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CASSANDRA TK 2014	


LARGE NODES WITH
CASSANDRA	

Aaron Morton	

@aaronmorton	

!

Co-Founder & Principal Consultant	

www.thelastpickle.com
Licensed under a Creative Commons Attribution-NonCommercial 3.0 New Zealand License
About The Last Pickle.	


Work with clients to deliver and improve
Apache Cassandra based solutions.	

	

Apache Cassandra Committer, DataStax MVP,
Hector Maintainer, Apache Usergrid
Committer. 	

Based in New Zealand & USA.
Large Node?	

!

“Avoid storing more than 500GB per node”	

!

(Originally said about EC2 nodes.)
Large Node?	

!

“You may have issues if you have over 1
Billion keys per node.”
Before version 1.2 large nodes
had operational and
performance concerns.
After version 1.2 large nodes
have fewer operational and
performance concerns.
Issues Pre 1.2	

Work Arounds Pre 1.2	

Improvements 1.2 to 2.1	

!
Memory Management.	


Some in memory structures grow
with number of rows and size of
data.
Bloom Filter	


Stores bitset used to determine if a key exists
in an SSTable with a certain probability.	

!

Size depends on number of rows and
bloom_filter_fp_chance.
Bloom Filter	


Allocates pages of 4096 longs in a 	

long[][] array.
Bloom Filter Size	

0.01 bloom_filter_fp_chance

0.10 bloom_filter_fp_chance

Bloom Filer Size in MB

1,200

900

600

300

0

1

10

100
Millions of Rows

1,000
Compression Metadata	


Stores long offset into compressed Data.db file for each chunk_length_kb
(default 64) of uncompressed data.
!

Size depends on the uncompressed data size.
Compression Metadata	


Allocates pages of 4096 longs in a 	

long[][] array.
Compression Metadata Size
Snappy Compressor

Compress Metadata Size in MB

1,400

1,050

700

350

0

1

10

100
Uncompressed Size in GB

1,000

10,000
Index Samples	


Stores offset into -Index.db for every
index_interval (128) keys. 	

!

Size depends on the number of rows and the
size of the keys.	

!
Index Samples	


Allocates long[] for offsets and byte[]
[] for row keys.
!

(Version 1.2 using on heap structures)
Index Samples Total Size
Position Offset

Keys (25 bytes long)

Index Sample Total Size in MB

300

225

150

75

0

1

10

100
Millions of Rows

1,000
Memory Management.	


Larger Heaps (above 8GB) take
longer to GC.
!

Large working set results in
frequent prolonged GC.
Bootstrap.	


The joining node requests data from one
replica of each token range it will own.	

!

Sending is throttled by
stream_throughput_outbound_mega
bits_per_sec (default 200/25MB).
Bootstrap.	


With RF 3, only three nodes will send data to
a bootstrapping node.	

!

Maximum send rate is 75 MB/sec (3*25MB).
Moving Nodes.	


Copy data from existing node to new node.	

!

At 50 MB/s transferring 100GB takes 33
minutes.
Disk Management.	


Need a multi TB volume or use multiple
volumes.
Disk Management with RAID-0.	


Single disk failure results in total node failure.
Disk Management with RAID-10.	


Requires double the raw capacity.
Disk Management with Multiple Volumes.	


Specified via data_file_directories	

!

Write load not distributed.	

!

Single failure will shut down node.
Repair.	


Compare data between nodes and exchange
differences.	

!
Comparing Data for Repair.	


Calculate Merkle Tree hash by reading all
rows in a Table.	

(Validation Compaction)	

!

Single comparator, throttled by
compaction_throughput_mb_per_sec

(default 16).
Comparing Data for Repair.	


Time taken grows as the size of the data per
node grows.
Exchanging Data for Repair.	


Ranges of rows with differences are
Streamed.	

!

Sending is throttled by
stream_throughput_outbound_mega
bits_per_sec (default 200/25MB).
Compaction.	


Requires free space to write new SSTables.
SizeTieredCompactionStrategy.	


Groups SSTables by size, assumes no
reduction in size.	

!

In theory requires 50% free space, in practice
can work beyond 50% though not
recommended.
LeveledCompactionStrategy.	


Groups SSTables by “level” and groups row
fragments per level. 	

!

Requires approximately 25% free space.
Issues Pre 1.2	

Work Arounds Pre 1.2	

Improvements 1.2 to 2.1	

!
Memory Management Work Arounds.	


Reduce Bloom Filter size by increasing
bloom_filter_fp_chance from 0.01 to
0.1.	

!

May increase read latency.
Memory Management Work Arounds.	


Reduce Compression Metadata size by
increasing chunk_length_kb.	

!

May increase read latency.
Memory Management Work Arounds.	


Reduce Index Samples size by increasing
index_interval to 512.	

!

May increase read latency.
Memory Management Work Arounds.	


When necessary use a 12GB
MAX_HEAP_SIZE.	

!

Keep HEAP_NEWSIZE “reasonable” e.g.
less than 1200MB.
Bootstrap Work Arounds.	


Increase streaming throughput via
nodetool setstreamthroughput
whenever possible.
Moving Node Work Arounds.	


Copy nodetool snapshot while the
original node is operational.	

!

Copy only a delta when the original node is
stopped.
Disk Management Work Arounds.	


Use RAID-0 and over provision nodes
anticipating failure. 	

!

Use RAID-10 and accept additional costs.
Repair Work Arounds.	


Only use if data is deleted, rely on
Consistently Level for distribution. 	

!

Frequent small repair using token ranges.
Compaction Work Arounds.	


Over provision disk capacity when using
SizeTieredCompactionStrategy. 	

!

Reduce min_compaction_threshold (default
4) max_compaction_threshold (default 32) to
reduce number of SSTables per compaction.
Compaction Work Arounds.	


Use LeveledCompactionStrategy
where appropriate.
Issues Pre 1.2	

Work Arounds Pre 1.2	

Improvements 1.2 to 2.1
Memory Management Improvements.	


Version 1.2 moved Bloom Filters and
Compression Meta Data off the JVM Heap to
Native Memory.	

!

Version 2.0 moved Index Samples off the JVM
Heap.
Bootstrap Improvements.	


Virtual Nodes increases the number of Token
Ranges per node from 1 to 256.	

!

Bootstrapping node can request data from
256 different nodes.
Disk Layout Improvements.	


“JBOD” support distributes concurrent
writes to multiple
data_file_directories.
Disk Layout Improvements.	


disk_failure_policy adds support for
handling disk failure.	

!

ignore
stop
best_effort
Repair Improvements.	


“Avoid repairing already-repaired data by
default” CASSANDRA-5351	

!

Scheduled for 2.1
Compaction Improvements.	


“Avoid allocating overly large bloom filters”
CASSANDRA-5906	

!

Included in 2.1
Thanks.

	


!
Aaron Morton	

@aaronmorton	

www.thelastpickle.com	


Licensed under a Creative Commons Attribution-NonCommercial 3.0 New Zealand License

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