The name of your application. This will appear in the UI and in log data.
spark.master
(none)
The cluster manager to connect to. See the list ofallowed master URL’s.
spark.executor.memory
512m
Amount of memory to use per executor process, in the same format as JVM memory strings (e.g.512m,2g).
spark.serializer
org.apache.spark.serializer.
JavaSerializer
Class to use for serializing objects that will be sent over the network or need to be cached in serialized form. The default of Java serialization works with any Serializable Java object but is quite slow, so we recommendusingorg.apache.spark.serializer.KryoSerializer and configuring Kryo serialization when speed is necessary. Can be any subclass oforg.apache.spark.Serializer.
spark.kryo.registrator
(none)
If you use Kryo serialization, set this class to register your custom classes with Kryo. It should be set to a class that extendsKryoRegistrator. See thetuning guide for more details.
spark.local.dir
/tmp
Directory to use for “scratch” space in Spark, including map output files and RDDs that get stored on disk. This should be on a fast, local disk in your system. It can also be a comma-separated list of multiple directories on different disks. NOTE: In Spark 1.0 and later this will be overriden by SPARK_LOCAL_DIRS (Standalone, Mesos) or LOCAL_DIRS (YARN) environment variables set by the cluster manager.
spark.logConf
false
Logs the effective SparkConf as INFO when a SparkContext is started.
除了这些，下面的属性也可用，在某些情况下需要设置:
运行时环境Runtime Environment
属性名
缺省值
意义
spark.executor.extraJavaOptions
(none)
A string of extra JVM options to pass to executors. For instance, GC settings or other logging. Note that it is illegal to set Spark properties or heap size settings with this option. Spark properties should be set using a SparkConf object or the spark-defaults.conf file used with the spark-submit script. Heap size settings can be set with spark.executor.memory.
spark.executor.extraClassPath
(none)
Extra classpath entries to append to the classpath of executors. This exists primarily for backwards-compatibility with older versions of Spark. Users typically should not need to set this option.
spark.executor.extraLibraryPath
(none)
Set a special library path to use when launching executor JVM’s.
spark.files.userClassPathFirst
false
(Experimental) Whether to give user-added jars precedence over Spark’s own jars when loading classes in Executors. This feature can be used to mitigate conflicts between Spark’s dependencies and user dependencies. It is currently an experimental feature.
spark.python.worker.memory
512m
Amount of memory to use per python worker process during aggregation, in the same format as JVM memory strings (e.g.512m,2g). If the memory used during aggregation goes above this amount, it will spill the data into disks.
spark.executorEnv.[EnvironmentVariableName]
(none)
Add the environment variable specified byEnvironmentVariableName to the Executor process. The user can specify multiple of these and to set multiple environment variables.
spark.mesos.executor.home
driver sideSPARK_HOME
Set the directory in which Spark is installed on the executors in Mesos. By default, the executors will simply use the driver’s Spark home directory, which may not be visible to them. Note that this is only relevant if a Spark binary package is not specified throughspark.executor.uri.
spark.mesos.executor.memoryOverhead
executor memory * 0.07, with minimum of 384
This value is an additive forspark.executor.memory, specified in MiB, which is used to calculate the total Mesos task memory. A value of384 implies a 384MiB overhead. Additionally, there is a hard-coded 7% minimum overhead. The final overhead will be the larger of either spark.mesos.executor.memoryOverhead or 7% ofspark.executor.memory.
Shuffle Behavior
属性名
缺省值
意义
spark.shuffle.consolidateFiles
false
If set to “true”, consolidates intermediate files created during a shuffle. Creating fewer files can improve filesystem performance for shuffles with large numbers of reduce tasks. It is recommended to set this to “true” when using ext4 or xfs filesystems. On ext3, this option might degrade performance on machines with many (>8) cores due to filesystem limitations.
spark.shuffle.spill
true
If set to “true”, limits the amount of memory used during reduces by spilling data out to disk. This spilling threshold is specified byspark.shuffle.memoryFraction.
spark.shuffle.spill.compress
true
Whether to compress data spilled during shuffles. Compression will usespark.io.compression.codec.
spark.shuffle.memoryFraction
0.2
Fraction of Java heap to use for aggregation and cogroups during shuffles, ifspark.shuffle.spill is true. At any given time, the collective size of all in-memory maps used for shuffles is bounded by this limit, beyond which the contents will begin to spill to disk. If spills are often, consider increasing this value at the expense ofspark.storage.memoryFraction.
spark.shuffle.compress
true
Whether to compress map output files. Generally a good idea. Compression will usespark.io.compression.codec.
spark.shuffle.file.buffer.kb
32
Size of the in-memory buffer for each shuffle file output stream, in kilobytes. These buffers reduce the number of disk seeks and system calls made in creating intermediate shuffle files.
spark.reducer.maxMbInFlight
48
Maximum size (in megabytes) of map outputs to fetch simultaneously from each reduce task. Since each output requires us to create a buffer to receive it, this represents a fixed memory overhead per reduce task, so keep it small unless you have a large amount of memory.
spark.shuffle.manager
HASH
Implementation to use for shuffling data. A hash-based shuffle manager is the default, but starting in Spark 1.1 there is an experimental sort-based shuffle manager that is more memory-efficient in environments with small executors, such as YARN. To use that, change this value toSORT.
spark.shuffle.sort.bypassMergeThreshold
200
(Advanced) In the sort-based shuffle manager, avoid merge-sorting data if there is no map-side aggregation and there are at most this many reduce partitions.
Spark UI
属性名
缺省值
意义
spark.ui.port
4040
Port for your application’s dashboard, which shows memory and workload data.
spark.ui.retainedStages
1000
How many stages the Spark UI remembers before garbage collecting.
spark.ui.killEnabled
true
Allows stages and corresponding jobs to be killed from the web ui.
spark.eventLog.enabled
false
Whether to log Spark events, useful for reconstructing the Web UI after the application has finished.
spark.eventLog.compress
false
Whether to compress logged events, ifspark.eventLog.enabled is true.
spark.eventLog.dir
file:///tmp/spark-events
Base directory in which Spark events are logged, ifspark.eventLog.enabled is true. Within this base directory, Spark creates a sub-directory for each application, and logs the events specific to the application in this directory. Users may want to set this to a unified location like an HDFS directory so history files can be read by the history server.
Compression and Serialization
属性名
缺省值
意义
spark.broadcast.compress
true
Whether to compress broadcast variables before sending them.
Generally a good idea.
spark.rdd.compress
false
Whether to compress serialized RDD partitions
(e.g. forStorageLevel.
MEMORY_ONLY_SER). Can save substantial space at the cost
of some
extra CPU time.
spark.io.compression.codec
snappy
The codec used to compress internal data such as RDD
partitions and shuffle outputs. By default,
Spark provides three codecs:lz4,lzf,
andsnappy.
You can also use fully qualified class names to specify the codec, e.g.org.apache.spark.io.LZ4CompressionCodec,
in the case when Snappy compression codec is used.
Lowering this block size will also lower shuffle memory usage when Snappy is used.
spark.io.compression.lz4.block.size
32768
Block size (in bytes) used in LZ4 compression, in the case when LZ4 compression codec is used. Lowering this block size will also lower shuffle memory usage when LZ4 is used.
spark.closure.serializer
org.apache.spark.serializer.
JavaSerializer
Serializer class to use for closures. Currently only the Java serializer is supported.
spark.serializer.objectStreamReset
100
When serializing using org.apache.spark.serializer.JavaSerializer,
the serializer caches objects to prevent writing redundant data,
however that stops garbage collection of those objects.
By calling ‘reset’ you flush that info from the serializer,
and allow old objects to be collected. To turn off this periodic reset set it to -1.
By default it will reset the serializer every 100 objects.
spark.kryo.referenceTracking
true
Whether to track references to the same object when serializing data with Kryo,
which is necessary if your object graphs have loops and useful for efficiency
if they contain multiple copies of the same object.
Can be disabled to improve performance if you know this is not the case.
spark.kryo.registrationRequired
false
Whether to require registration with Kryo. If set to ‘true’, Kryo will throw an exception if an unregistered class is serialized. If set to false (the default), Kryo will write unregistered class names along with each object. Writing class names can cause significant performance overhead, so enabling this option can enforce strictly that a user has not omitted classes from registration.
spark.kryoserializer.buffer.mb
0.064
Initial size of Kryo’s serialization buffer, in megabytes. Note that there will be one bufferper core on each worker. This buffer will grow up tospark.kryoserializer.buffer.max.mb if needed.
spark.kryoserializer.buffer.max.mb
64
Maximum allowable size of Kryo serialization buffer, in megabytes. This must be larger than any object you attempt to serialize. Increase this if you get a “buffer limit exceeded” exception inside Kryo.
Execution Behavior
属性名
缺省值
意义
spark.default.parallelism
Local mode: number of cores on the local machine
Mesos fine grained mode: 8
Others: total number of cores on all executor nodes or 2, whichever is larger
Default number of tasks to use across the cluster for distributed shuffle operations (groupByKey,reduceByKey, etc) when not set by user.
Size of each piece of a block in kilobytes forTorrentBroadcastFactory. Too large a value decreases parallelism during broadcast (makes it slower); however, if it is too small,BlockManager might take a performance hit.
spark.files.overwrite
false
Whether to overwrite files added through SparkContext.addFile() when the target file exists and its contents do not match those of the source.
spark.files.fetchTimeout
false
Communication timeout to use when fetching files added through SparkContext.addFile() from the driver.
spark.storage.memoryFraction
0.6
Fraction of Java heap to use for Spark’s memory cache. This should not be larger than the “old” generation of objects in the JVM, which by default is given 0.6 of the heap, but you can increase it if you configure your own old generation size.
spark.storage.unrollFraction
0.2
Fraction ofspark.storage.memoryFraction to use for unrolling blocks in memory. This is dynamically allocated by dropping existing blocks when there is not enough free storage space to unroll the new block in its entirety.
spark.tachyonStore.baseDir
System.getProperty(“java.io.tmpdir”)
Directories of the Tachyon File System that store RDDs. The Tachyon file system’s URL is set byspark.tachyonStore.url. It can also be a comma-separated list of multiple directories on Tachyon file system.
spark.storage.memoryMapThreshold
8192
Size of a block, in bytes, above which Spark memory maps when reading a block from disk. This prevents Spark from memory mapping very small blocks. In general, memory mapping has high overhead for blocks close to or below the page size of the operating system.
spark.tachyonStore.url
tachyon://localhost:19998
The URL of the underlying Tachyon file system in the TachyonStore.
spark.cleaner.ttl
(infinite)
Duration (seconds) of how long Spark will remember any metadata (stages generated, tasks generated, etc.). Periodic cleanups will ensure that metadata older than this duration will be forgotten. This is useful for running Spark for many hours / days (for example, running 24/7 in case of Spark Streaming applications). Note that any RDD that persists in memory for more than this duration will be cleared as well.
spark.hadoop.validateOutputSpecs
true
If set to true, validates the output specification (e.g. checking if the output directory already exists) used in saveAsHadoopFile and other variants. This can be disabled to silence exceptions due to pre-existing output directories. We recommend that users do not disable this except if trying to achieve compatibility with previous versions of Spark. Simply use Hadoop’s FileSystem API to delete output directories by hand.
spark.hadoop.cloneConf
false
If set to true, clones a new HadoopConfiguration object for each task. This option should be enabled to work aroundConfigurationthread-safety issues (seeSPARK-2546 for more details). This is disabled by default in order to avoid unexpected performance regressions for jobs that are not affected by these issues.
spark.executor.heartbeatInterval
10000
Interval (milliseconds) between each executor’s heartbeats to the driver. Heartbeats let the driver know that the executor is still alive and update it with metrics for in-progress tasks.
Networking
属性名
缺省值
意义
spark.driver.host
(local hostname)
Hostname or IP address for the driver to listen on. This is used for communicating with the executors and the standalone Master.
spark.driver.port
(random)
Port for the driver to listen on. This is used for communicating with the executors and the standalone Master.
spark.fileserver.port
(random)
Port for the driver’s HTTP file server to listen on.
spark.broadcast.port
(random)
Port for the driver’s HTTP broadcast server to listen on. This is not relevant for torrent broadcast.
spark.replClassServer.port
(random)
Port for the driver’s HTTP class server to listen on. This is only relevant for the Spark shell.
spark.blockManager.port
(random)
Port for all block managers to listen on. These exist on both the driver and the executors.
spark.executor.port
(random)
Port for the executor to listen on. This is used for communicating with the driver.
spark.port.maxRetries
16
Default maximum number of retries when binding to a port before giving up.
spark.akka.frameSize
10
Maximum message size to allow in “control plane” communication (for serialized tasks and task results), in MB. Increase this if your tasks need to send back large results to the driver (e.g. usingcollect() on a large dataset).
spark.akka.threads
4
Number of actor threads to use for communication. Can be useful to increase on large clusters when the driver has a lot of CPU cores.
spark.akka.timeout
100
Communication timeout between Spark nodes, in seconds.
spark.akka.heartbeat.pauses
600
This is set to a larger value to disable failure detector that comes inbuilt akka. It can be enabled again, if you plan to use this feature (Not recommended). Acceptable heart beat pause in seconds for akka. This can be used to control sensitivity to gc pauses. Tune this in combination of spark.akka.heartbeat.interval and spark.akka.failure-detector.threshold if you need to.
spark.akka.failure-detector.threshold
300.0
This is set to a larger value to disable failure detector that comes inbuilt akka. It can be enabled again, if you plan to use this feature (Not recommended). This maps to akka’sakka.remote.transport-failure-detector.threshold. Tune this in combination ofspark.akka.heartbeat.pauses and spark.akka.heartbeat.interval if you need to.
spark.akka.heartbeat.interval
1000
This is set to a larger value to disable failure detector that comes inbuilt akka. It can be enabled again, if you plan to use this feature (Not recommended). A larger interval value in seconds reduces network overhead and a smaller value ( ~ 1 s) might be more informative for akka’s failure detector. Tune this in combination of spark.akka.heartbeat.pauses and spark.akka.failure-detector.threshold if you need to. Only positive use case for using failure detector can be, a sensistive failure detector can help evict rogue executors really quick. However this is usually not the case as gc pauses and network lags are expected in a real Spark cluster. Apart from that enabling this leads to a lot of exchanges of heart beats between nodes leading to flooding the network with those.
Scheduling
属性名
缺省值
意义
spark.task.cpus
1
Number of cores to allocate for each task.
spark.task.maxFailures
4
Number of individual task failures before giving up on the job.
Should be greater than or equal to 1.
Number of allowed retries = this value - 1.
spark.scheduler.mode
FIFO
Thescheduling mode between jobs submitted to
the same SparkContext. Can be set toFAIR to use fair
sharing instead of queueing jobs one after another.
Useful for multi-user services.
spark.cores.max
(not set)
When running on astandalone deploy cluster
or aMesos cluster in “coarse-grained” sharing mode,
the maximum amount of CPU cores to request
for the application from across the cluster (not from each machine).
If not set, the default will bespark.deploy.defaultCores on Spark’s standalone cluster manager, or infinite (all available cores) on Mesos.
spark.mesos.coarse
false
If set to “true”, runs over Mesos clusters in“coarse-grained” sharing mode,
where Spark acquires one long-lived Mesos task on each
machine instead of one Mesos task per Spark task. This gives lower-latency scheduling for short queries, but leaves resources
in use for the whole duration of the Spark job.
spark.speculation
false
If set to “true”, performs speculative execution of tasks.
This means if one or more tasks are running slowly in a stage,
they will be re-launched.
spark.speculation.interval
100
How often Spark will check for tasks to speculate, in milliseconds.
spark.speculation.quantile
0.75
Percentage of tasks which must be complete
before speculation is enabled for a particular stage.
spark.speculation.multiplier
1.5
How many times slower a task is than the median to be
considered for speculation.
spark.locality.wait
3000
Number of milliseconds to wait to launch a data-local task
before giving up and launching it on a less-local node.
The same wait will be used to step through multiple locality
levels (process-local, node-local, rack-local and then any).
It is also possible to customize the waiting time for each level by settingspark.locality.wait.node, etc.
You should increase this setting if your tasks are long
and see poor locality, but the default usually works well.
spark.locality.wait.process
spark.locality.wait
Customize the locality wait for process locality.
This affects tasks that attempt to access cached
data in a particular executor process.
spark.locality.wait.node
spark.locality.wait
Customize the locality wait for node locality.
For example, you can set this to 0 to skip node locality and search immediately for rack locality (if your cluster has rack information).
spark.locality.wait.rack
spark.locality.wait
Customize the locality wait for rack locality.
spark.scheduler.revive.interval
1000
The interval length for the scheduler to revive the worker
resource offers to run tasks (in milliseconds).
spark.scheduler.minRegisteredResourcesRatio
0
The minimum ratio of registered resources (registered resources / total expected resources)
(resources are executors in yarn mode,
CPU cores in standalone mode) to wait for before scheduling begins. Specified as a double between 0 and 1.
Regardless of whether the minimum ratio
of resources has been reached,
the maximum amount of time it will wait before scheduling begins is controlled by configspark.scheduler.maxRegisteredResourcesWaitingTime.
spark.scheduler.maxRegisteredResourcesWaitingTime
30000
Maximum amount of time to wait for resources to register before scheduling begins (in milliseconds).
spark.localExecution.enabled
false
Enables Spark to run certain jobs,
such as first() or take() on the driver,
without sending tasks to the cluster.
This can make certain jobs execute very quickly,
but may require shipping a whole partition of data to the driver.
Security
属性名
缺省值
意义
spark.authenticate
false
Whether Spark authenticates its internal connections. Seespark.authenticate.secret if not running on YARN.
spark.authenticate.secret
None
Set the secret key used for Spark to authenticate between components. This needs to be set if not running on YARN and authentication is enabled.
spark.core.connection.auth.wait.timeout
30
Number of seconds for the connection to wait for authentication to occur before timing out and giving up.
spark.core.connection.ack.wait.timeout
60
Number of seconds for the connection to wait for ack to occur before timing out and giving up. To avoid unwilling timeout caused by long pause like GC, you can set larger value.
spark.ui.filters
None
Comma separated list of filter class names to apply to the Spark web UI. The filter should be a standardjavax servlet Filter. Parameters to each filter can also be specified by setting a java system property of:
spark.<class name of filter>.params=’param1=value1,param2=value2’
For example:
-Dspark.ui.filters=com.test.filter1
-Dspark.com.test.filter1.params=’param1=foo,param2=testing’
spark.acls.enable
false
Whether Spark acls should are enabled. If enabled, this checks to see if the user has access permissions to view or modify the job. Note this requires the user to be known, so if the user comes across as null no checks are done. Filters can be used with the UI to authenticate and set the user.
spark.ui.view.acls
Empty
Comma separated list of users that have view access to the Spark web ui. By default only the user that started the Spark job has view access.
spark.modify.acls
Empty
Comma separated list of users that have modify access to the Spark job. By default only the user that started the Spark job has access to modify it (kill it for example).
spark.admin.acls
Empty
Comma separated list of users/administrators that have view and modify access to all Spark jobs. This can be used if you run on a shared cluster and have a set of administrators or devs who help debug when things work.
Spark Streaming
属性名
缺省值
意义
spark.streaming.blockInterval
200
Interval (milliseconds) at which data received by Spark Streaming receivers is coalesced into blocks of data before storing them in Spark.
spark.streaming.receiver.maxRate
infinite
Maximum rate (per second) at which each receiver will push data into blocks. Effectively, each stream will consume at most this number of records per second. Setting this configuration to 0 or a negative number will put no limit on the rate.
spark.streaming.unpersist
true
Force RDDs generated and persisted by Spark Streaming to be automatically unpersisted from Spark’s memory. The raw input data received by Spark Streaming is also automatically cleared. Setting this to false will allow the raw data and persisted RDDs to be accessible outside the streaming application as they will not be cleared automatically. But it comes at the cost of higher memory usage in Spark.
spark.executor.logs.rolling.strategy
(none)
Set the strategy of rolling of executor logs. By default it is disabled. It can be set to “time” (time-based rolling) or “size” (size-based rolling). For “time”, usespark.executor.logs.rolling.time.interval to set the rolling interval. For “size”, usespark.executor.logs.rolling.size.maxBytes to set the maximum file size for rolling.
spark.executor.logs.rolling.time.interval
daily
Set the time interval by which the executor logs will be rolled over. Rolling is disabled by default. Valid values are daily, hourly, minutely or any interval in seconds. Seespark.executor.logs.rolling.maxRetainedFiles for automatic cleaning of old logs.
spark.executor.logs.rolling.size.maxBytes
(none)
Set the max size of the file by which the executor logs will be rolled over. Rolling is disabled by default. Value is set in terms of bytes. Seespark.executor.logs.rolling.maxRetainedFiles for automatic cleaning of old logs.
spark.executor.logs.rolling.maxRetainedFiles
(none)
Sets the number of latest rolling log files that are going to be retained by the system. Older log files will be deleted. Disabled by default.
集群管理器Cluster Managers
每种集群管理都有自己额外的配置参数. 可以在下面的页面中找到每种管理器相应的配置:
YARN
Mesos
Standalone Mode
环境变量
有些Spark设置可以通过环境变量来设置, 从Spark文件夹中的conf/spark-env.sh脚本中读取(Windows操作系统中用conf/spark-env.cmd). 在Standalone 和 Mesos 模式下， 这个文件可以给机器特定的信息如hostnames. It is also sourced when running local Spark applications or submission scripts.
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