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https://issues.apache.org/jira/browse/PIG-4816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Daniel Dai updated PIG-4816:
----------------------------
Status: Patch Available (was: Open)
> Read a null scalar causing a Tez failure
> ----------------------------------------
>
> Key: PIG-4816
> URL: https://issues.apache.org/jira/browse/PIG-4816
> Project: Pig
> Issue Type: Bug
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Fix For: 0.16.0
>
> Attachments: PIG-4816-1.patch
>
>
> The following script fail:
> {code}
> a = load 'studenttab10k' as (name:chararray, age:int, gpa:double);
> b = filter a by age > 100;
> c = group b all;
> d = foreach c generate COUNT(b.gpa) as count;
> e = foreach a generate (d.count IS NOT NULL? d.count : 0l);
> dump e;
> {code}
> Error stack:
> {code}
> Failure while running
> task:org.apache.pig.backend.executionengine.ExecException: ERROR 0:
> java.io.IOException: Please check if you are invoking next() even after it
> returned false. For usage, please refer to KeyValueReader javadocs
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.udf.ReadScalarsTez.attachInputs(ReadScalarsTez.java:96)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor.initializeInputs(PigProcessor.java:295)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor.run(PigProcessor.java:183)
> at
> org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:337)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:179)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:171)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable.callInternal(TezTaskRunner.java:171)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable.callInternal(TezTaskRunner.java:167)
> at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.IOException: Please check if you are invoking next() even
> after it returned false. For usage, please refer to KeyValueReader javadocs
> at
> org.apache.tez.runtime.library.api.KeyValueReader.hasCompletedProcessing(KeyValueReader.java:77)
> at
> org.apache.tez.runtime.library.common.readers.UnorderedKVReader.moveToNextInput(UnorderedKVReader.java:190)
> at
> org.apache.tez.runtime.library.common.readers.UnorderedKVReader.next(UnorderedKVReader.java:118)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.udf.ReadScalarsTez.attachInputs(ReadScalarsTez.java:81)
> ... 15 more
> {code}
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