I was able to reproduce the issue on apache hadoop with latest apache pig
trunk, so I dont think its a MapR distribution -specific issue.
The infinite looping is through this section where only empty tuples () are
being generated with STATUS_OK, without a terminating condition being set.
I could not find a related JIRA, shall I open a new one for this?
protected void runPipeline(PhysicalOperator leaf) throws IOException,
InterruptedException {
while(true){
Result res = leaf.getNextTuple();
log.debug(res.toString());
log.debug("Suhas result's return status="+ res.returnStatus);
* if(res.returnStatus==POStatus.STATUS_OK){*
* collect(outputCollector,(Tuple)res.result);*
* continue;*
* }*
if(res.returnStatus==POStatus.STATUS_EOP) {
return;
}
if(res.returnStatus==POStatus.STATUS_NULL)
continue;
if(res.returnStatus==POStatus.STATUS_ERR){
// remember that we had an issue so that in
// close() we can do the right thing
errorInMap = true;
// if there is an errmessage use it
String errMsg;
if(res.result != null) {
errMsg = "Received Error while " +
"processing the map plan: " + res.result;
} else {
errMsg = "Received Error while " +
"processing the map plan.";
}
int errCode = 2055;
ExecException ee = new ExecException(errMsg, errCode,
PigException.BUG);
throw ee;
}
}
}
=================================================================
How to interpret this physical plan from the leaf?
2014-03-12 11:32:36,609 DEBUG
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map:
*gpWeekRanked:
New For Each()[bag] *- scope-29
|
|---New For Each(false,true)[tuple] - scope-28
| |
| Project[long][0] - scope-26
| |
| Project[bag][2] - scope-27
|
|---pWeekRanked: PORank[tuple] - scope-25
| |
| Project[int][0] - scope-22
2014-03-12 11:32:36,610 INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map:
Aliases being processed per job phase*(AliasName[line,offset]):* *M:
gpWeekRanked[11,15] *C: R:
=================================================================
pig script -
tWeek = LOAD '/tmp/test_data.txt' USING PigStorage ('|') AS (WEEK:int,
DESCRIPTION:chararray, END_DATE:chararray, PERIOD:int);
gTWeek = FOREACH tWeek GENERATE WEEK AS WEEK, PERIOD AS PERIOD;
pWeek = FILTER gTWeek BY (PERIOD == 201312);
pWeekRanked = RANK pWeek BY WEEK ASC DENSE;
gpWeekRanked = FOREACH pWeekRanked GENERATE $0;
store gpWeekRanked INTO 'gpWeekRanked2';
describe gpWeekRanked2;
=================================================================
Cheers,
Suhas.
On Fri, Mar 7, 2014 at 10:20 AM, Cheolsoo Park <[email protected]> wrote:
> I just ran your script in local mode with -Dhadoopversion=20 (Hadoop 1)
> using Apache Pig.
>
> 1) Branch 0.11 and 0.12 fail with NPE
>
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.mapred.Counters.getShortName(Counters.java:669)
> at org.apache.hadoop.mapred.Counters.getGroup(Counters.java:405)
> at
>
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.saveCounters(JobControlCompiler.java:360)
> ... 12 more
>
> This is fixed in trunk.
>
> 2) Trunk works fine.
>
> So I cannot reproduce your problem. If you're using a specific distribution
> (such as MapR), it should be a distribution specific issue.
>
> Thanks,
> Cheolsoo
>
>
> On Thu, Mar 6, 2014 at 7:38 PM, Suhas Satish <[email protected]>
> wrote:
>
> > The example that reproduces the issue along with data is attached in the
> > very first email on this thread
> >
> > On Thursday, March 6, 2014, Cheolsoo Park <[email protected]> wrote:
> >
> > > So that's backend. It has nothing to do with the filter extractor. The
> > > filter extractor is for predicate push down on the frontend.
> > >
> > > The code that you're showing is the entry point where Pig mapper
> begins.
> > So
> > > it doesn't tell us much. The mapper is given a segment of physical plan
> > > (pipeline), and the getNext() call pulls records from roots to leaves
> one
> > > by one.
> > >
> > > You need to find where time is spent in the pipeline. If you're
> > suspecting
> > > Filter By is slow, then it should be POFilter. Please take thread dump
> > > multiple times and see the stack traces. Unless you provide an example
> > that
> > > reproduces the error, I cannot help you more.
> > >
> > >
> > >
> > > On Thu, Mar 6, 2014 at 6:03 PM, Suhas Satish <[email protected]
> > <javascript:;>>
> > > wrote:
> > >
> > > > Hi Cheolsoo,
> > > > This is where its hanging -
> > > > *pWeek = FILTER gTWeek BY PERIOD == $previousPeriod;*
> > > >
> > > > org/apache/pig/backend/hadoop/executionengine/mapReduceLayer/
> > > > PigGenericMapBase.java:
> > > >
> > > > protected void *runPipeline*(PhysicalOperator leaf) throws
> IOException,
> > > > InterruptedException {
> > > > while(true){
> > > > Result res = leaf.getNext(DUMMYTUPLE);
> > > > if(res.returnStatus==POStatus.STATUS_OK){
> > > > collect(outputCollector,(Tuple)res.result);
> > > > continue;
> > > > }
> > > > ....
> > > >
> > > > Cheers,
> > > > Suhas.
> > > >
> > > >
> > > > On Thu, Mar 6, 2014 at 5:56 PM, Cheolsoo Park <[email protected]>
> > > > wrote:
> > > >
> > > > > Hi Suhas,
> > > > >
> > > > > No. The issue with PIG-3461 is that Pig hangs at the query
> > compilation
> > > > with
> > > > > a big filter expression before the job is submitted.
> > > > > In addition, the filter extractor was totally rewritten in 0.12.
> > > > > https://issues.apache.org/jira/browse/PIG-3461
> > > > >
> > > > > Where exactly is your job hanging? Backend or frontend? Are you
> > running
> > > > it
> > > > > in local mode or remote mode?
> > > > >
> > > > > Thanks,
> > > > > Cheolsoo
> > > > >
> > > > > p.s.
> > > > > There are two known issues with the new filter extractor in 0.12.0
> > > > although
> > > > > these are probably not related to your issue-
> > > > > https://issues.apache.org/jira/browse/PIG-3510
> > > > > https://issues.apache.org/jira/browse/PIG-3657
> > > > >
> > > > >
> > > > > On Thu, Mar 6, 2014 at 5:30 PM, Suhas Satish <
> [email protected]
> > >
> > > > > wrote:
> > > > >
> > > > > > I seem to be hitting this issue in pig-0.12 although it claims to
> > be
> > > > > fixed
> > > > > > in pig-0.12
> > > > > > https://issues.apache.org/jira/browse/PIG-3395
> > > > > > Large filter expression makes Pig hang
> > > > > >
> > > > > > Cheers,
> > > > > > Suhas.
> > > > > >
> > > > > >
> > > > > > On Thu, Mar 6, 2014 at 4:26 PM, Suhas Satish <
> > [email protected]
> > > >
> > > > > > wrote:
> > > > > >
> > > > > > > This is the pig script -
> > > > > > >
> > > > > > > %default previousPeriod $pPeriod
> > > > > > >
> > > > > > > tWeek = LOAD '/tmp/test_data.txt' USING PigStorage ('|') AS
> > > > (WEEK:int,
> > > > > > > DESCRIPTION:chararray, END_DATE:chararray, PERIOD:int);
> > > > > > >
> > > > > > > gTWeek = FOREACH tWeek GENERATE WEEK AS WEEK, PERIOD AS PERIOD;
> > > > > > >
> > > > > > > *pWeek = FILTER gTWeek BY PERIOD == $previousPeriod;*
> > > > > > >
> > > > > > > pWeekRanked = RANK pWeek BY WEEK ASC DENSE;
> > > > > > >
> > > > > > > gpWeekRanked = FOREACH pWeekRanked GENERATE $0;
> > > > > > > store gpWeekRanked INTO 'gpWeekRanked';
> > > > > > > describe gpWeekRanked;
> > > > > > >
> > > > > > >
> > > > > > > Without the filter statement, the code runs without hanging.
> > > > > > >
> > > > > > > Cheers,
> > > > > > > Suhas.
> > > > > > >
> > > > > > >
> > > > > > > On Thu, Mar 6, 2014 at 3:05 PM, Suhas Satish <
> > > [email protected]
> > > > > > >wrote:
> > > > > > >
> > > > > > >> Hi
> > > > > > >> I launched the attached pig job on pig-12 with hadoop MRv1
> with
> > > the
> > > > > > >> attached data, but the FILTER function causes the job to get
> > stuck
> > > > in
> > > > > an
> > > > > > >> infinite loop.
> > > > > > >>
> > > > > > >> pig -p pPeriod=201312 -f test.pig
> > > > > > >>
> > > > > > >> The thread in question seems to be stuck forever inside while
> > loop
> > > > of
> > > > > > >> runPipel
> >
> >
> >
> > --
> > Cheers,
> > Suhas.
> >
>
20100101|1 WEEK ENDING 01/02/10|2010-Jan-02|201001|1468
20100102|1 WEEK ENDING 01/09/10|2010-Jan-09|201001|1469
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20100207|1 WEEK ENDING 02/13/10|2010-Feb-13|201002|1474
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20100309|1 WEEK ENDING 02/27/10|2010-Feb-27|201003|1476
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20100933|1 WEEK ENDING 08/14/10|2010-Aug-14|201009|1500
20100934|1 WEEK ENDING 08/21/10|2010-Aug-21|201009|1501
20100935|1 WEEK ENDING 08/28/10|2010-Aug-28|201009|1502
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20101245|1 WEEK ENDING 11/06/10|2010-Nov-06|201012|1512
20101246|1 WEEK ENDING 11/13/10|2010-Nov-13|201012|1513
20101247|1 WEEK ENDING 11/20/10|2010-Nov-20|201012|1514
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20110206|1 WEEK ENDING 02/05/11|2011-Feb-05|201102|1525
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20110208|1 WEEK ENDING 02/19/11|2011-Feb-19|201102|1527
20110309|1 WEEK ENDING 02/26/11|2011-Feb-26|201103|1528
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20110312|1 WEEK ENDING 03/19/11|2011-Mar-19|201103|1531
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20121037|1 WEEK ENDING 09/08/12|2012-Sep-08|201210|1608
20121038|1 WEEK ENDING 09/15/12|2012-Sep-15|201210|1609
20121039|1 WEEK ENDING 09/22/12|2012-Sep-22|201210|1610
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20121141|1 WEEK ENDING 10/06/12|2012-Oct-06|201211|1612
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20121245|1 WEEK ENDING 11/03/12|2012-Nov-03|201212|1616
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20130727|1 WEEK ENDING 06/29/13|2013-Jun-29|201307|1650
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20131248|1 WEEK ENDING 11/23/13|2013-Nov-23|201312|1671
20131349|1 WEEK ENDING 11/30/13|2013-Nov-30|201313|1672
20131350|1 WEEK ENDING 12/07/13|2013-Dec-07|201313|1673
20131351|1 WEEK ENDING 12/14/13|2013-Dec-14|201313|1674
20131352|1 WEEK ENDING 12/21/13|2013-Dec-21|201313|1675
