Agens Spark Modules

• Agens Spark Cypher
• Agens Spark Connector
• Agens Livy Jobs
• Agens Hive Storage Handler

build

cd agens-spark-modules

mvn clean install

pre-requirement

• java 1.8
• scala 2.11
  • important: es-hadoop cannot support scala 2.12
• elasticsearch 7.9.0 (> 7.0.0)
  • vertexIndex
  • edgeIndex
• hadoop 2.10.0
  • dfs
  • yarn
  • mkdir /user/agens, /user/agens/temp
  • copy 'default.avsc' to hdfs//:/user/agens
• spark 2.4.6 (< 3.0.0)
  • master
  • slaves
• hive 2.3.7 (< 3.0.0)
  • hiveserver2
  • metastore
• livy 0.7.0
  • livy-server
• zeppelin 0.8.2
  • zeppelin-daemon

deploy

# for spark
cp spark-connector/target/agens-spark-connector-1.0-dev.jar ${extraJars}
cp livy-jobs/target/agens-livy-jobs-1.0-dev.jar ${extraJars}

# for hive
cp hive-storage-handler/target/agens-hive-storage-handler-1.0-dev.jar ${extraJars}

config

spark

spark/conf/spark-defaults.conf

## spark.agens.* properties for AgensConf
spark.agens.host            ${esHost}
spark.agens.port            9200
spark.agens.vertexIndex     agensvertex
spark.agens.edgeIndex       agensedge
spark.agens.tempPath        /user/agens/temp
spark.agens.user            elastic
spark.agens.password        bitnine

spark.driver.extraClassPath     ${extraJars}/agens-spark-connector-1.0-dev.jar:${extraJars}/agens-livy-jobs-1.0-dev.jar
spark.executor.extraClassPath   ${extraJars}/agens-spark-connector-1.0-dev.jar:${extraJars}/agens-livy-jobs-1.0-dev.jar

hive

hive/conf/hive-site.xml

<property>
  <name>agens.spark.path</name>
  <value>/user/agens/temp</value>
</property>
<property>
  <name>agens.spark.livy</name>
  <value>http://minmac:8998</value>
</property>

hive/conf/hive-env.sh

export HIVE_AUX_JARS_PATH=${extraJars}/agens-hive-storage-handler-1.0-dev.jar

zeppelin

zeppelin/conf/zeppelin-env.sh

export SPARK_SUBMIT_OPTIONS="--jars ${extraJars}/agens-spark-connector-1.0-dev.jar"

run

• run batch by Spark Submit
• run interactive by Spark Shell with Zeppelin
• create table through hive-storage-handler, livy

run batch

## for TEST
spark-submit --executor-memory 1g \
    --master spark://minmac:7077 \
    --class net.bitnine.agens.spark.Agens \
    target/agens-spark-connector-1.0-dev.jar

## for IMPORT

run interactive (zeppelin)

import net.bitnine.agens.spark.Agens.ResultsAsDF
import net.bitnine.agens.spark.AgensBuilder

val agens = AgensBuilder(spark)
        .host("minmac")
        .port("29200")
        .user("elastic")
        .password("bitnine")
        .vertexIndex("agensvertex")
        .edgeIndex("agensedge")
        .build
val datasource = "modern"

//////////////////////////////////

val graphModern = agens.graph(datasource)

agens.catalog.store("modern", graphModern)

val result1 = agens.cypher("FROM GRAPH session.modern MATCH (n) RETURN n")
result1.show
val result2 = agens.cypher("FROM GRAPH session.modern MATCH ()-[e]-() RETURN e")
result2.show

//////////////////////////////////

val result3 = graphModern.cypher("""|MATCH (a:person)-[r:knows]->(b)
                                    |RETURN a.name, b.name, r.weight
                                    |ORDER BY a.name""".stripMargin)
result3.show

// Spark SQL: temp Table => managed Table
val df3 = result3.asDataFrame
val tblName = "modern_temp3"

df3.createOrReplaceTempView(tblName)
spark.sql(s"create table avro_${tblName} stored as avro as select * from ${tblName}")
spark.sql(s"select * from avro_${tblName}").show

agens.catalog.dropGraph(datasource)

run hive

CREATE external TABLE modern_test1
STORED BY 'net.bitnine.agens.hive.AgensHiveStorageHandler'
TBLPROPERTIES(
'avro.schema.url'='hdfs://minmac:9000/user/agens/default.avsc',
'agens.spark.datasource'='modern',
'agens.spark.query'='match (a:person)-[b]-(c:person) return distinct a.id_, a.name, a.age, a.country, b.label, c.name'
);