Crail-Spark-Terasort

Crail-spark-terasort is a modified version of the original TeraSort program from https://github.com/ehiggs/spark-terasort. The original program generates, sorts, and validates 100 bytes (10b + 90b) key-value records as described by http://sortbenchmark.org/.

This version is optimized to work with the crail file system (http://crail.incubator.apache.org/), and does only sorting (and other controller experiments, see -n option in the next section).

News:

• February 19th, 2018: Code is updated to use Aapche Crail (Incubating)
• October 6th, 2017: Dependency to crail-saprk-io is updated and the pom artifact is renamed from crail-terasort to crail-spark-terasort. Spark version is bumped from 2.1 to 2.2 (however, there is no API change between these two).
• October 4th, 2017: The crail-terasort repository is renamed to crail-sprak-terasort.

crail-terasort options

The crail-terasort program takes following options :

-n,--testname <string>            Name of the test valid tests are :
                                  1. loadOnly: load and counts the input dataset
                                  2. loadStore: load the input dataset and stores it
                                  3. loadCount: load, shuffle, and then count the 
                                      resulting dataset
                                  4. loadCountStore: load, shuffle, count, and then 
                                      store the resulting dataset
                                  5. loadSort: load, shuffle, and then sort on key 
                                      the resulting dataset
                                  6. loadSortStore: load, shuffle, sort on key, then 
                                      store the resulting dataset 
                                  the default is : loadSortStore
-i,--inputDir <string>            Name of the input directory
-o,--outputDir <string>           Name of the output directory
-S,--sync <int>                   Takes 0 or 1 to pass to the sync call to the output 
                                  FS while writing (default: 0)
-p,--partitionSize <long>         Partition size, takes k,m,g,t suffixes
                                  (default: input partition size, HDFS has 128MB)
-s,--useSerializer <string>       You can use following serializers:
                                  none : uses the Spark default serializer 
                                  kryo : optimized Kryo for TeraSort 
                                  byte : a simple byte[] serializer 
                                  f22  : an optimized crail-specific byte[] serializer
                                       f22 requires CrailShuffleNativeRadixSorter
                                       (see below for details)
-b,--bufferSize <int>             Buffer size for Kryo (only valid for kryo)
-O --options <string,string>      Sets properties on the Spark context. The first 
                                  string is the key, and the second is the value
-h,--help                         Show this help

Building Crail-terasort

Apart from the dependencies of the original program, crail-terasort depends upon

• crail-client (1.0) : https://github.com/apache/incubator-crail
• crail-spark-io (1.0) : https://github.com/zrlio/crail-spark-io
• spark (2.0.0+, current build is for 2.2.0)

crail-spark-io extensions enable spark to run on the crail file system. Hence, you must build and install zrlio artifacts in your local maven repository. For details see their respective github repositories.

After that, compilation of crail-terasort is simple:

mvn -DSkipTests -T 1C install

After a successful compilation you should have crail-terasort-2.0.jar in your ./target folder. This is the crail-terasort app jar.

Building libjsort for f22 serializer (optional)

Note: These steps are optional and only for if you plan to use f22 serializer. However, please note that the best performance is only delivered by the combination of f22 with CrailShuffleNativeRadixSorter.

The f22 serializer requires the use of CrailShuffleNativeRadixSorter as the shuffle sorter. This sorter has dependencies on a native library libjsort (which builds on libboost). You can find source of libjsort is in your cloned repository and build by :

cmake .
make

These steps should give you 'libjsort.so in your directory. In case your system does not satisfy boost dependency, you can explicitly copy include/boost/sort directory from https://github.com/boostorg/sort to your libjsort src directory as boost/sort.

Then you should copy the file in your java_library_directory as defined in the $HADOOP_HOME/etc/hadoop/yarn-env.sh. As an example, we have :

export JAVA_LIBRARY_PATH=/path/to/libjsort/:$JAVA_LIBRARY_PATH

and set yarn-site.xml accordingly to something appropriate:

 <property>
        <name>yarn.nodemanager.admin-env</name>
        <value>LD_LIBRARY_PATH=/path/to/libjsort/:</value>
  </property>

Running

We assume that you have a working spark installation with crail-spark-io extensions. Here we give detail instructions about how to generate, sort, and validate crail-terasort program.

Generating data

We recommend to use the original Terasort program from Ewan Higgs to generate data : https://github.com/ehiggs/spark-terasort. Clone it, then build it by simply executing mvn -DSkipTests -T 1C install. However the original program is written for an older version of spark. Hence, we recommend you modify the pom.xml file to update the versions as :

diff --git a/pom.xml b/pom.xml
index e15c3e1..996973d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -218,9 +218,9 @@
 
 <properties>
   <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-  <scala.version>2.10.4</scala.version>
-  <scala.binary.version>2.10</scala.binary.version>
-  <spark.version>1.2.1</spark.version>
+  <scala.version>2.11.8</scala.version>
+  <scala.binary.version>2.11</scala.binary.version>
+  <spark.version>2.0.0</spark.version>
 </properties>
 
 <dependencies>

Or alternatively, simply clone the updated repository from https://github.com/animeshtrivedi/spark-terasort

To generate data use the following command (adjust according to your config):

./bin/spark-submit -v \
--num-executors 10 --executor-cores 1 --executor-memory 4G \
--master yarn --class com.github.ehiggs.spark.terasort.TeraGen \
path/to/your/sprak-terasort/target/spark-terasort-1.0.jar \
1g /terasort-input-1g

Recommendation: We recommend to use the same number of executors and partitions as you have number of machines. For example in the above command, we use it to generate 1g of dataset with 10 executors, each with 1 core, with 10 partitions. The number of partitions come from spark.default.parallelism from the $SPARK_HOME/conf/spark-defaults.conf file. We have it set as 10 for 10 machines. The output directory name is specified as /terasort-input-1g.

if you experience issues about missing dependencies, then try using spark-terasort-1.0-jar-with-dependencies.jar from the target folder.

Sorting data using crail-terasort

After generating data, you can use the following command to run crail-terasort app (adjust according to your config):

./bin/spark-submit -v \
--num-executors 10 --executor-cores 8 --executor-memory 8G --driver-memory 8G\
--master yarn --class com.ibm.crail.terasort.TeraSort \
path/to/your/crail-terasort/target/crail-terasort-2.0.jar \
-i /terasort-input-10g -o /terasort-output-10g

The default serializer is none, which means that whatever you use (spark.serializer) in $SPARK_HOME/conf/spark-defaults.conf will be used. Once you have the basic setup working, you can try using kryo or byte.

Using f22 serializer requires you to set crail-terasort specific sorter as well. You must set

spark.crail.shuffle.sorter     com.ibm.crail.terasort.sorter.CrailShuffleNativeRadixSorter
spark.crail.serializer com.ibm.crail.terasort.serializer.F22Serializer

in your $SPARK_HOME/conf/spark-defaults.conf.

Note: The f22 serializer is only compatible with CrailShuffleNativeRadixSorter!

Validating the output

Like input, for output validation we recommend to use the original program as (adjust according to your config):

./bin/spark-submit -v \
--num-executors 10 --executor-cores 8 --executor-memory 4G \
--master yarn --class com.github.ehiggs.spark.terasort.TeraValidate \
apps/jars/spark-terasort/target/spark-terasort-1.0.jar \
/terasort-output-10g

In the output you should see the following lines:

num records: 1000000000
checksum: 1dcd3a102148ad22
partitions are properly sorted

The checksum should be the same what you get if you run the Terasort program on the input directory.

Contributions

PRs are always welcome. Please fork, and make necessary modifications you propose, and let us know.

Contact

If you have questions or suggestions, feel free to post at:

https://groups.google.com/forum/#!forum/zrlio-users

or email: [email protected]