Jarek Jarcec Cecho created PIG-3830:
---------------------------------------
Summary: HiveColumnarLoader throwing FileNotFoundException on
Hadoop 2
Key: PIG-3830
URL: https://issues.apache.org/jira/browse/PIG-3830
Project: Pig
Issue Type: Bug
Affects Versions: 0.12.0
Reporter: Jarek Jarcec Cecho
Assignee: Jarek Jarcec Cecho
Fix For: 0.13.0
I've noticed that {{HiveColumnarLoader}} will thrown
{{java.io.FileNotFoundException}} when used with glob path on Hadoop 2.0. It
will run just fine on Hadoop 1.0:
{code}
Failed to parse: java.io.FileNotFoundException: File
/home/jarcec/cloudera/repos/pig/contrib/piggybank/java/simpleDataDir1395623312698/*.txt
does not exist
at
org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:198)
at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1676)
at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1623)
at org.apache.pig.PigServer.registerQuery(PigServer.java:575)
at org.apache.pig.PigServer.registerQuery(PigServer.java:588)
at
org.apache.pig.piggybank.test.storage.TestHiveColumnarLoader.testHdfdsGlobbing(TestHiveColumnarLoader.java:220)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at junit.framework.TestCase.runTest(TestCase.java:176)
at junit.framework.TestCase.runBare(TestCase.java:141)
at junit.framework.TestResult$1.protect(TestResult.java:122)
at junit.framework.TestResult.runProtected(TestResult.java:142)
at junit.framework.TestResult.run(TestResult.java:125)
at junit.framework.TestCase.run(TestCase.java:129)
at junit.framework.TestSuite.runTest(TestSuite.java:255)
at junit.framework.TestSuite.run(TestSuite.java:250)
at
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:518)
at
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1052)
at
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:906)
Caused by: java.lang.RuntimeException: java.io.FileNotFoundException: File
/home/jarcec/cloudera/repos/pig/contrib/piggybank/java/simpleDataDir1395623312698/*.txt
does not exist
at
org.apache.hadoop.fs.RawLocalFileSystem.listStatus(RawLocalFileSystem.java:362)
at org.apache.hadoop.fs.FileSystem.listStatus(FileSystem.java:1484)
at org.apache.hadoop.fs.FileSystem.listStatus(FileSystem.java:1524)
at
org.apache.hadoop.fs.ChecksumFileSystem.listStatus(ChecksumFileSystem.java:564)
at
org.apache.pig.piggybank.storage.partition.PathPartitioner.getPartitionKeys(PathPartitioner.java:105)
at
org.apache.pig.piggybank.storage.partition.PathPartitionHelper.getPartitionKeys(PathPartitionHelper.java:101)
at
org.apache.pig.piggybank.storage.HiveColumnarLoader.getPartitionColumns(HiveColumnarLoader.java:576)
at
org.apache.pig.piggybank.storage.HiveColumnarLoader.getSchema(HiveColumnarLoader.java:646)
at
org.apache.pig.newplan.logical.relational.LOLoad.getSchemaFromMetaData(LOLoad.java:175)
at
org.apache.pig.newplan.logical.relational.LOLoad.<init>(LOLoad.java:89)
at
org.apache.pig.parser.LogicalPlanBuilder.buildLoadOp(LogicalPlanBuilder.java:853)
at
org.apache.pig.parser.LogicalPlanGenerator.load_clause(LogicalPlanGenerator.java:3479)
at
org.apache.pig.parser.LogicalPlanGenerator.op_clause(LogicalPlanGenerator.java:1536)
at
org.apache.pig.parser.LogicalPlanGenerator.general_statement(LogicalPlanGenerator.java:1013)
at
org.apache.pig.parser.LogicalPlanGenerator.statement(LogicalPlanGenerator.java:553)
at
org.apache.pig.parser.LogicalPlanGenerator.query(LogicalPlanGenerator.java:421)
at
org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:188)
... 20 more
Caused by: java.io.FileNotFoundException: File
/home/jarcec/cloudera/repos/pig/contrib/piggybank/java/simpleDataDir1395623312698/*.txt
does not exist
... 37 more
{code}
I've dived into the problem and found a difference in Hadoop implementation of
{{DistributedFileSystem}}. For non existing directory method {{listStatus}}
will return {{null}} in [Hadoop
1|https://github.com/apache/hadoop-common/blob/branch-1/src/hdfs/org/apache/hadoop/hdfs/DistributedFileSystem.java#L316]:
{code}
if (thisListing == null) { // the directory does not exist
return null;
}
{code}
But will thrown an exception in [Hadoop
2|https://github.com/apache/hadoop-common/blob/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java#L653]:
{code}
if (thisListing == null) { // the directory does not exist
throw new FileNotFoundException("File " + p + " does not exist.");
}
{code}
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