Hi,
Please try this:
1. I used a tab-separated input file as follows:
cheolsoo@localhost:~/workspace/pig-svn $cat tag_count_ts_pro_userpair
('a','b','c','d') 3 {('2012-03-04 10:10:10'),('2013-03-04 10:10:11')}
2. My udf is as follows:
import datetime
@outputSchema("days_from_start:bag{t:tuple(cnt:int)}")
def daysFromStart(startDate, aBagOfDates):
if aBagOfDates is None: return None
result=[]
for someDate in aBagOfDates:
if someDate is None: continue
someDate = ''.join(someDate)
if len(someDate)==21: result.append(diffTime(startDate,
someDate))
return result
@outputSchema("diff:int")
def diffTime(dateFrom, dateTil):
dateSmall = datetime.datetime.strptime(dateFrom, "%Y-%m-%d %H:%M:%S")
dateBig = datetime.datetime.strptime(dateTil[1:-1], "%Y-%m-%d %H:%M:%S")
delta = dateBig - dateSmall
return delta.days
3. My pig script is as follows:
register 'udf.py' using jython as moins;
x = load 'tag_count_ts_pro_userpair' using PigStorage('\t') as (group:(),
cnt:int, times:{(chararray)});
y = foreach x generate *, moins.daysFromStart('2011-06-01 00:00:00', times);
dump y;
This returns:
(('a','b','c','d'),3,{('2012-03-04 10:10:10'),('2013-03-04
10:10:11')},{(277),(642)})
Thanks,
Cheolsoo
On Mon, Oct 1, 2012 at 7:42 AM, Björn-Elmar Macek <[email protected]>wrote:
Hi,
i am currently writing a PIG script that works with a bags of timestamp
tuples. So i am basically working on a datastructure like this:
(tuple(chararray)), int, bag{tuple(chararray)})
for example:
( ('a','b','c','d'), 3, {('2012-03-04 10:10:10'), ('2012-03-04 10:10:11')}
)
When loading the data i add a schema, so pig knows what data is coming in:
x = load 'tag_count_ts_pro_userpair' as (group:tuple(),cnt:int,times:**
bag{});
I then want to change the content of the times-bag, by replacing every
timestamp with an integer, based on the time distance to a certain date,
which i do with the follwing UDFs:
###### myUDF.py ##############
from org.apache.pig.scripting import *
import datetime
import math
@outputSchema("days_from_**start:bag{t:tuple(cnt:int)}")
def daysFromStart(startDate, aBagOfDates):
if aBagOfDates is None: return None;
result=[]
for somedate in aBagOfDates:
if somedate is None: continue
aDateString = ''.join(somedate)
#ALTERNATIVELY I USED ALSO: aDateString = ''.join(somedate[0])
// aDateString = ''.join(somedate[1])
if len(aDateString==16): result.append(diffTime(**startDate,
aDateString))
return result
@outputSchema("diff:int")
def diffTime(dateFrom,dateTil):
dateSmall = datetime.datetime.strptime(**dateFrom,"%Y-%m-%d
%H:%M:%S");
dateBig = datetime.datetime.strptime(**dateTil,"%Y-%m-%d %H:%M:%S");
delta = dateBig-dateSmall
return delta.days
##########################
I do this by executing the following command in the grunt:
y = foreach x generate *, moins.daysFromStart('2011-06-**01 00:00:00',
times);
But when i try to store y, i get the following error message:
######## LOG #############
2012-10-01 16:35:03,499 [main] ERROR
org.apache.pig.tools.pigstats.**SimplePigStats
- ERROR 2997: Unable to recreate exception from backed error:
org.apache.pig.backend.**executionengine.ExecException: ERROR 0: Error
executing function
at org.apache.pig.scripting.**jython.JythonFunction.exec(**
JythonFunction.java:106)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
expressionOperators.**POUserFunc.getNext(POUserFunc.**java:216)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
expressionOperators.**POUserFunc.getNext(POUserFunc.**java:258)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
PhysicalOperator.getNext(**PhysicalOperator.java:316)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
relationalOperators.POForEach.**processPlan(POForEach.java:**332)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
relationalOperators.POForEach.**getNext(POForEach.java:284)
at org.apache.pig.backend.hadoop.**executionengine.**mapReduceLayer.**
PigGenericMapBase.runPipeline(**PigGenericMapBase.java:271)
at org.apache.pig.backend.hadoop.**executionengine.**mapReduceLayer.**
PigGenericMapBase.map(**PigGenericMapBase.java:266)
at org.apache.pig.backend.hadoop.**executionengine.**mapReduceLayer.**
PigGenericMapBase.map(**PigGenericMapBase.java:64)
at org.apache.hadoop.mapreduce.**Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.**MapTask.runNewMapper(MapTask.**java:764)
at org.apache.hadoop.mapred.**MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.**Child$4.run(Child.java:255)
at java.security.**AccessController.doPrivileged(**Native Method)
at javax.security.auth.Subject.**doAs(Subject.java:415)
at org.apache.hadoop.security.**UserGroupInformation.doAs(**
UserGroupInformation.java:**1121)
at org.apache.hadoop.mapred.**Child.main(Child.java:249)
Caused by: Traceback (most recent call last):
File "/gpfs/home02/fb16/bmacek/**myUDF.py", line 38, in daysFromStart
aDateString = ''.join(somedate[0])
TypeError: sequence item 0: expected string, int found
at org.python.core.Py.TypeError(**Py.java:235)
at org.python.core.PyString.str_**join(PyString.java:1900)
at org.python.core.PyString$str_**join_exposer.__call__(Unknown
Source)
at org.python.core.PyObject.__**call__(PyObject.java:391)
at org.python.pycode._pyx3.**daysFromStart$3(/gpfs/home02/**
fb16/bmacek/myUDF.py:40)
at org.python.pycode._pyx3.call_**function(/gpfs/home02/fb16/**
bmacek/myUDF.py)
at org.python.core.PyTableCode.**call(PyTableCode.java:165)
at org.python.core.PyBaseCode.**call(PyBaseCode.java:301)
at org.python.core.PyFunction.**function___call__(PyFunction.**
java:376)
at org.python.core.PyFunction.__**call__(PyFunction.java:371)
at org.python.core.PyFunction.__**call__(PyFunction.java:361)
at org.python.core.PyFunction.__**call__(PyFunction.java:356)
at org.apache.pig.scripting.**jython.JythonFunction.exec(**
JythonFunction.java:103)
... 16 more
##############################
Depending on the line...
---
aDateString = ''.join(somedate)
#ALTERNATIVELY I USED ALSO: aDateString = ''.join(somedate[0])
// aDateString = ''.join(somedate[1])
---
... i get different error messages: when i use index 0, the error msg
above is given, if i use 1 it is outofbounds, and if i omit the
squarebrackets, the error message says:
2012-10-01 16:40:46,280 [main] ERROR
org.apache.pig.tools.pigstats.**SimplePigStats
- ERROR 2997: Unable to recreate exception from backed error:
org.apache.pig.backend.**executionengine.ExecException: ERROR 0: Error
executing function
at org.apache.pig.scripting.**jython.JythonFunction.exec(**
JythonFunction.java:106)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
expressionOperators.**POUserFunc.getNext(POUserFunc.**java:216)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
expressionOperators.**POUserFunc.getNext(POUserFunc.**java:258)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
PhysicalOperator.getNext(**PhysicalOperator.java:316)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
relationalOperators.POForEach.**processPlan(POForEach.java:**332)
at org.apache.pig.backend.hadoop.**executionengine.physicalLayer.**
relationalOperators.POForEach.**getNext(POForEach.java:284)
at org.apache.pig.backend.hadoop.**executionengine.**mapReduceLayer.**
PigGenericMapBase.runPipeline(**PigGenericMapBase.java:271)
at org.apache.pig.backend.hadoop.**executionengine.**mapReduceLayer.**
PigGenericMapBase.map(**PigGenericMapBase.java:266)
at org.apache.pig.backend.hadoop.**executionengine.**mapReduceLayer.**
PigGenericMapBase.map(**PigGenericMapBase.java:64)
at org.apache.hadoop.mapreduce.**Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.**MapTask.runNewMapper(MapTask.**java:764)
at org.apache.hadoop.mapred.**MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.**Child$4.run(Child.java:255)
at java.security.**AccessController.doPrivileged(**Native Method)
at javax.security.auth.Subject.**doAs(Subject.java:415)
at org.apache.hadoop.security.**UserGroupInformation.doAs(**
UserGroupInformation.java:**1121)
at org.apache.hadoop.mapred.**Child.main(Child.java:249)
Caused by: Traceback (most recent call last):
File "/gpfs/home02/fb16/bmacek/**myUDF.py", line 38, in daysFromStart
aDateString = ''.join(somedate)
TypeError: sequence item 0: expected string, array.array found
at org.python.core.Py.TypeError(**Py.java:235)
at org.python.core.PyString.str_**join(PyString.java:1900)
at org.python.core.PyString$str_**join_exposer.__call__(Unknown
Source)
at org.python.core.PyObject.__**call__(PyObject.java:391)
at org.python.pycode._pyx3.**daysFromStart$3(/gpfs/home02/**
fb16/bmacek/myUDF.py:40)
at org.python.pycode._pyx3.call_**function(/gpfs/home02/fb16/**
bmacek/myUDF.py)
at org.python.core.PyTableCode.**call(PyTableCode.java:165)
at org.python.core.PyBaseCode.**call(PyBaseCode.java:301)
at org.python.core.PyFunction.**function___call__(PyFunction.**
java:376)
at org.python.core.PyFunction.__**call__(PyFunction.java:371)
at org.python.core.PyFunction.__**call__(PyFunction.java:361)
at org.python.core.PyFunction.__**call__(PyFunction.java:356)
at org.apache.pig.scripting.**jython.JythonFunction.exec(**
JythonFunction.java:103)
... 16 more
Can anybody please tell me, what i am doing wrong here?
Thanks for your time and help in advance!
Björn
