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#CASSANDRA13
Time-Series Metrics with Cassandra
Mike Heffner
#CASSANDRA13
What we do.
#CASSANDRA13
October 2011
l  Decision: All measurements in Cassandra
l  Single EC2 Ring: 6 * m1.large
l  Cassandra 0.8.x
l  How does this work?
#CASSANDRA13
Today
l  Multiple sharded rings
l  ~250,000 writes / second
l  EC2: m1.xlarge and m2.4xlarge
l  Cassandra 1.1.x
l  Read load: < 1%
#CASSANDRA13
Talk Highlights
l  Matching Schema to Storage
l  Optimally Expiring Data
l  Monitor Everything
#CASSANDRA13
Matching Schema to Storage
#CASSANDRA13
What is a Measurement?
( Metric ID, Source )
(X, Y) => (Time stamp, Value)
#CASSANDRA13
Measurement CF
Example: Select measurements between times [T1, T2]:
#CASSANDRA13
Locating Rows
Let us calculate the maximum row size:
l  1 minute records
l  1 week TTL
l  7 days * 24 hours * 60 minutes => 10,080
l  3 Longs * 8 bytes * 10k => ~240KB (not bad)
#CASSANDRA13
Row Storage Over Time
#CASSANDRA13
Row Storage Over Time
#CASSANDRA13
Seek All The SStables
#CASSANDRA13
Examining CF SSTables
Metrics/metric_id_epochs_60 histograms
Offset SSTables
1 28821
2 58859
3 201198
4 178326
5 223016
6 154952
7 83289
8 21552
10 81104
1 2 3 4 5 6 7 8 10
nodetool cfhistograms Metrics metric_id_epochs_60
#CASSANDRA13
Splitting the Rows
mget(Rows: [12, EBase_30], [12, EBase_40], Columns: {31->45})
Retrieve Time Bases for Times 31->45 for metric ID 12:
#CASSANDRA13
Examining CF SSTables
Metrics/metric_id_epochs_60
Offset SSTables
1 28821
2 58859
3 201198
4 178326
5 223016
6 154952
7 83289
8 21552
10 81104
1 2 3 4 5 6 7 8 10
nodetool cfhistograms Metrics metric_id_epochs_60
Metrics/metric_id_epochs_60
Offset SSTables
1 3491820
2 5389762
3 4095760
4 1310741
5 9976 1 2 3 4 5 6 7 8 9 10
Before
After
#CASSANDRA13
/graph me
#CASSANDRA13
Optimally Expiring Data
#CASSANDRA13
TTL Expiration
l  Churn of about 750GB / day
l  12 TB total
l  6% of data set
l  gc_grace = 0
l  STC
#CASSANDRA13
Synchronized Compactions
#CASSANDRA13
#CASSANDRA13
nodetool compact
#CASSANDRA13
* http://hight3ch.com/garbage-truck-crushing-a-car/
#CASSANDRA13
nodetool cleanup
#CASSANDRA13
Cleanup
l  Not just for topology changes
l  Tombstoned rows (not referenced)
l  Rotated row keys decrease references
l  Cons: Must process every sstable.
#CASSANDRA13
Immutable SStables
#CASSANDRA13
Leverage SStable Mod Time
l  If now – mtime > TTL => all data is expired
l  We can quickly eliminate entire sstables:
find -mtime +<TTL> -name *.db | xargs rm
l  Fast and low overhead
l  Cons: Rolling restart
26G 2013-05-17 09:44 Metrics-metrics_60-hf-7209-Data.db
#CASSANDRA13
nodetool setcompactionthreshold
#CASSANDRA13
Increasing minor compactions
l  By default, STC requires a minimum of 4 ssts
l  Leads to large non-compacted sstables
l  Dropping to 2 can flatten the storage growth
nodetool setcompactionthreshold <ks> <cf> 2
l  Cons: CPU/IO increase
#CASSANDRA13
Result
#CASSANDRA13
Effective Monitoring
#CASSANDRA13
Ring Dashboards
#CASSANDRA13
Disk Errors => Throw Away
l  If you ever see this, replace!
end_request: I/O error, dev xvdb, sector 467940617
end_request: I/O error, dev xvdb, sector 467940617
l  Mark node down, bootstrap new
l  No metric for this?
#CASSANDRA13
Cassandra Log Volume
l  Count log lines seen every 10 minutes
l  Track over time
l  Can identify:
-  Unbalanced workloads
-  Schema disagreements
-  Phantom gossip nodes
-  GC activity
l  grep -v '.java' => exceptions
#CASSANDRA13
Q & A
Mike Heffner
/mheffner
/mheffner

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C* Summit 2013: Time-Series Metrics with Cassandra by Mike Heffner