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From "Raul Barroso (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13511) Compaction stats high with no CPU use.
Date Tue, 09 May 2017 11:42:04 GMT
Raul Barroso created CASSANDRA-13511:
----------------------------------------

             Summary: Compaction stats high with no CPU use. 
                 Key: CASSANDRA-13511
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13511
             Project: Cassandra
          Issue Type: Bug
          Components: Compaction
         Environment: Red Hat Maipo 7.3

$ nodetool -h localhost version
ReleaseVersion: 2.2.8

$ nodetool describecluster
Cluster Information:
	Name: XXXXXXX Production Cassandra Cluster
	Snitch: org.apache.cassandra.locator.DynamicEndpointSnitch
	Partitioner: org.apache.cassandra.dht.Murmur3Partitioner
	Schema versions:
		6938e859-955d-3ecb-aa0a-07bac9db1fc1: [172.16.121.4, 172.16.121.68, 172.16.121.5, 172.16.121.69,
172.16.121.6, 172.16.121.70, 172.16.121.7, 172.16.121.71]

$ nodetool status
Datacenter: DC1
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens       Owns (effective)  Host ID                     
         Rack
UN  172.16.121.4   1.59 TB    1            75.0%             cbf7608f-fd8e-49c6-83d7-2ac5a5a9104c
 RAC1
UN  172.16.121.5   1.44 TB    1            75.0%             fa10aa81-c336-4f8b-a6fe-09f7f92e2026
 RAC1
UN  172.16.121.6   1.52 TB    1            75.0%             d0ed7e9f-034f-490a-8112-30d0b0829c81
 RAC1
UN  172.16.121.7   2.01 TB    1            75.0%             e17ce089-d638-410e-816f-498567200c3d
 RAC1
Datacenter: DC2
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens       Owns (effective)  Host ID                     
         Rack
UN  172.16.121.68  2.3 TB     1            75.0%             eb92ecdc-4be1-452f-b638-67cb8c9c32fd
 RAC1
UN  172.16.121.69  2.77 TB    1            75.0%             cbd93cfc-48a4-4eb5-8015-d1d1f513d09c
 RAC1
UN  172.16.121.70  2.82 TB    1            75.0%             f6d415cf-40c0-4da5-8996-5551dadf2640
 RAC1
UN  172.16.121.71  1.65 TB    1            75.0%             160a7251-fe54-4d4d-8251-32abc6408753
 RAC1




            Reporter: Raul Barroso
            Priority: Trivial
             Fix For: 2.2.x


Hi Team,

First of all, this is my first post on apache's JIRA and I'm not pretty sure if I'm doing
it right. Excuse any inconvenience and let me know if there's some mistake from my side.

We currently are facing some problems at our company with the delivered productive environment.
Right now I'm keen on compaction tasks.

We are having high compaction tasks on two nodes from our cluster. Currently 84/92 tasks on
these nodes with low CPU usage and no activity on disk (1-2 Mb/s Read and write values on
iostats).

I'm quite confused with the info shown at compactionstats & tpstats (see below): 

-	83 pending compaction tasks + 10 running
-	CompactionExecutor : 8 Active    151 Pending

Why doesn't these numbers match? 
Why are the compactions being accumulated if the system CPU and I/O are low?
Why are we running a "unreleased" version and what does that mean?

Thanks for your time and help here. Greatly appreciated.  Rbarroso.

 
$ nodetool compactionstats
pending tasks: 83
                                     id               compaction type         keyspace   
                               table      completed           total    unit   progress
   a3307690-3480-11e7-a556-b1cf2e788d44                    Compaction   revenue_events   
                        usage_events    29628223698     42281336944   bytes     70.07%
   d67dde80-3321-11e7-a556-b1cf2e788d44                    Validation   revenue_events   
        usage_events_by_agreement_id   884497156069   1000368079324   bytes     88.42%
   925b4540-34a6-11e7-a556-b1cf2e788d44   Anticompaction after repair               cm   
                  resources__history     2907492207      5106868634   bytes     56.93%
   760fa550-3395-11e7-a556-b1cf2e788d44                    Compaction   revenue_events   charging_balance_changes_by_source_id
  195729008027    240875858343   bytes     81.26%
   622374c0-3423-11e7-a556-b1cf2e788d44                    Compaction   revenue_events   
                       event_charges    93038948816    128189837056   bytes     72.58%
   0b188320-3485-11e7-a556-b1cf2e788d44                    Compaction   revenue_events   
     recharge_events_by_agreement_id    27485751628     40857511701   bytes     67.27%
   e714bf40-3464-11e7-a556-b1cf2e788d44                    Compaction   revenue_events   charging_balance_changes_by_target_id
   51642077893    104669802576   bytes     49.34%
   ef12b890-34a1-11e7-a556-b1cf2e788d44   Anticompaction after repair               cm   
                         individuals     6276572787      6987894450   bytes     89.82%
   f6073d80-34a4-11e7-a556-b1cf2e788d44   Anticompaction after repair               cm   
                 agreements__history     4081490766     10168203433   bytes     40.14%
   cc251310-3496-11e7-a556-b1cf2e788d44                    Validation   revenue_events   
        usage_events_by_agreement_id   169361885289    907665793695   bytes     18.66%
Active compaction remaining time :   2h38m18s


$ nodetool tpstats
Pool Name                    Active   Pending      Completed   Blocked  All time blocked
MutationStage                     0         0     2751211799         0                 0
ReadStage                         0         0          31316         0                 0
RequestResponseStage              0         0           8071         0                 0
ReadRepairStage                   0         0              1         0                 0
CounterMutationStage              0         0              0         0                 0
Repair#26                         1       139            137         0                 0
HintedHandoff                     0         0            566         0                 0
MiscStage                         0         0              0         0                 0
CompactionExecutor                8       151        1617296         0                 0
MemtableReclaimMemory             0         0          49919         0                 0
PendingRangeCalculator            0         0             19         0                 0
GossipStage                       0         0        4248064         0                 0
MigrationStage                    0         0          68432         0                 0
MemtablePostFlush                 0         0          74595         0                 0
ValidationExecutor                2         2            848         0                 0
Sampler                           0         0              0         0                 0
MemtableFlushWriter               0         0          49705         0                 0
InternalResponseStage             0         0            288         0                 0
AntiEntropyStage                  0         0           4181         0                 0
CacheCleanupExecutor              0         0              0         0                 0
Native-Transport-Requests         0         0         283879         0                 0

Message type           Dropped
READ                         0
RANGE_SLICE                  0
_TRACE                       0
MUTATION                     5
COUNTER_MUTATION             0
REQUEST_RESPONSE             0
PAGED_RANGE                  0
READ_REPAIR                  0






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