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FW: Query hangs at 99.97 % for one reducer in Hive
Forwarding message to hadoop list as well for any help. Appreciate any help

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Siddharth Tiwari

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"Every duty is holy, and devotion to duty is the highest form of worship of God.”

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From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Query hangs at 99.97 % for one reducer in Hive
Date: Sun, 2 Mar 2014 23:09:25 +0000
Hi team,
following query hangs at 99.97% for one reducer, kindly help or point to what can be cause
drop table if exists sample.dpi_short_lt;create table sample.dpi_short_lt asselect                   b.msisdn,                a.area_erb,                a.longitude,                a.latitude,                               substring(b.msisdn,1,2) as country,                               substring(b.msisdn,3,2) as area_code,                               substring(b.start_time,1,4) as year,                               substring(b.start_time,6,2) as month,                               substring(b.start_time,9,2) as day,                               substring(b.start_time,12,2) as hour,                               cast(b.procedure_duration as double) as duracao_ms,                               cast(b.internet_latency as double) as int_internet_latency,                               cast(b.ran_latency as double) as int_ran_latency,                               cast(b.http_latency as double) as int_http_latency,                               (case when b.internet_latency='' then 1 else 0 end) as internet_latency_missing,                               (case when b.ran_latency='' then 1 else 0 end) as ran_latency_missing,                               (case when b.http_latency='' then 1 else 0 end) as http_latency_missing,                               (cast(b.mean_throughput_ul as int) * cast( procedure_duration as int) / 1000) as total_up_bytes,                               (cast(b.mean_throughput_dl as int) * cast(procedure_duration as int)  / 1000) as total_dl_bytes,                               cast(b.missing_packets_ul as int) as int_missing_packets_ul,                               cast(b.missing_packets_dl as int) as int_missing_packets_dlfrom sample.dpi_large bleft outer join sample.science_new aon b.cgi = regexp_replace(a.codigo_cgi_ecgi,'-','')where msisdn!='';
Hive was heuristically selecting 1000 reducers and it was hanging at 99.97 percent on one reduce task. I then changed the above values to 3GB per reducer and 500 reducers and started hitting this error.
java.lang.RuntimeException: Hive Runtime Error while closing operators: Unable to rename output from: hdfs://tlvcluster/tmp/hive-hadoop/hive_2014-03-01_03-14-36_812_8390586541316719852-1/_task_tmp.-ext-10001/_tmp.000003_0 to: hdfs://tlvcluster/tmp/hive-hadoop/hive_2014-03-01_03-14-36_812_8390586541316719852-1/_tmp.-ext-10001/000003_0
at org.apache.hadoop.hive.ql.exec.ExecReducer.close(ExecReducer.java:313)
at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:516)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:447)
at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
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:1408)
at org.apache.hadoop.mapred.Child.main(Child.java:262)
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to rename output from: hdfs://tlvcluster/tmp/hive-hadoop/hive_2014-03-01_03-14-36_812

I have 22 node cluster running cdh 4.3. Please try to locate what can be teh issue.

*------------------------*

Cheers !!!

Siddharth Tiwari

Have a refreshing day !!!
"Every duty is holy, and devotion to duty is the highest form of worship of God.”

"Maybe other people will try to limit me but I don't limit myself"