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From Dan Kinder <dkin...@turnitin.com>
Subject Re:
Date Thu, 28 Sep 2017 21:12:19 GMT
Sorry, for that ReadStage exception, I take it back, accidentally ended up
too early in the logs. This node that has building ReadStage shows no
exceptions in the logs.

nodetool tpstats
Pool Name                         Active   Pending      Completed   Blocked
 All time blocked
ReadStage                              8      1882          45881         0
                0
MiscStage                              0         0              0         0
                0
CompactionExecutor                     9         9           2551         0
                0
MutationStage                          0         0       35929880         0
                0
GossipStage                            0         0          35793         0
                0
RequestResponseStage                   0         0         751285         0
                0
ReadRepairStage                        0         0            224         0
                0
CounterMutationStage                   0         0              0         0
                0
MemtableFlushWriter                    0         0            111         0
                0
MemtablePostFlush                      0         0            239         0
                0
ValidationExecutor                     0         0              0         0
                0
ViewMutationStage                      0         0              0         0
                0
CacheCleanupExecutor                   0         0              0         0
                0
PerDiskMemtableFlushWriter_10          0         0            104         0
                0
PerDiskMemtableFlushWriter_11          0         0            104         0
                0
MemtableReclaimMemory                  0         0            116         0
                0
PendingRangeCalculator                 0         0             16         0
                0
SecondaryIndexManagement               0         0              0         0
                0
HintsDispatcher                        0         0             13         0
                0
PerDiskMemtableFlushWriter_1           0         0            104         0
                0
Native-Transport-Requests              0         0        2607030         0
                0
PerDiskMemtableFlushWriter_2           0         0            104         0
                0
MigrationStage                         0         0            278         0
                0
PerDiskMemtableFlushWriter_0           0         0            115         0
                0
Sampler                                0         0              0         0
                0
PerDiskMemtableFlushWriter_5           0         0            104         0
                0
InternalResponseStage                  0         0            298         0
                0
PerDiskMemtableFlushWriter_6           0         0            104         0
                0
PerDiskMemtableFlushWriter_3           0         0            104         0
                0
PerDiskMemtableFlushWriter_4           0         0            104         0
                0
PerDiskMemtableFlushWriter_9           0         0            104         0
                0
AntiEntropyStage                       0         0              0         0
                0
PerDiskMemtableFlushWriter_7           0         0            104         0
                0
PerDiskMemtableFlushWriter_8           0         0            104         0
                0

Message type           Dropped
READ                         0
RANGE_SLICE                  0
_TRACE                       0
HINT                         0
MUTATION                     0
COUNTER_MUTATION             0
BATCH_STORE                  0
BATCH_REMOVE                 0
REQUEST_RESPONSE             0
PAGED_RANGE                  0
READ_REPAIR                  0


On Thu, Sep 28, 2017 at 2:08 PM, Dan Kinder <dkinder@turnitin.com> wrote:

> Thanks for the responses.
>
> @Prem yes this is after the entire cluster is on 3.11, but no I did not
> run upgradesstables yet.
>
> @Thomas no I don't see any major GC going on.
>
> @Jeff yeah it's fully upgraded. I decided to shut the whole thing down and
> bring it back (thankfully this cluster is not serving live traffic). The
> nodes seemed okay for an hour or two, but I see the issue again, without me
> bouncing any nodes. This time it's ReadStage that's building up, and the
> exception I'm seeing in the logs is:
>
> DEBUG [ReadRepairStage:106] 2017-09-28 13:01:37,206 ReadCallback.java:242
> - Digest mismatch:
>
> org.apache.cassandra.service.DigestMismatchException: Mismatch for key
> DecoratedKey(6150926370328526396, 696a6374652e6f7267) (
> 2f0fffe2d743cdc4c69c3eb351a3c9ca vs 00ee661ae190c2cbf0eb2fb8a51f6025)
>
>         at org.apache.cassandra.service.DigestResolver.compareResponses(DigestResolver.java:92)
> ~[apache-cassandra-3.11.0.jar:3.11.0]
>
>         at org.apache.cassandra.service.ReadCallback$
> AsyncRepairRunner.run(ReadCallback.java:233)
> ~[apache-cassandra-3.11.0.jar:3.11.0]
>
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [na:1.8.0_71]
>
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [na:1.8.0_71]
>
>         at org.apache.cassandra.concurrent.NamedThreadFactory.
> lambda$threadLocalDeallocator$0(NamedThreadFactory.java:81)
> [apache-cassandra-3.11.0.jar:3.11.0]
>
>         at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_71]
>
>
> Do you think running upgradesstables would help? Or relocatesstables? I
> presumed it shouldn't be necessary for Cassandra to function, just an
> optimization.
>
> On Thu, Sep 28, 2017 at 12:49 PM, Steinmaurer, Thomas <
> thomas.steinmaurer@dynatrace.com> wrote:
>
>> Dan,
>>
>>
>>
>> do you see any major GC? We have been hit by the following memory leak in
>> our loadtest environment with 3.11.0.
>>
>> https://issues.apache.org/jira/browse/CASSANDRA-13754
>>
>>
>>
>> So, depending on the heap size and uptime, you might get into heap
>> troubles.
>>
>>
>>
>> Thomas
>>
>>
>>
>> *From:* Dan Kinder [mailto:dkinder@turnitin.com]
>> *Sent:* Donnerstag, 28. September 2017 18:20
>> *To:* user@cassandra.apache.org
>> *Subject:*
>>
>>
>>
>> Hi,
>>
>> I recently upgraded our 16-node cluster from 2.2.6 to 3.11 and see the
>> following. The cluster does function, for a while, but then some stages
>> begin to back up and the node does not recover and does not drain the
>> tasks, even under no load. This happens both to MutationStage and
>> GossipStage.
>>
>> I do see the following exception happen in the logs:
>>
>>
>>
>> ERROR [ReadRepairStage:2328] 2017-09-26 23:07:55,440
>> CassandraDaemon.java:228 - Exception in thread
>> Thread[ReadRepairStage:2328,5,main]
>>
>> org.apache.cassandra.exceptions.ReadTimeoutException: Operation timed
>> out - received only 1 responses.
>>
>>         at org.apache.cassandra.service.DataResolver$RepairMergeListener.close(DataResolver.java:171)
>> ~[apache-cassandra-3.11.0.jar:3.11.0]
>>
>>         at org.apache.cassandra.db.partitions.UnfilteredPartitionIterat
>> ors$2.close(UnfilteredPartitionIterators.java:182)
>> ~[apache-cassandra-3.11.0.jar:3.11.0]
>>
>>         at org.apache.cassandra.db.transform.BaseIterator.close(BaseIterator.java:82)
>> ~[apache-cassandra-3.11.0.jar:3.11.0]
>>
>>         at org.apache.cassandra.service.DataResolver.compareResponses(DataResolver.java:89)
>> ~[apache-cassandra-3.11.0.jar:3.11.0]
>>
>>         at org.apache.cassandra.service.AsyncRepairCallback$1.runMayThr
>> ow(AsyncRepairCallback.java:50) ~[apache-cassandra-3.11.0.jar:3.11.0]
>>
>>         at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
>> ~[apache-cassandra-3.11.0.jar:3.11.0]
>>
>>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>> ~[na:1.8.0_91]
>>
>>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>> ~[na:1.8.0_91]
>>
>>         at org.apache.cassandra.concurrent.NamedThreadFactory.lambda$
>> threadLocalDeallocator$0(NamedThreadFactory.java:81)
>> ~[apache-cassandra-3.11.0.jar:3.11.0]
>>
>>         at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_91]
>>
>>
>>
>> But it's hard to correlate precisely with things going bad. It is also
>> very strange to me since I have both read_repair_chance and
>> dclocal_read_repair_chance set to 0.0 for ALL of my tables. So it is
>> confusing why ReadRepairStage would err.
>>
>> Anyone have thoughts on this? It's pretty muddling, and causes nodes to
>> lock up. Once it happens Cassandra can't even shut down, I have to kill -9.
>> If I can't find a resolution I'm going to need to downgrade and restore to
>> backup...
>>
>> The only issue I found that looked similar is https://issues.apache.org/j
>> ira/browse/CASSANDRA-12689 but that appears to be fixed by 3.10.
>>
>>
>>
>> $ nodetool tpstats
>>
>> Pool Name                         Active   Pending      Completed
>> Blocked  All time blocked
>>
>> ReadStage                              0         0         582103
>>   0                 0
>>
>> MiscStage                              0         0              0
>>   0                 0
>>
>> CompactionExecutor                    11        11           2868
>>   0                 0
>>
>> MutationStage                         32   4593678       55057393
>>   0                 0
>>
>> GossipStage                            1      2818         371487
>>   0                 0
>>
>> RequestResponseStage                   0         0        4345522
>>   0                 0
>>
>> ReadRepairStage                        0         0         151473
>>   0                 0
>>
>> CounterMutationStage                   0         0              0
>>   0                 0
>>
>> MemtableFlushWriter                    1        81             76
>>   0                 0
>>
>> MemtablePostFlush                      1       382            139
>>   0                 0
>>
>> ValidationExecutor                     0         0              0
>>   0                 0
>>
>> ViewMutationStage                      0         0              0
>>   0                 0
>>
>> CacheCleanupExecutor                   0         0              0
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_10          0         0             69
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_11          0         0             69
>>   0                 0
>>
>> MemtableReclaimMemory                  0         0             81
>>   0                 0
>>
>> PendingRangeCalculator                 0         0             32
>>   0                 0
>>
>> SecondaryIndexManagement               0         0              0
>>   0                 0
>>
>> HintsDispatcher                        0         0            596
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_1           0         0             69
>>   0                 0
>>
>> Native-Transport-Requests             11         0        4547746
>>   0                67
>>
>> PerDiskMemtableFlushWriter_2           0         0             69
>>   0                 0
>>
>> MigrationStage                         1      1545            586
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_0           0         0             80
>>   0                 0
>>
>> Sampler                                0         0              0
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_5           0         0             69
>>   0                 0
>>
>> InternalResponseStage                  0         0          45432
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_6           0         0             69
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_3           0         0             69
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_4           0         0             69
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_9           0         0             69
>>   0                 0
>>
>> AntiEntropyStage                       0         0              0
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_7           0         0             69
>>   0                 0
>>
>> PerDiskMemtableFlushWriter_8           0         0             69
>>   0                 0
>>
>>
>>
>> Message type           Dropped
>>
>> READ                         0
>>
>> RANGE_SLICE                  0
>>
>> _TRACE                       0
>>
>> HINT                         0
>>
>> MUTATION                     0
>>
>> COUNTER_MUTATION             0
>>
>> BATCH_STORE                  0
>>
>> BATCH_REMOVE                 0
>>
>> REQUEST_RESPONSE             0
>>
>> PAGED_RANGE                  0
>>
>> READ_REPAIR                  0
>>
>>
>>
>> -dan
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>>
>
>
>
> --
> Dan Kinder
> Principal Software Engineer
> Turnitin – www.turnitin.com
> dkinder@turnitin.com
>



-- 
Dan Kinder
Principal Software Engineer
Turnitin – www.turnitin.com
dkinder@turnitin.com

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