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hdp-tez's Introduction

Apache Tez

Apache Tez is a generic data-processing pipeline engine envisioned as a low-level engine for higher abstractions such as Apache Hadoop Map-Reduce, Apache Pig, Apache Hive etc.

At its heart, tez is very simple and has just two components:

  • The data-processing pipeline engine where-in one can plug-in input, processing and output implementations to perform arbitrary data-processing. Every 'task' in tez has the following:
  • Input to consume key/value pairs from.
  • Processor to process them.
  • Output to collect the processed key/value pairs.
  • A master for the data-processing application, where-by one can put together arbitrary data-processing 'tasks' described above into a task-DAG to process data as desired. The generic master is implemented as a Apache Hadoop YARN ApplicationMaster.

hdp-tez's People

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Watchers

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hdp-tez's Issues

Hadoop version value is hardcoded in Tez pom.xml

The pom.xml in Tez contains the hadoop.version value set as 2.7.1-SNAPSHOT

<hadoop.version>2.7.1-SNAPSHOT</hadoop.version>

On ppc, this causes components which use Tez as a dependency to fail as the hadoop.version value cannot be set to the ppc version of hadoop.

For example, Oozie build failed for Hadoop dependency in Tez due to the same reason:
[ERROR] Failed to execute goal on project oozie-sharelib-pig: Could not resolve dependencies for project org.apache.oozie:oozie-sharelib-pig:jar:4.2.0: Failed to collect dependencies at org.apache.tez:tez-mapreduce:jar:0.7.1-SNAPSHOT -> org.apache.tez:tez-api:jar:0.7.1-SNAPSHOT -> org.apache.hadoop:hadoop-aws:jar:2.7.1-SNAPSHOT: Failed to read artifact descriptor for org.apache.hadoop:hadoop-aws:jar:2.7.1-SNAPSHOT: Could not transfer artifact org.apache.hadoop:hadoop-aws:pom:2.7.1-SNAPSHOT from/to apache.snapshots.repo (https://repository.apache.org/content/groups/snapshots)

Tez-dag: TestVertexImpl fails with random test cases intermittently

Following test cases fails on Power without any defined sequence.

TestVertexImpl.testVertexWithOneToOneSplitWhileRunning:3842->initAllVertices:2401 expected: but was:
TestVertexImpl.testVertexTaskAttemptOutputFailure:3322 expected:<OUTPUT_WRITE_ERROR> but was:<UNKNOWN_ERROR>
TestVertexImpl.testVertexVMErrorReport:3922->initAllVertices:2401 expected: but was:
TestVertexImpl.testInputInitializerEventsMultipleSources:4190->startVertex:2413->startVertex:2426 expected: but was:
TestVertexImpl.testInputInitializerEventsAtNew:4393->startVertex:2413->startVertex:2431 expected: but was:
TestVertexImpl.testVertexWithOneToOneSplit:3780 expected: but was:

**Failure details:**
estVertexWithOneToOneSplitWhileRunning(org.apache.tez.dag.app.dag.impl.TestVertexImpl)  Time elapsed: 0.05 sec  <<< FAILURE!
java.lang.AssertionError: expected:<INITED> but was:<NEW>
        at org.junit.Assert.fail(Assert.java:88)
        at org.junit.Assert.failNotEquals(Assert.java:743)
        at org.junit.Assert.assertEquals(Assert.java:118)
        at org.junit.Assert.assertEquals(Assert.java:144)
        at org.apache.tez.dag.app.dag.impl.TestVertexImpl.initAllVertices(TestVertexImpl.java:2401)
        at org.apache.tez.dag.app.dag.impl.TestVertexImpl.testVertexWithOneToOneSplitWhileRunning(TestVertexImpl.java:3842)

testVertexTaskAttemptOutputFailure(org.apache.tez.dag.app.dag.impl.TestVertexImpl)  Time elapsed: 0.043 sec  <<< FAILURE!
java.lang.AssertionError: expected:<OUTPUT_WRITE_ERROR> but was:<UNKNOWN_ERROR>
        at org.junit.Assert.fail(Assert.java:88)
        at org.junit.Assert.failNotEquals(Assert.java:743)
        at org.junit.Assert.assertEquals(Assert.java:118)
        at org.junit.Assert.assertEquals(Assert.java:144)
        at org.apache.tez.dag.app.dag.impl.TestVertexImpl.testVertexTaskAttemptOutputFailure(TestVertexImpl.java:3322)

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