Configuration.md

Spark Configurations for Gazelle Plugin

There are many configuration could impact the Gazelle Plugin performance and can be fine tune in Spark. You can add these configuration into spark-defaults.conf to enable or disable the setting.

Parameters	Description	Recommend Setting
spark.driver.extraClassPath	To add Arrow Data Source and Gazelle Plugin jar file in Spark Driver	/path/to/jar_file1:/path/to/jar_file2
spark.executor.extraClassPath	To add Arrow Data Source and Gazelle Plugin jar file in Spark Executor	/path/to/jar_file1:/path/to/jar_file2
spark.executorEnv.LIBARROW_DIR	To set up the location of Arrow library, by default it will search the loation of jar to be uncompressed	/path/to/arrow_library/
spark.executorEnv.CC	To set up the location of gcc	/path/to/gcc/
spark.executor.memory	To set up how much memory to be used for Spark Executor.
spark.memory.offHeap.size	To set up how much memory to be used for Java OffHeap. Please notice Gazelle Plugin will leverage this setting to allocate memory space for native usage even offHeap is disabled. The value is based on your system and it is recommended to set it larger if you are facing Out of Memory issue in Gazelle Plugin	30G
spark.sql.sources.useV1SourceList	Choose to use V1 source	avro
spark.sql.join.preferSortMergeJoin	To turn on/off preferSortMergeJoin in Spark. In gazelle we recomend to turn off this to get better performance	true
spark.plugins	To turn on Gazelle Plugin	com.intel.oap.GazellePlugin
spark.shuffle.manager	To turn on Gazelle Columnar Shuffle Plugin	org.apache.spark.shuffle.sort.ColumnarShuffleManager
spark.sql.shuffle.partitions	shuffle partition size, it's recomended to use the same number of your total cores	200
spark.oap.sql.columnar.batchscan	Enable or Disable Columnar Batchscan, default is true	true
spark.oap.sql.columnar.hashagg	Enable or Disable Columnar Hash Aggregate, default is true	true
spark.oap.sql.columnar.projfilter	Enable or Disable Columnar Project and Filter, default is true	true
spark.oap.sql.columnar.codegen.sort	Enable or Disable Columnar Sort, default is true	true
spark.oap.sql.columnar.window	Enable or Disable Columnar Window, default is true	true
spark.oap.sql.columnar.shuffledhashjoin	Enable or Disable ShffuledHashJoin, default is true	true
spark.oap.sql.columnar.sortmergejoin	Enable or Disable Columnar Sort Merge Join, default is true	true
spark.oap.sql.columnar.union	Enable or Disable Columnar Union, default is true	true
spark.oap.sql.columnar.expand	Enable or Disable Columnar Expand, default is true	true
spark.oap.sql.columnar.broadcastexchange	Enable or Disable Columnar Broadcast Exchange, default is true	true
spark.oap.sql.columnar.nanCheck	Enable or Disable Nan Check, default is true	true
spark.oap.sql.columnar.hashCompare	Enable or Disable Hash Compare in HashJoins or HashAgg, default is true	true
spark.oap.sql.columnar.broadcastJoin	Enable or Disable Columnar BradcastHashJoin, default is true	true
spark.oap.sql.columnar.sortmergejoin.lazyread	Enable or Disable lazy reading on Sort result. On disable, whole partition will be cached before doing SortMergeJoin	false
spark.oap.sql.columnar.wholestagecodegen	Enable or Disable Columnar WholeStageCodeGen, default is true	true
spark.oap.sql.columnar.preferColumnar	Enable or Disable Columnar Operators, default is false. This parameter could impact the performance in different case. In some cases, to set false can get some performance boost.	false
spark.oap.sql.columnar.joinOptimizationLevel	Fallback to row operators if there are several continous joins	18
spark.sql.execution.arrow.maxRecordsPerBatch	Set up the Max Records per Batch	10000
spark.oap.sql.execution.sort.spillThreshold	Set up the Max sort in memory threshold in bytes, default is disabled	-1
spark.oap.sql.columnar.wholestagecodegen.breakdownTime	Enable or Disable metrics in Columnar WholeStageCodeGen	false
spark.oap.sql.columnar.tmp_dir	Set up a folder to store the codegen files, default is disabled	""
spark.oap.sql.columnar.shuffle.customizedCompression.codec	Set up the codec to be used for Columnar Shuffle, default is lz4. The other option is fastpfor which can bring better perf on compressing fixed-size based contents like int	lz4
spark.oap.sql.columnar.numaBinding	Set up NUMABinding, default is false	true
spark.oap.sql.columnar.coreRange	Set up the core range for NUMABinding, only works when numaBinding set to true. The setting is based on the number of cores in your system(lscpu	grep node[0-4]). Use 72 cores as an example.

Example thrift-server configuration

Here's one example of the thrift-server configuration

THRIFTSERVER_CONFIG="--name ${runname}
--num-executors 72
--driver-memory 20g
--executor-memory 6g
--executor-cores 6
--master yarn
--deploy-mode client
--conf spark.executor.memoryOverhead=384
--conf spark.executorEnv.CC=/home/sparkuser/miniconda3/envs/arrow-new/bin/gcc
--conf spark.plugins=com.intel.oap.GazellePlugin
--conf spark.executorEnv.LD_LIBRARY_PATH=/home/sparkuser/miniconda3/envs/arrow-new/lib/:/home/sparkuser/miniconda3/envs/arrow-new/lib64/
--conf spark.executorEnv.LIBARROW_DIR=/home/sparkuser/miniconda3/envs/arrow-new
--conf spark.driver.extraClassPath=${nativesql_jars}
--conf spark.executor.extraClassPath=${nativesql_jars}
--conf spark.shuffle.manager=org.apache.spark.shuffle.sort.ColumnarShuffleManager
--conf spark.sql.join.preferSortMergeJoin=false
--conf spark.sql.inMemoryColumnarStorage.batchSize=${batchsize}
--conf spark.sql.execution.arrow.maxRecordsPerBatch=${batchsize}
--conf spark.sql.parquet.columnarReaderBatchSize=${batchsize}
--conf spark.sql.autoBroadcastJoinThreshold=10M
--conf spark.sql.broadcastTimeout=600
--conf spark.sql.crossJoin.enabled=true
--conf spark.driver.maxResultSize=20g
--hiveconf hive.server2.thrift.port=10001
--hiveconf hive.server2.thrift.bind.host=sr270
--conf spark.sql.codegen.wholeStage=true
--conf spark.sql.shuffle.partitions=432
--conf spark.memory.offHeap.enabled=true
--conf spark.memory.offHeap.size=15g
--conf spark.kryoserializer.buffer.max=128m
--conf spark.kryoserializer.buffer=32m
--conf spark.oap.sql.columnar.preferColumnar=false
--conf spark.oap.sql.columnar.sortmergejoin.lazyread=true
--conf spark.sql.execution.sort.spillThreshold=2147483648
--conf spark.executorEnv.LD_PRELOAD=/home/sparkuser/miniconda3/envs/arrow-new/lib/libjemalloc.so
--conf spark.executorEnv.MALLOC_CONF=background_thread:true,dirty_decay_ms:0,muzzy_decay_ms:0,narenas:2
--conf spark.executorEnv.MALLOC_ARENA_MAX=2
--conf spark.oap.sql.columnar.numaBinding=true
--conf spark.oap.sql.columnar.coreRange=0-35,72-107|36-71,108-143
--conf spark.oap.sql.columnar.joinOptimizationLevel=18
--conf spark.oap.sql.columnar.shuffle.customizedCompression.codec=lz4
--conf spark.yarn.appMasterEnv.LD_PRELOAD=/home/sparkuser/miniconda3/envs/arrow-new/lib/libjemalloc.so"

Below is an example for spark-default.conf, if you are using conda to install OAP project.

Example spark-defaults.conf

spark.sql.sources.useV1SourceList avro
spark.sql.join.preferSortMergeJoin false
spark.plugins com.intel.oap.GazellePlugin
spark.shuffle.manager org.apache.spark.shuffle.sort.ColumnarShuffleManager

# note Gazelle Plugin depends on arrow data source
spark.driver.extraClassPath $HOME/miniconda2/envs/oapenv/oap_jars/spark-columnar-core-<version>-jar-with-dependencies.jar:$HOME/miniconda2/envs/oapenv/oap_jars/spark-arrow-datasource-standard-<version>-jar-with-dependencies.jar
spark.executor.extraClassPath $HOME/miniconda2/envs/oapenv/oap_jars/spark-columnar-core-<version>-jar-with-dependencies.jar:$HOME/miniconda2/envs/oapenv/oap_jars/spark-arrow-datasource-standard-<version>-jar-with-dependencies.jar

spark.executorEnv.LIBARROW_DIR      $HOME/miniconda2/envs/oapenv
spark.executorEnv.CC                $HOME/miniconda2/envs/oapenv/bin/gcc
######

Before you start spark, you must use below command to add some environment variables.

export CC=$HOME/miniconda2/envs/oapenv/bin/gcc
export LIBARROW_DIR=$HOME/miniconda2/envs/oapenv/

Notes on driver

In gazelle spark driver is used to C++ code generation for different operators. This means driver takes more tasks than vanilla Spark, so it's better to consider allocate more resource to driver. By default, driver will compile C++ codes with best optimizations targeting for local CPU architecture:

-O3 -march=native

This could be override by a local environment variable before starting driver:

export CODEGEN_OPTION=" -O1 -mavx2 -fno-semantic-interposition "