SAP HANA Vora: Unable to create vora table

Question

I am trying to do SAP HANA Vora installation on HDP 2.3 using Ambari 2.2 on a 5 node cluster having 1 management node, 1 master node, 2 worker nodes and 1 jump box node.

After installing all the Vora services, I was trying to validate my installation.

As per the SAP HANA Vora document, I need to create a vora table (table using com.sap.spark.vora) from spark-sql but I am getting Exception. Stack trace below.

scala> import org.apache.spark.sql.SapSQLContext
import org.apache.spark.sql.SapSQLContext

scala> val vc = new SapSQLContext(sc)
16/05/04 06:54:32 INFO SapSQLContext: SapSQLContext [version: 1.2.33] created
vc: org.apache.spark.sql.SapSQLContext = org.apache.spark.sql.SapSQLContext@69e4e90b

scala> val testsql = """
     | CREATE TABLE table001 (a1 double, a2 int, a3 string)
     | USING com.sap.spark.vora
     | OPTIONS (tablename "table001", paths "/user/vora/test.csv")"""
testsql: String =
"
CREATE TABLE table001 (a1 double, a2 int, a3 string)
USING com.sap.spark.vora
OPTIONS (tablename "table001", paths "/user/vora/test.csv")"

scala> vc.sql(testsql)
OperationException{statusCode=500, statusMessage='Internal Server Error', statusContent='No cluster leader'}
        at com.ecwid.consul.v1.health.HealthConsulClient.getHealthServices(HealthConsulClient.java:96)
        at com.ecwid.consul.v1.health.HealthConsulClient.getHealthServices(HealthConsulClient.java:80)
        at com.ecwid.consul.v1.ConsulClient.getHealthServices(ConsulClient.java:324)
        at com.sap.spark.vora.discovery.ConsulDiscoveryClient$ConsulDiscoveryClient.lookupService(ConsulDiscoveryClient.scala:45)
        at com.sap.spark.vora.config.VoraConfiguration$.apply(VoraConfiguration.scala:37)
        at com.sap.spark.vora.DefaultSource.buildConfiguration(DefaultSource.scala:403)
        at com.sap.spark.vora.DefaultSource.createRelation(DefaultSource.scala:149)
        at org.apache.spark.sql.execution.datasources.CreateTableUsingTemporaryAwareCommand.resolveDataSource(CreateTableUsingTemporaryAwareCommand.scala:73)
        at org.apache.spark.sql.execution.datasources.CreateTableUsingTemporaryAwareCommand.run(CreateTableUsingTemporaryAwareCommand.scala:31)
        at org.apache.spark.sql.execution.ExecutedCommand.sideEffectResult$lzycompute(commands.scala:57)
        at org.apache.spark.sql.execution.ExecutedCommand.sideEffectResult(commands.scala:57)
        at org.apache.spark.sql.execution.ExecutedCommand.doExecute(commands.scala:69)
        at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$5.apply(SparkPlan.scala:140)
        at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$5.apply(SparkPlan.scala:138)
        at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:147)
        at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:138)
        at org.apache.spark.sql.SQLContext$QueryExecution.toRdd$lzycompute(SQLContext.scala:933)
        at org.apache.spark.sql.SQLContext$QueryExecution.toRdd(SQLContext.scala:933)
        at org.apache.spark.sql.DataFrame.<init>(DataFrame.scala:144)
        at org.apache.spark.sql.DataFrame.<init>(DataFrame.scala:129)
        at org.apache.spark.sql.DataFrame$.apply(DataFrame.scala:51)
        at org.apache.spark.sql.SQLContext.sql(SQLContext.scala:725)
        at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:27)
        at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:32)
        at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:34)
        at $iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:36)
        at $iwC$$iwC$$iwC$$iwC.<init>(<console>:38)
        at $iwC$$iwC$$iwC.<init>(<console>:40)
        at $iwC$$iwC.<init>(<console>:42)
        at $iwC.<init>(<console>:44)
        at <init>(<console>:46)
        at .<init>(<console>:50)
        at .<clinit>(<console>)
        at .<init>(<console>:7)
        at .<clinit>(<console>)
        at $print(<console>)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
        at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1340)
        at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
        at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
        at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
        at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:857)
        at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:902)
        at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:814)
        at org.apache.spark.repl.SparkILoop.processLine$1(SparkILoop.scala:657)
        at org.apache.spark.repl.SparkILoop.innerLoop$1(SparkILoop.scala:665)
        at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:670)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:997)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
        at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
        at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
        at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:945)
        at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1059)
        at org.apache.spark.repl.Main$.main(Main.scala:31)
        at org.apache.spark.repl.Main.main(Main.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:685)
        at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)
        at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)
        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:120)
        at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

Kindly help me with this issue...

Answer 1

The error message No cluster leader indicates that the Vora Discovery Service is not running correctly. You need min 3 Discovery Servers on 3 different nodes and Discover Clients on all other nodes (never run Client and Server on the same node; they are mutually exclusive as they use the same port 8500). The Discovery Servers will elect a leader amongst themselves - according to the message this step did not happen. Likely cause is that < 3 servers are running correctly.

To solve the issue, run at least 3 Discovery Servers. Given that you have 1 master and 2 workers you probably want to run a Discovery server on each of the 3 nodes (no Discovery Clients on nodes that run Discovery Servers). The jump box should get a Discovery Clinet. For troubleshooting please see the Vora Installation and Administration Guide and the Troubleshooting Blog (section 'How to?' -> How to check the status of the Vora discovery service?)