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Known Hadoop Errors

This section lists errors in the Hadoop components that might effect RapidMiner Radoop process execution. If there is a workaround for an issue, it's also described here.

General Hadoop errors

When using a Radoop Proxy or a SOCKS Proxy, HDFS operations may fail

The cause is HDFS-3068
Affects: probably newer Hadoop versions, and is still unresolved
Error message (during Full Test or file upload):
java.lang.IllegalStateException: Must not use direct buffers with InputStream API
Workaround is to add this property to Advanced Hadoop Parameters: dfs.client.use.legacy.blockreader with a value of true

Windows client does not work with Linux cluster on Hadoop 2.2 (YARN)

The cause is YARN-1824
Affects: Hadoop 2.2 - YARN, with Windows client and Linux cluster
The import test fails, with the single line in the log: /bin/bash: /bin/java: No such file or directory
Setting mapreduce.app-submission.cross-platform to false changes the error message to "No job control"
There is no workaround for this issue, upgrading to Hadoop 2.4+ is recommended.

AccessControlException in log messages

The cause is HADOOP-11808
Warning message is WARN Client: Exception encountered while connecting to the server : org.apache.hadoop.security.AccessControlException: Client cannot authenticate via:[TOKEN, KERBEROS]
This message doesn't affect the execution or the results of the process.

General Hive errors

SocketTimeoutException: Read timed out is thrown when using Hive-on-Spark

When Hive-on-Spark is used with Spark Dynamic Allocation disabled, the parsing of a HiveQL command may start a SparkSession, and during that period other requests may fail. See HIVE-17532.
Affects: Hive with Hive-on-Spark enabled
Solution: enabling Spark Dynamic Allocation in the Hive service avoids this issue. Note that SocketTimeoutException may still be thrown for other reasons, please consult your Hadoop support in that case.

IllegalMonitorStateException is thrown during process execution

Probably the cause is HIVE-9598. Usually occurs after long period of inactivity on the Studio interface, or if the HiveServer2 service is changed or restarted.
Affects: Hive 0.13 (may affect earlier releases), said to be fixed in Hive 0.14
Error message example:

java.lang.RuntimeException: java.lang.IllegalMonitorStateException
        at eu.radoop.datahandler.hive.HiveHandler.runFastScriptTimeout(HiveHandler.java:761)
        at eu.radoop.datahandler.hive.HiveHandler.runFastScriptsNoParams(HiveHandler.java:727)
        at eu.radoop.datahandler.hive.HiveHandler.runFastScript(HiveHandler.java:654)
        at eu.radoop.datahandler.hive.HiveHandler.dropIfExists(HiveHandler.java:1853) ...
        Caused by: java.lang.IllegalMonitorStateException
        at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(Unknown Source)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(Unknown Source)
        at java.util.concurrent.locks.ReentrantLock.unlock(Unknown Source)
        at org.apache.hive.jdbc.HiveStatement.execute(HiveStatement.java:239)

Workaround: Re-opening the process in Studio may solve it. If not, a Studio restart should solve it. If this is a constant issue on your cluster, please upgrade to a Hive version where this issue has been fixed (see ticket above).

Hive job fails with MapredLocalTask error

Hive may start a so-called local task to perform a JOIN. If there is an error during this local work (typically, an out of memory error), it may only return an error code and not a proper error message.
Affects: Hive 0.13.0, Hive 1.0.0, Hive 1.1.0 and potentially other versions
Error message example (return code may differ): return code 3 from org.apache.hadoop.hive.ql.exec.mr.MapredLocalTask
See full error message in /tmp/hive/ local directory, by default, on the cluster node that performed the task.
Workaround: check whether the Join operator in your process uses the appropriate keys, so the result set does not explode. If the Join is defined correctly, add the following key-value pair to the Advanced Hive Parameters list for your connection: key hive.auto.convert.join with value false.

Hive job fails with Kryo serializer error

The cause is probably the same as for HIVE-7711
Affects: Hive 1.1.0 and potentially other versions
Error message: org.apache.hive.com.esotericsoftware.kryo.KryoException: Unable to find class: [...]
Workaround: process re-run might help. Adding the following key-value pair to Advanced Hive Parameters list for the connection prevents this type of error: key hive.plan.serialization.format with value javaXML. Please note, that starting from Hive 2.0, kryo is the only supported serialization format. See Hive-12609 and Hive Configuration Properties for more information.
Manually installing RapidMiner Radoop functions prevents this type of error.

Hive job fails with NoClassDefFoundError error

The cause is addressed in HIVE-2573, this patch is included in CDH 5.4.3
Affects: CDH 5.4.0 to CDH 5.4.2
Error message: java.sql.SQLException: java.lang.NoClassDefFoundError: [...]
Error message in HiveServer2 log: java.lang.RuntimeException: java.lang.NoClassDefFoundError: [...]
Solution: process re-run may help, but an upgrade to CDH 5.4.3 is the permanent solution.
Manually installing RapidMiner Radoop functions also prevents this type of error.

Hive job fails before completion

Probably the cause is HIVE-4605
Affects: Hive 0.13.1 and below
Error message: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask
Error message in HiveServer2 log: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to rename output from [...] .hive-staging_hive_[...] to: .hive-staging_hive_...
There is no known workaround, please re-run the process preferably without any concurrent read from the same Hive table.

JOIN may lead to NullPointerException in CDH

The cause may be HIVE-3872, but there are no MAP JOIN hints
Usually some kind of self join of a complex view leads to this error
Workaround: use Materialize Data (or Multiply) before the Join operator (in case of multiple Joins, you may have to find out exactly which is the first Join that leads to this error, and materialize right before it)

Number of connections to Zookeeper reaches the maximum allowed

The cause is that each HiveServer2 "client" creates a new connection to Zookeeper: HIVE-4132, HIVE-6375
Affects Hive 0.10 and several newer versions.
After the maximum number (default is 60, Radoop can easily reach that) is reached, HiveServer2 becomes inaccessible, since its connection attempt to Zookeeper fails. A HiveServer2 or Zookeeper restart is required in this case.
Workaround: increase maxClientCnxns property of Zookeeper, e.g. to 500.

Non latin1 characters may cause encoding issues when used in a filter clause or in a script

The cause is that RapidMiner Radoop relies heavily on Hive VIEW objects. The code of a VIEW is stored in the Hive Metastore database, which is an arbitrary relational database usually created during the Hadoop cluster install. If this database does not handle the character encoding well, then the RapidMiner Radoop interface will also have issues.
Affects: Hive Metastore DB created by default MySQL scripts, and it may affect other databases as well
Workaround: your Hadoop administrator can test if your Hive Metastore database can deal with the desired encoding. A Hive VIEW, created through Beeline, that contains a filter clause with non latin1 characters should return the expected result set when used as a source object in a SELECT query. Please contact your Hadoop support regarding enconding issues with Hive.

Confidence values are missing or predicted label may be shown incorrectly (e.g. after a Discretize operator)

This issue probably comes up only if Hive Metastore is installed on MySQL relational database with latin1 character set as database default and the label contains special multibyte UTF-8 characters, like the infinity symbol (∞) that a Discretize operator uses.
Affects: Hive Metastore DB created by default MySQL scripts, and it may affect other databases as well
Workaround: your Hadoop administrator can test if your Hive Metastore database can deal with the desired encoding. A Hive VIEW, created through Beeline, that contains a filter clause with non latin1 characters should return the expected result set when used as a source object in a SELECT query. Please contact your Hadoop support regarding enconding issues with Hive.

Attribute roles and binominal mappings may be lost when storing in a Hive table with non-default format

The cause is HIVE-6681
Probably it is fixed in Hive 0.13
As the roles and the binominal mappings are stored in column comments, when these are replaced with 'from deserializer", the roles are lost.

PARQUET format may cause Hive to fail

There are several related issues, one of them is HIVE-6375
Affects: Hive 0.13 is said to be fixed, but may still have issues like HIVE-6938
CREATE TABLE AS SELECT statement fails with MapRedTask return code 2; or we get NullPointerException; or we get ArrayIndexOutOfBoundsException because of column name issues
Workaround is to use different format. Materialize Data operator may not be enough, as the CTAS statement gives the error.

Hive may hang while parsing large queries

When submitting large queries to the Hive parser, the execution may stop and later fail or never recover.
Workaround: This issue usually happens with the Apply Model operator with very large models (like Trees). Set the use general applier parameter to true to avoid the large queries but get the same result.

Unable to cancel certain Hive-on-Spark queries

The cause is HIVE-13626
The YARN application can be stuck in RUNNING state on the cluster if the query is canceled immediately after it is submitted.
This issue can be experienced by chance when a process using Hive-on-Spark is stopped.
To resolve the situation, one can kill the job manually.

Starting a Hive-on-Spark job fails due to timeout

The hive.spark.client.server.connect.timeout property is set to 90000ms by default. This may be short for a Hive-on-Spark job to start, especially when multiple jobs are waiting for execution (e.g. parallel execution of processes).
A dedicated error message explains this issue.
The property value can be modified only in hive-site.xml cluster configuration file.

SemanticException View xxx is corresponding to LIMIT, rather than a SelectOperator

The cause is HIVE-17415
Affects: Hive 2.3 - 2.4, appears to be fixed in Hive version 2.5 and above
User is attempting to create a VIEW with a LIMIT parameter and this is not allowed in the hive version
This is most often seen when using the Filter Example Range operator or when a LIMIT is specified in the Hive Script operator

General Impala errors

Impala may return empty results when DISTINCT or COUNT(DISTINCT ..) expressions are used

There are a lot of similar bug tickets.
Seems to only come up when an INSERT is used (Store in Hive operator). The DISTINCT expression may be used in Aggregate or Remove Duplicates operators.
A related issue: Impala still does not support multiple COUNT(DISTINCT ..) expressions IMPALA-110

General MapR errors

Error util.Shell: Failed to locate the winutils binary in the hadoop binary path
Or
java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.

Both these errors indicate that the environment variable HADOOP_HOME is not set correctly.
Most often seen on Windows system, when the HADOOP_HOME environment variable is not set.
Set the HADOOP_HOME system-wide environment variable to the location of the hadoop directory. A normal MapR install this will be %MAPR_HOME%/hadoop/hadoop-x.y.z, where x.y.z is the hadoop version.

java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Ljava/lang/String;I)Z

Error message indicates, unable to find approrate binary libraries.
Most often seen in Windows system, when the PATH does not contain the binaries located at %HADOOP_HOME%\bin.
Workaround is to check that the HADOOP_HOME system-wide environment variable is set correctly, and append %HADOOP_BIN%\bin to the system-wide environment variable PATH.

java.lang.ClassCastException: com.mapr.fs.MapRFileSystem cannot be cast to org.apache.hadoop.hdfs.DistributedFileSystem

Error indicates the hive table LOCATION was specified by hdfs://, the expected value is maprfs://
This most often occurs when using the Store in Hive operator with a MapR 6.1 cluster, when the advanced option checkbox of external table is checked and the location textfield is specified with hdfs://
Workaround is to specify a location on the Store in Hive operator prefixed with maprfs:// and not hdfs://

General Spark errors

Spark Script with Hive access fails with "GSS initiate failed" when user impersonation is enabled

When using Spark 1.5 or Spark 1.6 versions and user impersonation in the Radoop connection, a Spark Script operator that has enable Hive access set to true may fail with security error.
Cause is SPARK-13478.
Workaround is to update Spark on the cluster.

Spark 2.0.1 is unable to create database

On Spark 2.0.1, the execution fails with the following exception: "Unable to create database default as failed to create its directory hdfs://"...
Cause is SPARK-17810.
Affects only Spark 2.0.1. Please use Spark 2.0.0 or upgrade to Spark 2.0.2 or later.
Workaround is to add spark.sql.warehouse.dir as an Advanced Spark Parameter with a path that begins with "file:/". This is not expected to work on Windows.

Spark job may fail with relatively large ORC input data

Error message is "Size exceeds Integer.MAX_VALUE"
The cause is SPARK-1476
Workaround is using Text input format. The bug may occur with Text format too if the HDFS blocks are large.

Reading the output of Spark Script may fail for older Hive versions if the DataFrame contains too many null values

The Spark job succeeds, but reading the output parquet table fails with NullPointerException.
Affects Hive 1.1 and below. The cause is PARQUET-136.
Workaround is using the fillna() function on the output DataFrame (Python API, R API)

Exception in Spark job may not fail the process if no output connection is defined.

An exception occured in the Spark script but the Spark job succeeds. If the operator has no output, the process succeeds.
Cause is SPARK-7736 and SPARK-10851.
Affects Spark 1.5.x. Fixed in Spark 1.5.1 for Python, Spark 1.6.0 for R. The exception can be checked in the ApplicationMaster logs on the Resource Manager web interface.
Workaround is upgrading to Spark 1.5.1/1.6.0 or making a dummy output connection and returning a (small) dummy dataset.

Spark Error InvalidAuxServiceException: The auxService:spark_shuffle does not exist

Typically caused when a Spark Resource Allocation Policy for a connection is selected to be Dynamic, but the Hadoop cluster that Spark is running on is not setup for Dynamic Resource Allocation.
Either adjust Hadoop cluster to have Dynamic Resource Allocation accordingly or change Spark Resource Allocation Policy for the connection in the connection editor.

Spark Error java.lang.StackOverflowError on executor side

This is a general error, which can be caused by multiple problems, but there is a known Spark issue among the possible causes. It can be identified by a very large Java deserialization stack trace, with lots of ObjectInputStream calls. Random Forest and Decision Tree are known to be affected, but you might also experience this problem with other Spark operators as well. Example error snippet:

  java.lang.StackOverflowError
  at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2956)
  at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1736)
  at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2040)
  at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1571)
  at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2285)
  at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2209)
  at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2067)
  at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1571)
  at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2285)
  at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2209)
  at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2067)
  at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1571)
  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431)
  at scala.collection.immutable.List$SerializationProxy.readObject(List.scala:479)
  at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)

The issue is caused by the deserialization process exceeding the available stack size inside the executor process. A possible solution to the problem is increasing the executor stack size, by adding the following key-value pair to Advanced Spark Parameters spark.executor.extraJavaOptions with the value of -Xss4m, and making sure that spark.driver.extraJavaOptions has the same value. The -Xss value is a parameter used to set the the java runtime thread-stack size, see basic java documents.

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