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From Irfan Mohammed <irfan...@gmail.com>
Subject cannot start the transform script. reason : "argument list too long"
Date Tue, 01 Mar 2011 16:22:03 GMT
Hi,

I have a hive script [given below] which calls a python script using
transform and for large datasets [ > 100M rows ], the reducer is not able to
start the python process and the error message is "argument list too long".
The detailed error stack is given below.

The python script takes only 1 static argument "hbase". For small datasets [
1M rows ], the script works fine.

   1. Is this problem related to the number of open file handles on the
   reducer box?
   2. How do I get the correct error message?
   3. Is there a way to get to the actual unix process with arguments it is
   instantiating?

Thanks,
Irfan

>>>>>>>>>>>>>> script >>>>>>>>>>>>>>>>>>>>>>>>>>>

true && echo "
set hive.exec.compress.output=true;
set io.seqfile.compression.type=BLOCK;
set mapred.output.compression.type=BLOCK;
set mapred.output.compression.codec=org.apache.hadoop.io.compress.GzipCodec;

set hive.merge.mapfiles=false;
set hive.exec.dynamic.partition=true;
set hive.exec.dynamic.partition.mode=nonstrict;
set hive.exec.max.dynamic.partitions=20000;

set hive.map.aggr=true;
set mapred.reduce.tasks=200;

add file /home/irfan/scripts/user_id_output.py;

from (
  select
    user_id,
    source_id,
    load_id,
    user_id_json,
    pid
  from
    user_id_bucket
  where
        1 = 1
    and length(user_id) = 40
  distribute by pid
  sort by user_id, load_id desc
) T1
insert overwrite table user_id_hbase_stg1 partition (pid)
SELECT
  transform
  (
      T1.user_id
    , T1.source_id
    , T1.load_id
    , T1.user_id_json
    , T1.pid
  )
  using 'python2.6 user_id_output.py hbase'
  as user_id, user_id_info1, user_id_info2, user_id_info3, user_id_info4,
user_id_info5, user_id_info3, pid
;

" > ${SQL_FILE};

true && ${HHIVE} -f ${SQL_FILE} 1>${TXT_FILE} 2>${LOG_FILE};

>>>>>>>>>>>>>> error log >>>>>>>>>>>>>>>>>>>>>>>>>

2011-03-01 14:46:13,705 INFO org.apache.hadoop.hive.ql.exec.ExtractOperator:
Initializing Self 5 OP
2011-03-01 14:46:13,711 INFO org.apache.hadoop.hive.ql.exec.ExtractOperator:
Operator 5 OP initialized
2011-03-01 14:46:13,711 INFO org.apache.hadoop.hive.ql.exec.ExtractOperator:
Initializing children of 5 OP
2011-03-01 14:46:13,711 INFO org.apache.hadoop.hive.ql.exec.SelectOperator:
Initializing child 6 SEL
2011-03-01 14:46:13,711 INFO org.apache.hadoop.hive.ql.exec.SelectOperator:
Initializing Self 6 SEL
2011-03-01 14:46:13,711 INFO org.apache.hadoop.hive.ql.exec.SelectOperator:
SELECT
struct<_col0:string,_col1:string,_col2:string,_col3:string,_col4:string>
2011-03-01 14:46:13,711 INFO org.apache.hadoop.hive.ql.exec.SelectOperator:
Operator 6 SEL initialized
2011-03-01 14:46:13,711 INFO org.apache.hadoop.hive.ql.exec.SelectOperator:
Initializing children of 6 SEL
2011-03-01 14:46:13,711 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
Initializing child 7 SCR
2011-03-01 14:46:13,711 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
Initializing Self 7 SCR
2011-03-01 14:46:13,728 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
Operator 7 SCR initialized
2011-03-01 14:46:13,728 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
Initializing children of 7 SCR
2011-03-01 14:46:13,728 INFO
org.apache.hadoop.hive.ql.exec.FileSinkOperator: Initializing child 8 FS
2011-03-01 14:46:13,728 INFO
org.apache.hadoop.hive.ql.exec.FileSinkOperator: Initializing Self 8 FS
2011-03-01 14:46:13,730 INFO
org.apache.hadoop.hive.ql.exec.FileSinkOperator: Operator 8 FS initialized
2011-03-01 14:46:13,730 INFO
org.apache.hadoop.hive.ql.exec.FileSinkOperator: Initialization Done 8 FS
2011-03-01 14:46:13,730 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
Initialization Done 7 SCR
2011-03-01 14:46:13,730 INFO org.apache.hadoop.hive.ql.exec.SelectOperator:
Initialization Done 6 SEL
2011-03-01 14:46:13,730 INFO org.apache.hadoop.hive.ql.exec.ExtractOperator:
Initialization Done 5 OP
2011-03-01 14:46:13,733 INFO ExecReducer: ExecReducer: processing 1 rows:
used memory = 89690888
2011-03-01 14:46:13,733 INFO org.apache.hadoop.hive.ql.exec.ExtractOperator:
5 forwarding 1 rows
2011-03-01 14:46:13,733 INFO org.apache.hadoop.hive.ql.exec.SelectOperator:
6 forwarding 1 rows
2011-03-01 14:46:13,733 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
Executing [/usr/bin/python2.6, user_id_output.py, hbase]
2011-03-01 14:46:13,733 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
tablename=null
2011-03-01 14:46:13,733 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
partname=null
2011-03-01 14:46:13,733 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
alias=null
2011-03-01 14:46:13,777 FATAL ExecReducer:
org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while
processing row
(tag=0) {"key":{"reducesinkkey0":"AA11223344","reducesinkkey1":"20110210_02"},"value":{"_col0":"xxxxx","_col1":"m1","_col2":"20110210_02","_col3":"{'m07':
'x12', 'm02': 'x34', 'm01': 'm45'}","_col4":"0A9"},"alias":0}
at org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:253)
at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:467)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:415)
at org.apache.hadoop.mapred.Child$4.run(Child.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1063)
at org.apache.hadoop.mapred.Child.main(Child.java:211)
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Cannot
initialize ScriptOperator
at
org.apache.hadoop.hive.ql.exec.ScriptOperator.processOp(ScriptOperator.java:320)
at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:457)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:697)
at
org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:84)
at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:457)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:697)
at
org.apache.hadoop.hive.ql.exec.ExtractOperator.processOp(ExtractOperator.java:45)
at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:457)
at org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:244)
... 7 more
Caused by: java.io.IOException: Cannot run program "/usr/bin/python2.6":
java.io.IOException: error=7, Argument list too long
at java.lang.ProcessBuilder.start(ProcessBuilder.java:459)
at
org.apache.hadoop.hive.ql.exec.ScriptOperator.processOp(ScriptOperator.java:279)
... 15 more
Caused by: java.io.IOException: java.io.IOException: error=7, Argument list
too long
at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
at java.lang.ProcessImpl.start(ProcessImpl.java:65)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:452)
... 16 more

2011-03-01 14:46:13,779 WARN org.apache.hadoop.mapred.Child: Error running
child
java.lang.RuntimeException:
org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while
processing row
(tag=0) {"key":{"reducesinkkey0":"AA11223344","reducesinkkey1":"20110210_02"},"value":{"_col0":"xxxxx","_col1":"m1","_col2":"20110210_02","_col3":"{'m07':
'x12', 'm02': 'x34', 'm01': 'm45'}","_col4":"0A9"},"alias":0}
at org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:265)
at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:467)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:415)
at org.apache.hadoop.mapred.Child$4.run(Child.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1063)
at org.apache.hadoop.mapred.Child.main(Child.java:211)
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime
Error while processing row
(tag=0) {"key":{"reducesinkkey0":"AA11223344","reducesinkkey1":"20110210_02"},"value":{"_col0":"xxxxx","_col1":"m1","_col2":"20110210_02","_col3":"{'m07':
'x12', 'm02': 'x34', 'm01': 'm45'}","_col4":"0A9"},"alias":0}
at org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:253)
... 7 more
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Cannot
initialize ScriptOperator
at
org.apache.hadoop.hive.ql.exec.ScriptOperator.processOp(ScriptOperator.java:320)
at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:457)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:697)
at
org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:84)
at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:457)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:697)
at
org.apache.hadoop.hive.ql.exec.ExtractOperator.processOp(ExtractOperator.java:45)
at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:457)
at org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:244)
... 7 more
Caused by: java.io.IOException: Cannot run program "/usr/bin/python2.6":
java.io.IOException: error=7, Argument list too long
at java.lang.ProcessBuilder.start(ProcessBuilder.java:459)
at
org.apache.hadoop.hive.ql.exec.ScriptOperator.processOp(ScriptOperator.java:279)
... 15 more
Caused by: java.io.IOException: java.io.IOException: error=7, Argument list
too long
at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
at java.lang.ProcessImpl.start(ProcessImpl.java:65)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:452)
... 16 more
2011-03-01 14:46:13,784 INFO org.apache.hadoop.mapred.Task: Runnning cleanup
for the task

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