Murshid Chalaev created PIG-5019:
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Summary: Pig generates tons of warnings for udf with enabled
warnings aggregation
Key: PIG-5019
URL: https://issues.apache.org/jira/browse/PIG-5019
Project: Pig
Issue Type: Bug
Components: internal-udfs
Affects Versions: 0.14.0
Reporter: Murshid Chalaev
For data set containing 9 lines the aggregated warning message is displayed
{code}
2016-09-01 19:40:33,664 [main] WARN
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
- Encountered Warning UDF_WARNING_1 6 time(s).
{code}
but in contained logs I see a separate log message "Cannot
extract group for input" for every not matching value
{code}
2016-09-01 19:40:28,115 INFO [main]
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map:
Aliases being processed per job phase (AliasName[line,offset]): M
: b[10,4],b[-1,-1],extract_fields[17,17] C: R:
2016-09-01 19:40:28,122 WARN [main]
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigHadoopLogger:
org.apache.pig.builtin.REGEX_EXTRACT(UDF_WARNING_1): RegexExtrac
t : Cannot extract group for input /v1=1&v3=9
2016-09-01 19:40:28,124 WARN [main]
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigHadoopLogger:
org.apache.pig.builtin.REGEX_EXTRACT(UDF_WARNING_1): RegexExtrac
t : Cannot extract group for input /v2=3&v3=7
2016-09-01 19:40:28,124 WARN [main]
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigHadoopLogger:
org.apache.pig.builtin.REGEX_EXTRACT(UDF_WARNING_1): RegexExtract : Cannot
extract group for input /v1=4&v3=6
2016-09-01 19:40:28,125 WARN [main]
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigHadoopLogger:
org.apache.pig.builtin.REGEX_EXTRACT(UDF_WARNING_1): RegexExtract : Cannot
extract group for input /v2=5&v3=5
2016-09-01 19:40:28,125 WARN [main]
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigHadoopLogger:
org.apache.pig.builtin.REGEX_EXTRACT(UDF_WARNING_1): RegexExtract : Cannot
extract group for input /v1=8&v3=2
2016-09-01 19:40:28,125 WARN [main]
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigHadoopLogger:
org.apache.pig.builtin.REGEX_EXTRACT(UDF_WARNING_1): RegexExtract : Cannot
extract group for input /v3=9&v2=1
{code}
It does not log the warning messages in the task logs.
The patch for PIG-2207 was committed to
Pig 0.13+
In 0.12 we had a single counter for all UDF warnings, but in 0.13+ we have
separate counter and message for every unique warning log line.
Two lines below are unique
/v2=3&v3=7
/v1=4&v3=6
That's why Pig print both of them to the console.
Printing a separate log message for every data line slows down the overall
performance as well.
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