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241 lines
8.9 KiB
Plaintext
241 lines
8.9 KiB
Plaintext
###########################################################################
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# jvm.options #
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# #
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# - all flags defined here will be used by cassandra to startup the JVM #
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# - one flag should be specified per line #
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# - lines that do not start with '-' will be ignored #
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# - only static flags are accepted (no variables or parameters) #
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# - dynamic flags will be appended to these on cassandra-env #
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###########################################################################
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######################
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# STARTUP PARAMETERS #
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######################
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# Uncomment any of the following properties to enable specific startup parameters
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# In a multi-instance deployment, multiple Cassandra instances will independently assume that all
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# CPU processors are available to it. This setting allows you to specify a smaller set of processors
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# and perhaps have affinity.
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#-Dcassandra.available_processors=number_of_processors
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# The directory location of the cassandra.yaml file.
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#-Dcassandra.config=directory
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# Sets the initial partitioner token for a node the first time the node is started.
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#-Dcassandra.initial_token=token
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# Set to false to start Cassandra on a node but not have the node join the cluster.
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#-Dcassandra.join_ring=true|false
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# Set to false to clear all gossip state for the node on restart. Use when you have changed node
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# information in cassandra.yaml (such as listen_address).
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#-Dcassandra.load_ring_state=true|false
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# Enable pluggable metrics reporter. See Pluggable metrics reporting in Cassandra 2.0.2.
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#-Dcassandra.metricsReporterConfigFile=file
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# Set the port on which the CQL native transport listens for clients. (Default: 9042)
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#-Dcassandra.native_transport_port=port
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# Overrides the partitioner. (Default: org.apache.cassandra.dht.Murmur3Partitioner)
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#-Dcassandra.partitioner=partitioner
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# To replace a node that has died, restart a new node in its place specifying the address of the
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# dead node. The new node must not have any data in its data directory, that is, it must be in the
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# same state as before bootstrapping.
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#-Dcassandra.replace_address=listen_address or broadcast_address of dead node
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# Allow restoring specific tables from an archived commit log.
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#-Dcassandra.replayList=table
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# Allows overriding of the default RING_DELAY (1000ms), which is the amount of time a node waits
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# before joining the ring.
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#-Dcassandra.ring_delay_ms=ms
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# Set the port for the Thrift RPC service, which is used for client connections. (Default: 9160)
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#-Dcassandra.rpc_port=port
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# Set the SSL port for encrypted communication. (Default: 7001)
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#-Dcassandra.ssl_storage_port=port
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# Enable or disable the native transport server. See start_native_transport in cassandra.yaml.
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# cassandra.start_native_transport=true|false
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# Enable or disable the Thrift RPC server. (Default: true)
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#-Dcassandra.start_rpc=true/false
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# Set the port for inter-node communication. (Default: 7000)
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#-Dcassandra.storage_port=port
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# Set the default location for the trigger JARs. (Default: conf/triggers)
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#-Dcassandra.triggers_dir=directory
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# For testing new compaction and compression strategies. It allows you to experiment with different
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# strategies and benchmark write performance differences without affecting the production workload.
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#-Dcassandra.write_survey=true
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# To disable configuration via JMX of auth caches (such as those for credentials, permissions and
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# roles). This will mean those config options can only be set (persistently) in cassandra.yaml
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# and will require a restart for new values to take effect.
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#-Dcassandra.disable_auth_caches_remote_configuration=true
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########################
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# GENERAL JVM SETTINGS #
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########################
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# enable assertions. disabling this in production will give a modest
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# performance benefit (around 5%).
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-ea
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# enable thread priorities, primarily so we can give periodic tasks
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# a lower priority to avoid interfering with client workload
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-XX:+UseThreadPriorities
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# allows lowering thread priority without being root on linux - probably
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# not necessary on Windows but doesn't harm anything.
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# see http://tech.stolsvik.com/2010/01/linux-java-thread-priorities-workar
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-XX:ThreadPriorityPolicy=42
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# Enable heap-dump if there's an OOM
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-XX:+HeapDumpOnOutOfMemoryError
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# Per-thread stack size.
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-Xss256k
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# Larger interned string table, for gossip's benefit (CASSANDRA-6410)
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-XX:StringTableSize=1000003
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# Make sure all memory is faulted and zeroed on startup.
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# This helps prevent soft faults in containers and makes
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# transparent hugepage allocation more effective.
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-XX:+AlwaysPreTouch
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# Disable biased locking as it does not benefit Cassandra.
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-XX:-UseBiasedLocking
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# Enable thread-local allocation blocks and allow the JVM to automatically
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# resize them at runtime.
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-XX:+UseTLAB
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-XX:+ResizeTLAB
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# http://www.evanjones.ca/jvm-mmap-pause.html
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-XX:+PerfDisableSharedMem
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# Prefer binding to IPv4 network intefaces (when net.ipv6.bindv6only=1). See
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# http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6342561 (short version:
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# comment out this entry to enable IPv6 support).
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-Djava.net.preferIPv4Stack=true
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### Debug options
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# uncomment to enable flight recorder
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#-XX:+UnlockCommercialFeatures
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#-XX:+FlightRecorder
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# uncomment to have Cassandra JVM listen for remote debuggers/profilers on port 1414
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#-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=1414
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# uncomment to have Cassandra JVM log internal method compilation (developers only)
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#-XX:+UnlockDiagnosticVMOptions
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#-XX:+LogCompilation
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#################
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# HEAP SETTINGS #
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#################
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# Heap size is automatically calculated by cassandra-env based on this
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# formula: max(min(1/2 ram, 1024MB), min(1/4 ram, 8GB))
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# That is:
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# - calculate 1/2 ram and cap to 1024MB
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# - calculate 1/4 ram and cap to 8192MB
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# - pick the max
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#
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# For production use you may wish to adjust this for your environment.
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# If that's the case, uncomment the -Xmx and Xms options below to override the
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# automatic calculation of JVM heap memory.
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#
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# It is recommended to set min (-Xms) and max (-Xmx) heap sizes to
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# the same value to avoid stop-the-world GC pauses during resize, and
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# so that we can lock the heap in memory on startup to prevent any
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# of it from being swapped out.
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#-Xms4G
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#-Xmx4G
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# Young generation size is automatically calculated by cassandra-env
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# based on this formula: min(100 * num_cores, 1/4 * heap size)
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#
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# The main trade-off for the young generation is that the larger it
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# is, the longer GC pause times will be. The shorter it is, the more
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# expensive GC will be (usually).
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#
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# It is not recommended to set the young generation size if using the
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# G1 GC, since that will override the target pause-time goal.
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# More info: http://www.oracle.com/technetwork/articles/java/g1gc-1984535.html
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#
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# The example below assumes a modern 8-core+ machine for decent
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# times. If in doubt, and if you do not particularly want to tweak, go
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# 100 MB per physical CPU core.
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#-Xmn800M
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#################
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# GC SETTINGS #
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#################
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### CMS Settings
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#-XX:+UseParNewGC
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#-XX:+UseConcMarkSweepGC
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#-XX:+CMSParallelRemarkEnabled
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#-XX:SurvivorRatio=8
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#-XX:MaxTenuringThreshold=1
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#-XX:CMSInitiatingOccupancyFraction=75
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#-XX:+UseCMSInitiatingOccupancyOnly
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#-XX:CMSWaitDuration=10000
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#-XX:+CMSParallelInitialMarkEnabled
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#-XX:+CMSEdenChunksRecordAlways
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# some JVMs will fill up their heap when accessed via JMX, see CASSANDRA-6541
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#-XX:+CMSClassUnloadingEnabled
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### G1 Settings (experimental, comment previous section and uncomment section below to enable)
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## Use the Hotspot garbage-first collector.
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-XX:+UseG1GC
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#
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## Have the JVM do less remembered set work during STW, instead
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## preferring concurrent GC. Reduces p99.9 latency.
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-XX:G1RSetUpdatingPauseTimePercent=5
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#
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## Main G1GC tunable: lowering the pause target will lower throughput and vise versa.
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## 200ms is the JVM default and lowest viable setting
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## 1000ms increases throughput. Keep it smaller than the timeouts in cassandra.yaml.
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#-XX:MaxGCPauseMillis=500
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## Optional G1 Settings
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# Save CPU time on large (>= 16GB) heaps by delaying region scanning
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# until the heap is 70% full. The default in Hotspot 8u40 is 40%.
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#-XX:InitiatingHeapOccupancyPercent=70
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# For systems with > 8 cores, the default ParallelGCThreads is 5/8 the number of logical cores.
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# Otherwise equal to the number of cores when 8 or less.
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# Machines with > 10 cores should try setting these to <= full cores.
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#-XX:ParallelGCThreads=16
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# By default, ConcGCThreads is 1/4 of ParallelGCThreads.
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# Setting both to the same value can reduce STW durations.
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#-XX:ConcGCThreads=16
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### GC logging options -- uncomment to enable
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-XX:+PrintGCDetails
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-XX:+PrintGCDateStamps
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-XX:+PrintHeapAtGC
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-XX:+PrintTenuringDistribution
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-XX:+PrintGCApplicationStoppedTime
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-XX:+PrintPromotionFailure
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#-XX:PrintFLSStatistics=1
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#-Xloggc:/var/log/cassandra/gc.log
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-XX:+UseGCLogFileRotation
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-XX:NumberOfGCLogFiles=10
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-XX:GCLogFileSize=10M
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