [], dataCenters: [], hosts: [], # of ranges: 2275)
[2015-08-12 15:59:33,050] Repair session 1b8d7810-410b-11e5-b71c-71288cf05b1d for range (-1630840392403060839,-1622173360499444177]
finished (progress: 0%)
[2015-08-12 15:59:33,284] Repair session 1b92a830-410b-11e5-b71c-71288cf05b1d for range (-2766833977081486018,-2766120936176524808]
failed with error Could not create snapshot at /10.20.144.15 (progress: 0%)
[2015-08-12 15:59:35,543] Repair session 1b8fe910-410b-11e5-b71c-71288cf05b1d for range (5127720400742928658,5138864412691114632]
finished (progress: 0%)
[2015-08-12 15:59:36,040] Repair session 1b960390-410b-11e5-b71c-71288cf05b1d for range (749871306972906628,751065038788146229]
failed with error Could not create snapshot at /10.20.144.15 (progress: 0%)
[2015-08-12 15:59:36,454] Repair session 1b9455e0-410b-11e5-b71c-71288cf05b1d for range (-8769666365699147423,-8767955202550789015]
finished (progress: 0%)
[2015-08-12 15:59:38,765] Repair session 1b97b140-410b-11e5-b71c-71288cf05b1d for range (-4434580467371714601,-4433394767535421669]
finished (progress: 0%)
[2015-08-12 15:59:41,520] Repair session 1b99d420-410b-11e5-b71c-71288cf05b1d for range (-1085112943862424751,-1083156277882030877]
finished (progress: 0%)
[2015-08-12 15:59:43,806] Repair session 1b9da4b0-410b-11e5-b71c-71288cf05b1d for range (2125359121242932804,2126816999370470831]
failed with error Could not create snapshot at /10.20.144.15 (progress: 0%)
[2015-08-12 15:59:43,874] Repair session 1b9ba8e0-410b-11e5-b71c-71288cf05b1d for range (-7469857353178912795,-7459624955099554284]
finished (progress: 0%)
[2015-08-12 15:59:48,384] Repair session 1b9fa080-410b-11e5-b71c-71288cf05b1d for range (-8005238987831093686,-8005057803798566519]
finished (progress: 0%)
[2015-08-12 15:59:48,392] Repair session 1ba17540-410b-11e5-b71c-71288cf05b1d for range (7291056720707652994,7292508243124389877]
failed with error Could not create snapshot at /10.20.144.15 (progress: 0%)
{code}

It seems like now that all 4 threads ran into an error, the repair process just sits forever.

Looking at 10.20.144.15, I see this:
{code}
ERROR [AntiEntropyStage:2] 2015-08-12 15:59:35,965 RepairMessageVerbHandler.java:95 - Cannot
start multiple repair sessions over the same sstables
ERROR [AntiEntropyStage:2] 2015-08-12 15:59:35,966 RepairMessageVerbHandler.java:153 - Got
error, removing parent repair session
ERROR [AntiEntropyStage:2] 2015-08-12 15:59:35,966 CassandraDaemon.java:182 - Exception in
thread Thread[AntiEntropyStage:2,5,main]
java.lang.RuntimeException: java.lang.RuntimeException: Cannot start multiple repair sessions
over the same sstables
        at org.apache.cassandra.repair.RepairMessageVerbHandler.doVerb(RepairMessageVerbHandler.java:156)
~[apache-cassandra-2.2.0.jar:2.2.0]
        at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:64) ~[apache-cassandra-2.2.0.jar:2.2.0]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
~[na:1.7.0_85]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
~[na:1.7.0_85]
        at java.lang.Thread.run(Thread.java:745) ~[na:1.7.0_85]
Caused by: java.lang.RuntimeException: Cannot start multiple repair sessions over the same
sstables
        at org.apache.cassandra.repair.RepairMessageVerbHandler.doVerb(RepairMessageVerbHandler.java:96)
~[apache-cassandra-2.2.0.jar:2.2.0]
        ... 4 common frames omitted
ERROR [AntiEntropyStage:3] 2015-08-12 15:59:38,722 RepairMessageVerbHandler.java:153 - Got
error, removing parent repair session
ERROR [AntiEntropyStage:3] 2015-08-12 15:59:38,723 CassandraDaemon.java:182 - Exception in
thread Thread[AntiEntropyStage:3,5,main]
java.lang.RuntimeException: java.lang.NullPointerException
        at org.apache.cassandra.repair.RepairMessageVerbHandler.doVerb(RepairMessageVerbHandler.java:156)
~[apache-cassandra-2.2.0.jar:2.2.0]
        at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:64) ~[apache-cassandra-2.2.0.jar:2.2.0]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
~[na:1.7.0_85]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
~[na:1.7.0_85]
        at java.lang.Thread.run(Thread.java:745) ~[na:1.7.0_85]
Caused by: java.lang.NullPointerException: null
        at org.apache.cassandra.repair.RepairMessageVerbHandler.doVerb(RepairMessageVerbHandler.java:98)
~[apache-cassandra-2.2.0.jar:2.2.0]
        ... 4 common frames omitted
...
{code}

I thought maybe the -j4 was causing the issue, but when I run it without the -j param, I get
the same error but on a different node.

It seems like there are two problems:
# {code}RepairMessageVerbHandler.java:95 - Cannot start multiple repair sessions over the
same sstables{code}
# The repair process on the initiating node just sits there forever after the threads ran
into an error. It seems to me that it should exit out and report back an error to the user.



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