I have a cassandra setup with 7 Node Ring single DC with RF:7 and Read:CL:1.There is live traffic on these nodes except one -> the traffic is 90% read. There are also writes happening to all these nodes which typically are user specific data etc.At times what is happening is there are 2-3 say nodes getting in a hanged state and eventually the whole ring behaves so. There state in terms of CPU Usage is very High 17Loads ,network incoming and outgoing requests packet were very high and there is continuous GC(Major and Minor) pauses happening and Read Messages dropped simultaneously.Also the SSTables couunt have increased and decreased for some families during this time. So majorly its the GC and SStable compaction and Memtable flush happening. We are running cassandra behind solr using Solandra.The max docs that we have are around 0.5Million.
Read repair chance is 1.0 as well. Would reducing the RF to 3 or 4 and also read_repair_chance help.Also I want to look into optimizing memtable related parameters for fine tuning compaction etc.Would that help as well.
We keep one node as the main write node where we run sheduled job thats pools data into the cluster from MySql db.These jobs are run hourly.Recently we have increased the data to somewhere to the size of 30X . Before the same setup was stable and these jobs used to run in every 5 minutes apart from the similar problem 2-3 times.
GC:Settings
4Gb Heap Xmx,Xms
2Gb Young Geneartion: Xmn
ParNew
CMS
-XX:+UseParNewGC"
-XX:+UseConcMarkSweepGC"
-XX:+CMSParallelRemarkEnabled"
-XX:SurvivorRatio=8"
-XX:MaxTenuringThreshold=1"
-XX:CMSInitiatingOccupancyFraction=75"
-XX:+UseCMSInitiatingOccupancyOnly"
Memtable Threshold is also:0.75 and rest default cassandra settings
Also we dont have in place a connectionpool for thrift.We are using cassandra:0.8.6 with solr:3.3
Will share the Cfstats shortly or anything else needed for that matter.Can you guys help me kn this.
==========================================
Keyspace: system
Read Count: 19
Read Latency: 5.6876842105263155 ms.
Write Count: 2375
Write Latency: 0.010477894736842104 ms.
Pending Tasks: 0
Column Family: NodeIdInfo
SSTable count: 0
Space used (live): 0
Space used (total): 0
Number of Keys (estimate): 0
Memtable Columns Count: 0
Memtable Data Size: 0
Memtable Switch Count: 0
Read Count: 0
Read Latency: NaN ms.
Write Count: 0
Write Latency: NaN ms.
Pending Tasks: 0
Key cache capacity: 1
Key cache size: 0
Key cache hit rate: NaN
Row cache: disabled
Compacted row minimum size: 0
Compacted row maximum size: 0
Compacted row mean size: 0
Column Family: HintsColumnFamily
SSTable count: 2
Space used (live): 492064
Space used (total): 492064
Number of Keys (estimate): 256
Memtable Columns Count: 0
Memtable Data Size: 0
Memtable Switch Count: 3
Read Count: 10
Read Latency: 5.643 ms.
Write Count: 2372
Write Latency: 0.010 ms.
Pending Tasks: 0
Key cache capacity: 2
Key cache size: 2
Key cache hit rate: 0.42857142857142855
Row cache: disabled
Compacted row minimum size: 219343
Compacted row maximum size: 263210
Compacted row mean size: 263210
Column Family: Schema
SSTable count: 2
Space used (live): 20827
Space used (total): 20827
Number of Keys (estimate): 256
Memtable Columns Count: 0
Memtable Data Size: 0
Memtable Switch Count: 0
Read Count: 3
Read Latency: 4.253 ms.
Write Count: 0
Write Latency: NaN ms.
Pending Tasks: 0
Key cache capacity: 2
Key cache size: 2
Key cache hit rate: 0.0
Row cache: disabled
Compacted row minimum size: 104
Compacted row maximum size: 8239
Compacted row mean size: 3314
Column Family: Migrations
SSTable count: 2
Space used (live): 33180
Space used (total): 33180
Number of Keys (estimate): 256
Memtable Columns Count: 0
Memtable Data Size: 0
Memtable Switch Count: 0
Read Count: 0
Read Latency: NaN ms.
Write Count: 0
Write Latency: NaN ms.
Pending Tasks: 0
Key cache capacity: 2
Key cache size: 0
Key cache hit rate: NaN
Row cache: disabled
Compacted row minimum size: 9888
Compacted row maximum size: 17084
Compacted row mean size: 14474
Column Family: IndexInfo
SSTable count: 0
Space used (live): 0
Space used (total): 0
Number of Keys (estimate): 0
Memtable Columns Count: 0
Memtable Data Size: 0
Memtable Switch Count: 0
Read Count: 0
Read Latency: NaN ms.
Write Count: 0
Write Latency: NaN ms.
Pending Tasks: 0
Key cache capacity: 1
Key cache size: 0
Key cache hit rate: NaN
Row cache: disabled
Compacted row minimum size: 0
Compacted row maximum size: 0
Compacted row mean size: 0
Column Family: LocationInfo
SSTable count: 3
Space used (live): 15844
Space used (total): 15844
Number of Keys (estimate): 384
Memtable Columns Count: 0
Memtable Data Size: 0
Memtable Switch Count: 2
Read Count: 6
Read Latency: 6.479 ms.
Write Count: 3
Write Latency: 0.004 ms.
Pending Tasks: 0
Key cache capacity: 3
Key cache size: 3
Key cache hit rate: 0.3333333333333333
Row cache: disabled
Compacted row minimum size: 73
Compacted row maximum size: 310
Compacted row mean size: 126
----------------
Keyspace: L
Read Count: 535675
Read Latency: 4.472875136976712 ms.
Write Count: 282216
Write Latency: 0.08156946806701251 ms.
Pending Tasks: 0
Column Family: FC
SSTable count: 6
Space used (live): 444790202
Space used (total): 444790202
Number of Keys (estimate): 768
Memtable Columns Count: 93231
Memtable Data Size: 172790560
Memtable Switch Count: 1
Read Count: 6651
Read Latency: 62.041 ms.
Write Count: 94235
Write Latency: 0.026 ms.
Pending Tasks: 0
Key cache: disabled
Row cache: disabled
Compacted row minimum size: 104
Compacted row maximum size: 10090808
Compacted row mean size: 4256880
Column Family: Docs
SSTable count: 7
Space used (live): 1487268134
Space used (total): 1487268134
Number of Keys (estimate): 303744
Memtable Columns Count: 98040
Memtable Data Size: 37732086
Memtable Switch Count: 1
Read Count: 125986
Read Latency: 1.868 ms.
Write Count: 11900
Write Latency: 0.520 ms.
Pending Tasks: 0
Key cache: disabled
Row cache: disabled
Compacted row minimum size: 36
Compacted row maximum size: 51012
Compacted row mean size: 5547
Column Family: SI
SSTable count: 3
Space used (live): 136512555
Space used (total): 136512555
Number of Keys (estimate): 286848
Memtable Columns Count: 5344
Memtable Data Size: 21139811
Memtable Switch Count: 1
Read Count: 27642
Read Latency: 0.880 ms.
Write Count: 5815
Write Latency: 0.093 ms.
Pending Tasks: 0
Key cache: disabled
Row cache: disabled
Compacted row minimum size: 73
Compacted row maximum size: 30130992
Compacted row mean size: 5022190
Column Family: TL
SSTable count: 4
Space used (live): 314821524
Space used (total): 314821524
Number of Keys (estimate): 512
Memtable Columns Count: 83428
Memtable Data Size: 16069959
Memtable Switch Count: 1
Read Count: 10867
Read Latency: 17.949 ms.
Write Count: 5386
Write Latency: 0.578 ms.
Pending Tasks: 0
Key cache: disabled
Row cache: disabled
Compacted row minimum size: 12108971
Compacted row maximum size: 186563160
Compacted row mean size: 90195666
Column Family: TI
SSTable count: 6
Space used (live): 1451685937
Space used (total): 1451685937
Number of Keys (estimate): 3910144
Memtable Columns Count: 166006
Memtable Data Size: 184308808
Memtable Switch Count: 1
Read Count: 364529
Read Latency: 4.194 ms.
Write Count: 164880
Write Latency: 0.065 ms.
Pending Tasks: 0
Key cache: disabled
Row cache: disabled
Compacted row minimum size: 104
Compacted row maximum size: 7007506
Compacted row mean size: 18922
----------------
Keyspace: LH
Read Count: 61353
Read Latency: 0.20730264208759147 ms.
Write Count: 56289
Write Latency: 0.13461228659240704 ms.
Pending Tasks: 0
Column Family: UserPrefrences
SSTable count: 4
Space used (live): 335309522
Space used (total): 335309522
Number of Keys (estimate): 1513600
Memtable Columns Count: 12807
Memtable Data Size: 9144714
Memtable Switch Count: 1
Read Count: 20132
Read Latency: 0.201 ms.
Write Count: 27817
Write Latency: 0.009 ms.
Pending Tasks: 0
Key cache: disabled
Row cache: disabled
Compacted row minimum size: 61
Compacted row maximum size: 215
Compacted row mean size: 179
Column Family: LastViewedHotels
SSTable count: 3
Space used (live): 152316912
Space used (total): 152316912
Number of Keys (estimate): 767104
Memtable Columns Count: 3059
Memtable Data Size: 2906758
Memtable Switch Count: 1
Read Count: 9077
Read Latency: 0.180 ms.
Write Count: 3585
Write Latency: 0.018 ms.
Pending Tasks: 0
Key cache: disabled
Row cache capacity: 10000
Row cache size: 565
Row cache hit rate: 0.7896882229811611
Compacted row minimum size: 36
Compacted row maximum size: 51012
Compacted row mean size: 144
Column Family: BookedHotels
SSTable count: 3
Space used (live): 7274700
Space used (total): 7274700
Number of Keys (estimate): 39680
Memtable Columns Count: 7
Memtable Data Size: 392
Memtable Switch Count: 1
Read Count: 139
Read Latency: 0.027 ms.
Write Count: 10
Write Latency: 0.008 ms.
Pending Tasks: 0
Key cache: disabled
Row cache capacity: 10000
Row cache size: 4
Row cache hit rate: 0.2302158273381295
Compacted row minimum size: 87
Compacted row maximum size: 35425
Compacted row mean size: 139
Column Family: HotelMessage
SSTable count: 1
Space used (live): 349735
Space used (total): 349735
Number of Keys (estimate): 512
Memtable Columns Count: 19424
Memtable Data Size: 3408866
Memtable Switch Count: 1
Read Count: 4726
Read Latency: 0.059 ms.
Write Count: 9431
Write Latency: 0.739 ms.
Pending Tasks: 0
Key cache: disabled
Row cache capacity: 10000
Row cache size: 144
Row cache hit rate: 0.968049090139653
Compacted row minimum size: 87
Compacted row maximum size: 24601
Compacted row mean size: 867
Column Family: SavedHotels
SSTable count: 1
Space used (live): 650153
Space used (total): 650153
Number of Keys (estimate): 3456
Memtable Columns Count: 13
Memtable Data Size: 728
Memtable Switch Count: 1
Read Count: 4282
Read Latency: 0.029 ms.
Write Count: 15
Write Latency: 0.014 ms.
Pending Tasks: 0
Key cache: disabled
Row cache capacity: 10000
Row cache size: 13
Row cache hit rate: 0.06819243344231668
Compacted row minimum size: 104
Compacted row maximum size: 2299
Compacted row mean size: 160
Column Family: SavedHotelsInverted
SSTable count: 1
Space used (live): 646988
Space used (total): 646988
Number of Keys (estimate): 3456
Memtable Columns Count: 13
Memtable Data Size: 728
Memtable Switch Count: 1
Read Count: 13
Read Latency: 3.014 ms.
Write Count: 15
Write Latency: 0.007 ms.
Pending Tasks: 0
Key cache: disabled
Row cache capacity: 10000
Row cache size: 2
Row cache hit rate: 0.15384615384615385
Compacted row minimum size: 104
Compacted row maximum size: 2299
Compacted row mean size: 160
Column Family: LastViewedHotelsInverted
SSTable count: 4
Space used (live): 147678370
Space used (total): 147678370
Number of Keys (estimate): 770048
Memtable Columns Count: 2486
Memtable Data Size: 2524930
Memtable Switch Count: 1
Read Count: 2667
Read Latency: 0.622 ms.
Write Count: 3590
Write Latency: 0.010 ms.
Pending Tasks: 0
Key cache: disabled
Row cache capacity: 10000
Row cache size: 477
Row cache hit rate: 0.3820772403449569
Compacted row minimum size: 36
Compacted row maximum size: 51012
Compacted row mean size: 160
Column Family: SavedSearchRequest
SSTable count: 11
Space used (live): 4560932807
Space used (total): 4560932807
Number of Keys (estimate): 1022336
Memtable Columns Count: 7762
Memtable Data Size: 17281321
Memtable Switch Count: 1
Read Count: 20317
Read Latency: 0.242 ms.
Write Count: 11827
Write Latency: 0.022 ms.
Pending Tasks: 0
Key cache: disabled
Row cache capacity: 10000
Row cache size: 619
Row cache hit rate: 0.7583304621745336
Compacted row minimum size: 925
Compacted row maximum size: 1955666
Compacted row mean size: 5014
Column Family: HotelTariffs
SSTable count: 3
Space used (live): 42775204
Space used (total): 42775204
Number of Keys (estimate): 18176
Memtable Columns Count: 0
Memtable Data Size: 0
Memtable Switch Count: 0
Read Count: 0
Read Latency: NaN ms.
Write Count: 0
Write Latency: NaN ms.
Pending Tasks: 0
Key cache: disabled
Row cache capacity: 10000
Row cache size: 0
Row cache hit rate: NaN
Compacted row minimum size: 180
Compacted row maximum size: 9887
Compacted row mean size: 2179
Cassandra.yaml
# Cassandra storage config YAML
# NOTE:
# See http://wiki.apache.org/cassandra/StorageConfiguration for
# full explanations of configuration directives
# /NOTE
# The name of the cluster. This is mainly used to prevent machines in
# one logical cluster from joining another.
cluster_name: 'Solandra Cluster'
# You should always specify InitialToken when setting up a production
# cluster for the first time, and often when adding capacity later.
# The principle is that each node should be given an equal slice of
# the token ring; see http://wiki.apache.org/cassandra/Operations
# for more details.
#
# If blank, Cassandra will request a token bisecting the range of
# the heaviest-loaded existing node. If there is no load information
# available, such as is the case with a new cluster, it will pick
# a random token, which will lead to hot spots.
initial_token:
# See http://wiki.apache.org/cassandra/HintedHandoff
hinted_handoff_enabled: true
# this defines the maximum amount of time a dead host will have hints
# generated. After it has been dead this long, hints will be dropped.
max_hint_window_in_ms: 3600000 # one hour
# Sleep this long after delivering each row or row fragment
hinted_handoff_throttle_delay_in_ms: 50
# authentication backend, implementing IAuthenticator; used to identify users
authenticator: org.apache.cassandra.auth.AllowAllAuthenticator
# authorization backend, implementing IAuthority; used to limit access/provide permissions
authority: org.apache.cassandra.auth.AllowAllAuthority
# The partitioner is responsible for distributing rows (by key) across
# nodes in the cluster. Any IPartitioner may be used, including your
# own as long as it is on the classpath. Out of the box, Cassandra
# provides org.apache.cassandra.dht.RandomPartitioner
# org.apache.cassandra.dht.ByteOrderedPartitioner,
# org.apache.cassandra.dht.OrderPreservingPartitioner (deprecated),
# and org.apache.cassandra.dht.CollatingOrderPreservingPartitioner
# (deprecated).
#
# - RandomPartitioner distributes rows across the cluster evenly by md5.
# When in doubt, this is the best option.
# - ByteOrderedPartitioner orders rows lexically by key bytes. BOP allows
# scanning rows in key order, but the ordering can generate hot spots
# for sequential insertion workloads.
# - OrderPreservingPartitioner is an obsolete form of BOP, that stores
# - keys in a less-efficient format and only works with keys that are
# UTF8-encoded Strings.
# - CollatingOPP colates according to EN,US rules rather than lexical byte
# ordering. Use this as an example if you need custom collation.
#
# See http://wiki.apache.org/cassandra/Operations for more on
# partitioners and token selection.
partitioner: lucandra.dht.RandomPartitioner
# directories where Cassandra should store data on disk.
data_file_directories:
- /opt/cassandra-data/data
# commit log
commitlog_directory: /opt/cassandra-data/commitlog
# saved caches
saved_caches_directory: /opt/cassandra-data/saved_caches
# commitlog_sync may be either "periodic" or "batch."
# When in batch mode, Cassandra won't ack writes until the commit log
# has been fsynced to disk. It will wait up to
# commitlog_sync_batch_window_in_ms milliseconds for other writes, before
# performing the sync.
#
# commitlog_sync: batch
# commitlog_sync_batch_window_in_ms: 50
#
# the other option is "periodic" where writes may be acked immediately
# and the CommitLog is simply synced every commitlog_sync_period_in_ms
# milliseconds.
commitlog_sync: periodic
commitlog_sync_period_in_ms: 10000
# any class that implements the SeedProvider interface and has a
# constructor that takes a Map<String, String> of parameters will do.
seed_provider:
# Addresses of hosts that are deemed contact points.
# Cassandra nodes use this list of hosts to find each other and learn
# the topology of the ring. You must change this if you are running
# multiple nodes!
- class_name: org.apache.cassandra.locator.SimpleSeedProvider
parameters:
# seeds is actually a comma-delimited list of addresses.
# Ex: "<ip1>,<ip2>,<ip3>"
- seeds: "127.0.0.1"
# emergency pressure valve: each time heap usage after a full (CMS)
# garbage collection is above this fraction of the max, Cassandra will
# flush the largest memtables.
#
# Set to 1.0 to disable. Setting this lower than
# CMSInitiatingOccupancyFraction is not likely to be useful.
#
# RELYING ON THIS AS YOUR PRIMARY TUNING MECHANISM WILL WORK POORLY:
# it is most effective under light to moderate load, or read-heavy
# workloads; under truly massive write load, it will often be too
# little, too late.
flush_largest_memtables_at: 0.75
# emergency pressure valve #2: the first time heap usage after a full
# (CMS) garbage collection is above this fraction of the max,
# Cassandra will reduce cache maximum _capacity_ to the given fraction
# of the current _size_. Should usually be set substantially above
# flush_largest_memtables_at, since that will have less long-term
# impact on the system.
#
# Set to 1.0 to disable. Setting this lower than
# CMSInitiatingOccupancyFraction is not likely to be useful.
reduce_cache_sizes_at: 0.85
reduce_cache_capacity_to: 0.6
# For workloads with more data than can fit in memory, Cassandra's
# bottleneck will be reads that need to fetch data from
# disk. "concurrent_reads" should be set to (16 * number_of_drives) in
# order to allow the operations to enqueue low enough in the stack
# that the OS and drives can reorder them.
#
# On the other hand, since writes are almost never IO bound, the ideal
# number of "concurrent_writes" is dependent on the number of cores in
# your system; (8 * number_of_cores) is a good rule of thumb.
concurrent_reads: 32
concurrent_writes: 32
# Total memory to use for memtables. Cassandra will flush the largest
# memtable when this much memory is used.
# If omitted, Cassandra will set it to 1/3 of the heap.
# memtable_total_space_in_mb: 2048
# Total space to use for commitlogs.
# If space gets above this value (it will round up to the next nearest
# segment multiple), Cassandra will flush every dirty CF in the oldest
# segment and remove it.
# commitlog_total_space_in_mb: 4096
# This sets the amount of memtable flush writer threads. These will
# be blocked by disk io, and each one will hold a memtable in memory
# while blocked. If you have a large heap and many data directories,
# you can increase this value for better flush performance.
# By default this will be set to the amount of data directories defined.
#memtable_flush_writers: 1
# the number of full memtables to allow pending flush, that is,
# waiting for a writer thread. At a minimum, this should be set to
# the maximum number of secondary indexes created on a single CF.
memtable_flush_queue_size: 4
# Buffer size to use when performing contiguous column slices.
# Increase this to the size of the column slices you typically perform
sliced_buffer_size_in_kb: 64
# TCP port, for commands and data
storage_port: 7000
# SSL port, for encrypted communication. Unused unless enabled in
# encryption_options
ssl_storage_port: 7001
# Address to bind to and tell other Cassandra nodes to connect to. You
# _must_ change this if you want multiple nodes to be able to
# communicate!
#
# Leaving it blank leaves it up to InetAddress.getLocalHost(). This
# will always do the Right Thing *if* the node is properly configured
# (hostname, name resolution, etc), and the Right Thing is to use the
# address associated with the hostname (it might not be).
#
# Setting this to 0.0.0.0 is always wrong.
listen_address: localhost
# Address to broadcast to other Cassandra nodes
# Leaving this blank will set it to the same value as listen_address
# broadcast_address: 1.2.3.4
# The address to bind the Thrift RPC service to -- clients connect
# here. Unlike ListenAddress above, you *can* specify 0.0.0.0 here if
# you want Thrift to listen on all interfaces.
#
# Leaving this blank has the same effect it does for ListenAddress,
# (i.e. it will be based on the configured hostname of the node).
rpc_address: localhost
# port for Thrift to listen for clients on
rpc_port: 9160
# enable or disable keepalive on rpc connections
rpc_keepalive: true
# Cassandra provides three options for the RPC Server:
#
# sync -> One connection per thread in the rpc pool (see below).
# For a very large number of clients, memory will be your limiting
# factor; on a 64 bit JVM, 128KB is the minimum stack size per thread.
# Connection pooling is very, very strongly recommended.
#
# async -> Nonblocking server implementation with one thread to serve
# rpc connections. This is not recommended for high throughput use
# cases. Async has been tested to be about 50% slower than sync
# or hsha and is deprecated: it will be removed in the next major release.
#
# hsha -> Stands for "half synchronous, half asynchronous." The rpc thread pool
# (see below) is used to manage requests, but the threads are multiplexed
# across the different clients.
#
# The default is sync because on Windows hsha is about 30% slower. On Linux,
# sync/hsha performance is about the same, with hsha of course using less memory.
rpc_server_type: sync
# Uncomment rpc_min|max|thread to set request pool size.
# You would primarily set max for the sync server to safeguard against
# misbehaved clients; if you do hit the max, Cassandra will block until one
# disconnects before accepting more. The defaults for sync are min of 16 and max
# unlimited.
#
# For the Hsha server, the min and max both default to quadruple the number of
# CPU cores.
#
# This configuration is ignored by the async server.
#
# rpc_min_threads: 16
# rpc_max_threads: 2048
# uncomment to set socket buffer sizes on rpc connections
# rpc_send_buff_size_in_bytes:
# rpc_recv_buff_size_in_bytes:
# Frame size for thrift (maximum field length).
# 0 disables TFramedTransport in favor of TSocket. This option
# is deprecated; we strongly recommend using Framed mode.
thrift_framed_transport_size_in_mb: 15
# The max length of a thrift message, including all fields and
# internal thrift overhead.
thrift_max_message_length_in_mb: 16
# Set to true to have Cassandra create a hard link to each sstable
# flushed or streamed locally in a backups/ subdirectory of the
# Keyspace data. Removing these links is the operator's
# responsibility.
incremental_backups: false
# Whether or not to take a snapshot before each compaction. Be
# careful using this option, since Cassandra won't clean up the
# snapshots for you. Mostly useful if you're paranoid when there
# is a data format change.
snapshot_before_compaction: false
# Add column indexes to a row after its contents reach this size.
# Increase if your column values are large, or if you have a very large
# number of columns. The competing causes are, Cassandra has to
# deserialize this much of the row to read a single column, so you want
# it to be small - at least if you do many partial-row reads - but all
# the index data is read for each access, so you don't want to generate
# that wastefully either.
column_index_size_in_kb: 64
# Size limit for rows being compacted in memory. Larger rows will spill
# over to disk and use a slower two-pass compaction process. A message
# will be logged specifying the row key.
in_memory_compaction_limit_in_mb: 64
# Number of simultaneous compactions to allow, NOT including
# validation "compactions" for anti-entropy repair. Simultaneous
# compactions can help preserve read performance in a mixed read/write
# workload, by mitigating the tendency of small sstables to accumulate
# during a single long running compactions. The default is usually
# fine and if you experience problems with compaction running too
# slowly or too fast, you should look at
# compaction_throughput_mb_per_sec first.
#
# This setting has no effect on LeveledCompactionStrategy.
#
# concurrent_compactors defaults to the number of cores.
# Uncomment to make compaction mono-threaded, the pre-0.8 default.
#concurrent_compactors: 1
# Multi-threaded compaction. When enabled, each compaction will use
# up to one thread per core, plus one thread per sstable being merged.
# This is usually only useful for SSD-based hardware: otherwise,
# your concern is usually to get compaction to do LESS i/o (see:
# compaction_throughput_mb_per_sec), not more.
multithreaded_compaction: false
# Throttles compaction to the given total throughput across the entire
# system. The faster you insert data, the faster you need to compact in
# order to keep the sstable count down, but in general, setting this to
# 16 to 32 times the rate you are inserting data is more than sufficient.
# Setting this to 0 disables throttling. Note that this account for all types
# of compaction, including validation compaction.
compaction_throughput_mb_per_sec: 16
# Track cached row keys during compaction, and re-cache their new
# positions in the compacted sstable. Disable if you use really large
# key caches.
compaction_preheat_key_cache: true
# Throttles all outbound streaming file transfers on this node to the
# given total throughput in Mbps. This is necessary because Cassandra does
# mostly sequential IO when streaming data during bootstrap or repair, which
# can lead to saturating the network connection and degrading rpc performance.
# When unset, the default is 400 Mbps or 50 MB/s.
# stream_throughput_outbound_megabits_per_sec: 400
# Time to wait for a reply from other nodes before failing the command
rpc_timeout_in_ms: 10000
# phi value that must be reached for a host to be marked down.
# most users should never need to adjust this.
# phi_convict_threshold: 8
# endpoint_snitch -- Set this to a class that implements
# IEndpointSnitch, which will let Cassandra know enough
# about your network topology to route requests efficiently.
# Out of the box, Cassandra provides
# - org.apache.cassandra.locator.SimpleSnitch:
# Treats Strategy order as proximity. This improves cache locality
# when disabling read repair, which can further improve throughput.
# - org.apache.cassandra.locator.RackInferringSnitch:
# Proximity is determined by rack and data center, which are
# assumed to correspond to the 3rd and 2nd octet of each node's
# IP address, respectively
# org.apache.cassandra.locator.PropertyFileSnitch:
# - Proximity is determined by rack and data center, which are
# explicitly configured in cassandra-topology.properties.
endpoint_snitch: org.apache.cassandra.locator.PropertyFileSnitch
# controls how often to perform the more expensive part of host score
# calculation
dynamic_snitch_update_interval_in_ms: 100
# controls how often to reset all host scores, allowing a bad host to
# possibly recover
dynamic_snitch_reset_interval_in_ms: 600000
# if set greater than zero and read_repair_chance is < 1.0, this will allow
# 'pinning' of replicas to hosts in order to increase cache capacity.
# The badness threshold will control how much worse the pinned host has to be
# before the dynamic snitch will prefer other replicas over it. This is
# expressed as a double which represents a percentage. Thus, a value of
# 0.2 means Cassandra would continue to prefer the static snitch values
# until the pinned host was 20% worse than the fastest.
dynamic_snitch_badness_threshold: 0.1
# request_scheduler -- Set this to a class that implements
# RequestScheduler, which will schedule incoming client requests
# according to the specific policy. This is useful for multi-tenancy
# with a single Cassandra cluster.
# NOTE: This is specifically for requests from the client and does
# not affect inter node communication.
# org.apache.cassandra.scheduler.NoScheduler - No scheduling takes place
# org.apache.cassandra.scheduler.RoundRobinScheduler - Round robin of
# client requests to a node with a separate queue for each
# request_scheduler_id. The scheduler is further customized by
# request_scheduler_options as described below.
request_scheduler: org.apache.cassandra.scheduler.NoScheduler
# Scheduler Options vary based on the type of scheduler
# NoScheduler - Has no options
# RoundRobin
# - throttle_limit -- The throttle_limit is the number of in-flight
# requests per client. Requests beyond
# that limit are queued up until
# running requests can complete.
# The value of 80 here is twice the number of
# concurrent_reads + concurrent_writes.
# - default_weight -- default_weight is optional and allows for
# overriding the default which is 1.
# - weights -- Weights are optional and will default to 1 or the
# overridden default_weight. The weight translates into how
# many requests are handled during each turn of the
# RoundRobin, based on the scheduler id.
#
# request_scheduler_options:
# throttle_limit: 80
# default_weight: 5
# weights:
# Keyspace1: 1
# Keyspace2: 5
# request_scheduler_id -- An identifer based on which to perform
# the request scheduling. Currently the only valid option is keyspace.
# request_scheduler_id: keyspace
# index_interval controls the sampling of entries from the primrary
# row index in terms of space versus time. The larger the interval,
# the smaller and less effective the sampling will be. In technicial
# terms, the interval coresponds to the number of index entries that
# are skipped between taking each sample. All the sampled entries
# must fit in memory. Generally, a value between 128 and 512 here
# coupled with a large key cache size on CFs results in the best trade
# offs. This value is not often changed, however if you have many
# very small rows (many to an OS page), then increasing this will
# often lower memory usage without a impact on performance.
index_interval: 128
# Enable or disable inter-node encryption
# Default settings are TLS v1, RSA 1024-bit keys (it is imperative that
# users generate their own keys) TLS_RSA_WITH_AES_128_CBC_SHA as the cipher
# suite for authentication, key exchange and encryption of the actual data transfers.
# NOTE: No custom encryption options are enabled at the moment
# The available internode options are : all, none, dc, rack
#
# If set to dc cassandra will encrypt the traffic between the DCs
# If set to rack cassandra will encrypt the traffic between the racks
#
# The passwords used in these options must match the passwords used when generating
# the keystore and truststore. For instructions on generating these files, see:
# http://download.oracle.com/javase/6/docs/technotes/guides/security/jsse/JSSERefGuide.html#CreateKeystore
encryption_options:
internode_encryption: none
keystore: conf/.keystore
keystore_password: cassandra
truststore: conf/.truststore
truststore_password: cassandra