Spark

Description

spark website  

Apache Spark is a fast and general-purpose cluster computing system. It provides high-level APIs in Java, Scala, Python and R, and an optimized engine that supports general execution graphs. It also supports a rich set of higher-level tools including Spark SQL for SQL and structured data processing, MLlib for machine learning, GraphX for graph processing, and Spark Streaming.

Environment Modules

Run module spider spark to find out what environment modules are available for this application.

System Variables

• HPC_{{#uppercase:spark}}_DIR - installation directory
• HPC_{{#uppercase:spark}}_BIN - executable directory
• HPC_{{#uppercase:spark}}_SLURM - SLURM job script examples
• SPARK_HOME - examples directory

Running Spark in HiperGator

To run your Spark jobs in HiperGator, first, a Spark cluster should be created in HiperGator via SLURM. This section shows a simple example how to create a Spark cluster in HiperGator and how to submit your Spark jobs into the cluster. For details about running Spark jobs in HiperGaotr, please refer to Spark Workshop. For Spark parameters used in this section, please refer to Spark's homepage.

Spark cluster in HiperGator

Expand

Expand this section to view instructions for creating a spark cluster in HiperGator.

It is assumed that spark-local-cluster.sh is the file name of the SLURM job script for one-worker node Spark cluster in this section. Set SLURM parameters for Spark cluster.

#!/bin/bash
#filename: spark-local-cluster.sh
#SBATCH --job-name=spark_cluster
#SBATCH --nodes=1 # nodes allocated to the job
#SBATCH --cpus-per-task=16 # the number of CPUs allocated per task
#SBATCH --exclusive # not sharing of allocated nodes with other running jobs
#SBATCH --time=03:00:00
#SBATCH --output=spark_cluster.log
#SBATCH --error=spark_cluster.err

module load spark

Set Spark parameters for Spark cluster

export SPARK_LOCAL_DIRS=$HOME/spark/tmp
export SPARK_WORKER_DIR=$SPARK_LOCAL_DIRS
export SPARK_WORKER_CORES=$SLURM_CPUS_PER_TASK
export SPARK_MASTER_PORT=7077
export SPARK_MASTER_WEBUI_PORT=8080
export SPARK_NO_DAEMONIZE=true
export SPARK_LOG_DIR=$SPARK_LOCAL_DIRS
#export SPARK_CONF_DIR=$SPARK_LOCAL_DIRS
mkdir -p $SPARK_LOCAL_DIRS

Set Spark Master and Workers

MASTER_HOST=$(scontrol show hostname $SLURM_NODELIST | head -n 1)
export SPARK_MASTER_NODE=$(host $MASTER_HOST | head -1 | cut -d ' ' -f 4)
export MAX_SLAVES=$(expr $SLURM_JOB_NUM_NODES - 1)
# for starting spark master
$SPARK_HOME/sbin/start-master.sh & 
# use spark defaults for worker resources (all mem -1 GB, all cores) since using exclusive
#for starting spark worker
$SPARK_HOME/sbin/start-slave.sh spark://$SPARK_MASTER_NODE:$SPARK_MASTER_PORT

Submit the SLURM job script to HiperGator

sbatch spark-local-cluster.sh

Submit Spark jobs

Expand

Expand this section to view instructions for starting preset applications without a job script.

• Spark interactive shells in Scalar and Python
• Spark interactive shell in Scalar (spark-shell)
• Spark interactive shell in Python (pyspark)

1. Pi estimation in pyspark
2. Pi estimation from file with pyspark

• Spark-submit

1. Pi estimation
2. Wordcount