Join two streaming relations hang in local mode
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Key: PIG-1204
URL: https://issues.apache.org/jira/browse/PIG-1204
Project: Pig
Issue Type: Bug
Affects Versions: 0.5.0
Reporter: Richard Ding
Assignee: Richard Ding
Fix For: 0.7.0
The following script hangs running in local mode when inpuf files contains
many lines (e.g. 10K). The same script works when runing in MR mode.
{code}
A = load 'input1' as (a0, a1, a2);
B = stream A through `head -1` as (a0, a1, a2);
C = load 'input2' as (a0, a1, a2);
D = stream C through `head -1` as (a0, a1, a2);
E = join B by a0, D by a0;
dump E
{code}
Here is one stack trace:
"Thread-13" prio=10 tid=0x09938400 nid=0x1232 in Object.wait()
[0x8fffe000..0x8ffff030]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x9b8e0a40> (a
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStream)
at java.lang.Object.wait(Object.java:485)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStream.getNextHelper(POStream.java:291)
- locked <0x9b8e0a40> (a
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStream)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStream.getNext(POStream.java:214)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:272)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNext(POLocalRearrange.java:256)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POUnion.getNext(POUnion.java:162)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:232)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:227)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:52)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:583)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:176)
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