Accessing HDFS HA from spark job (UnknownHostException error)

Question

I have Apache Mesos 0.22.1 cluster (3 masters & 5 slaves), running Cloudera HDFS (2.5.0-cdh5.3.1) in HA configuration and Spark 1.5.1 framework.

When I try to spark-submit compiled HdfsTest.scala example app (from Spark 1.5.1 sources) - it fails with java.lang.IllegalArgumentException: java.net.UnknownHostException: hdfs error in executor logs. This error is only observed when I pass HDFS HA Path as an argument hdfs://hdfs/<file>, when I pass hdfs://namenode1.hdfs.mesos:50071/tesfile - everything works fine.

What I've found after enabling TRACE logging is that Spark driver actually reads hdfs://hdfs URL correctly, but Spark executor - doesn't.

My Scala app code:

import org.apache.spark._
object HdfsTest {
  def main(args: Array[String]) {
    val sparkConf = new SparkConf().setAppName("HdfsTest")
    val sc = new SparkContext(sparkConf)
    val file = sc.textFile(args(0))
    val mapped = file.map(s => s.length).cache()
    for (iter <- 1 to 10) {
      val start = System.currentTimeMillis()
      for (x <- mapped) { x + 2 }
      val end = System.currentTimeMillis()
      println("Iteration " + iter + " took " + (end-start) + " ms")
    }
    sc.stop()
   }
  }

I compile this code and submit jar file to Spark in cluster mode:

/opt/spark/bin/spark-submit --deploy-mode cluster --class com.cisco.hdfs.HdfsTest http://1.2.3.4/HdfsTest-0.0.1.jar hdfs://hdfs/testfile

My spark-defaults.conf file:

spark.master                     spark://1.2.3.4:7077
spark.eventLog.enabled           true
spark.driver.memory              1g

My spark-env.sh file:

export HADOOP_HOME=/opt/spark
export HADOOP_CONF_DIR=/opt/spark/conf

I have spark deployed on each slave in /opt/spark directory.

I can accesses HDFS using "hdfs dfs -ls hdfs://hdfs/" command in console, without the need to specify active namenode address and port.

core-site.xml:
----------------------------------------------------------------------
<configuration>
 <property>
  <name>fs.default.name</name>
  <value>hdfs://hdfs</value>
 </property>
</configuration>

hdfs-site.xml:
----------------------------------------------------------------------
<configuration>
 <property>
  <name>dfs.ha.automatic-failover.enabled</name>
  <value>true</value>
 </property>

 <property>
  <name>dfs.nameservice.id</name>
  <value>hdfs</value>
 </property>

 <property>
  <name>dfs.nameservices</name>
  <value>hdfs</value>
 </property>

 <property>
  <name>dfs.ha.namenodes.hdfs</name>
  <value>nn1,nn2</value>
 </property>

 <property>
  <name>dfs.namenode.rpc-address.hdfs.nn1</name>
  <value>namenode1.hdfs.mesos:50071</value>
 </property>

 <property>
  <name>dfs.namenode.http-address.hdfs.nn1</name>
  <value>namenode1.hdfs.mesos:50070</value>
 </property>

 <property>
  <name>dfs.namenode.rpc-address.hdfs.nn2</name>
  <value>namenode2.hdfs.mesos:50071</value>
 </property>

 <property>
  <name>dfs.namenode.http-address.hdfs.nn2</name>
  <value>namenode2.hdfs.mesos:50070</value>
 </property>

 <property>
  <name>dfs.client.failover.proxy.provider.hdfs</name>
  <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider      </value>
 </property>

 <property>
  <name>dfs.namenode.shared.edits.dir</name>
     <value>qjournal://journalnode1.hdfs.mesos:8485;journalnode2.hdfs.mesos:8485;journalnode3.hdfs.mesos:8485/hdfs</value>
   </property>

 <property>
   <name>ha.zookeeper.quorum</name>
   <value>master.mesos:2181</value>
 </property>

 <property>
  <name>dfs.journalnode.edits.dir</name>
  <value>/var/lib/hdfs/data/jn</value>
 </property>

 <property>
   <name>dfs.namenode.name.dir</name>
   <value>file:///var/lib/hdfs/data/name</value>
 </property>

 <property>
   <name>dfs.datanode.data.dir</name>
   <value>file:///var/lib/hdfs/data/data</value>
 </property>

 <property>
  <name>dfs.ha.fencing.methods</name>
  <value>shell(/bin/true)</value>
 </property>

 <property>
  <name>dfs.permissions</name>
  <value>false</value>
 </property>

 <property>
  <name>dfs.datanode.du.reserved</name>
  <value>10485760</value>
 </property>

 <property>
  <name>dfs.datanode.balance.bandwidthPerSec</name>
  <value>41943040</value>
 </property>

 <property>
   <name>dfs.namenode.safemode.threshold-pct</name>
   <value>0.90</value>
 </property>

 <property>
  <name>dfs.namenode.heartbeat.recheck-interval</name>
  <value>60000</value>
 </property>

 <property>
  <name>dfs.datanode.handler.count</name>
  <value>10</value>
 </property>

 <property>
  <name>dfs.namenode.handler.count</name>
  <value>20</value>
 </property>

 <property>
  <name>dfs.image.compress</name>
  <value>true</value>
 </property>

 <property>
  <name>dfs.image.compression.codec</name>
  <value>org.apache.hadoop.io.compress.SnappyCodec</value>
 </property>

 <property>
  <name>dfs.namenode.invalidate.work.pct.per.iteration</name>
  <value>0.35f</value>
 </property>

 <property>
  <name>dfs.namenode.replication.work.multiplier.per.iteration</name>
  <value>4</value>
 </property>

 <property>
  <name>dfs.namenode.datanode.registration.ip-hostname-check</name>
  <value>false</value>
 </property>

 <property>
   <name>dfs.client.read.shortcircuit</name>
   <value>true</value>
 </property>

 <property>
  <name>dfs.client.read.shortcircuit.streams.cache.size</name>
  <value>1000</value>
 </property>

 <property>
  <name>dfs.client.read.shortcircuit.streams.cache.size.expiry.ms</name>
   <value>1000</value>
 </property>

 <property>
  <name>dfs.domain.socket.path</name>
  <value>/var/run/hadoop-hdfs/dn._PORT</value>
 </property>
</configuration>

Answer 1

I've found the solution - adding

spark.files file:///opt/spark/conf/hdfs-site.xml,file:///opt/spark/conf/core-site.xml

to conf/spark-defaults.conf on each slave solves the problem.

After that executors successfully download core-site.xml and hdfs-site.xml from driver program to executor program.

Answer 2

Spark internally will use default conf available for fs.defaultFS, which is your local file://.

in-order it to honor HDFS HA you need to pass both core-site.xml and hdfs-site.xml to the SparkContext via the CLASSPATH, or as below (make sure these files available in the local slave nodes in the same location eg: /config/core-site.xml

For example, Spark 1.x

val sc = new SparkContext(sparkConf)

Spark 2.x

SparkSession sparkSession = SparkSession.builder().config(sparkConf).getOrCreate();
val sc = sparkSession.sparkContext()

In either case,

sc.hadoopConfiguration().addResource(new org.apache.hadoop.fs.Path("/config/core-site.xml"));
sc.hadoopConfiguration().addResource(new org.apache.hadoop.fs.Path("/config/hdfs-site.xml"));