[PIG-2791] Pig does not work with ViewFileSystem

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.10.0
• Component/s: grunt

Environment

Pig QE

• Assignee: Rohini Palaniswamy
• Reporter: patrick white
• Created: 06/Jul/12 22:29
• Updated: 02/May/13 02:29
• Resolved: 27/Aug/12 20:49

Description

The Yahoo Pig QE team ran into a blocking issue when trying to test Client-Side Mount Tables, on a Federated cluster with two NNs, this blocks Pig Testing on Federation.

Federation relies strongly on the use of CSMT with viewFS, QE found that in this configuration it is not possible to enter grunt shell because Pig makes a call to getDefaultReplication() on the fs, which is ambiguous over viewFS and causes core to throw a org.apache.hadoop.fs.viewfs.NotInMountpointException: "getDefaultReplication on empty path is invalid".

This in turn cause Pig to exit with an internal error as follows:

2012-07-06 22:20:25,657 [main] INFO org.apache.pig.Main - Apache Pig version 0.10.1.0.1206081058 (r1348169) compiled Jun 08 2012, 17:58:42
2012-07-06 22:20:26,074 [main] WARN org.apache.hadoop.conf.Configuration - mapred.used.genericoptionsparser is deprecated. Instead, use mapreduce.client.genericoptionsparser.used
2012-07-06 22:20:26,076 [main] INFO org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: viewfs:///
2012-07-06 22:20:26,080 [main] WARN org.apache.hadoop.conf.Configuration - fs.default.name is deprecated. Instead, use fs.defaultFS
2012-07-06 22:20:26,522 [main] ERROR org.apache.pig.Main - ERROR 2999: Unexpected internal error. getDefaultReplication on empty path is invalid
2012-07-06 22:20:26,522 [main] WARN org.apache.pig.Main - There is no log file to write to.
2012-07-06 22:20:26,522 [main] ERROR org.apache.pig.Main - org.apache.hadoop.fs.viewfs.NotInMountpointException: getDefaultReplication on empty path is invalid
at org.apache.hadoop.fs.viewfs.ViewFileSystem.getDefaultReplication(ViewFileSystem.java:482)
at org.apache.pig.backend.hadoop.datastorage.HDataStorage.init(HDataStorage.java:77)
at org.apache.pig.backend.hadoop.datastorage.HDataStorage.<init>(HDataStorage.java:58)
at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.init(HExecutionEngine.java:205)
at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.init(HExecutionEngine.java:118)
at org.apache.pig.impl.PigContext.connect(PigContext.java:208)
at org.apache.pig.PigServer.<init>(PigServer.java:246)
at org.apache.pig.PigServer.<init>(PigServer.java:231)
at org.apache.pig.tools.grunt.Grunt.<init>(Grunt.java:47)
at org.apache.pig.Main.run(Main.java:487)
at org.apache.pig.Main.main(Main.java:111)

Issue Links

• breaks: PIG-2930 ant test doesn't compile in trunk
• depends upon: HADOOP-8430 Backport new FileSystem methods introduced by HADOOP-8014 to branch-1
• is related to: HIVE-3645 RCFileWriter does not implement the right function to support Federation