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https://issues.apache.org/jira/browse/HIVE-2869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245801#comment-13245801
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Ashutosh Chauhan commented on HIVE-2869:
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@Shrijeet, Take a look at
https://cwiki.apache.org/confluence/display/Hive/HowToContribute on how to
contribute. Essentially, you need to submit a patch.
> Merging small files throws RuntimeException when hive.mergejob.maponly=false
> ----------------------------------------------------------------------------
>
> Key: HIVE-2869
> URL: https://issues.apache.org/jira/browse/HIVE-2869
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.8.0
> Environment: CentOS release 5.5 (Final)
> Reporter: Shrijeet Paliwal
> Attachments: data_to_reproduce.tar.gz
>
>
> Hive Version: Hive 0.8 (last commit SHA
> b581a6192b8d4c544092679d05f45b2e50d42b45 )
> Hadoop version : chd3u0
> Trying to use the hive merge small file feature by setting all the necessary
> params.
> Have disabled use of CombineHiveInputFormat since my input is compressed
> text.
> {noformat}
> hive> set mapred.min.split.size.per.node=1000000000;
> hive> set mapred.min.split.size.per.rack=1000000000;
> hive> set mapred.max.split.size=1000000000;
> hive> set hive.merge.size.per.task=1000000000;
> hive> set hive.merge.smallfiles.avgsize=1000000000;
> hive> set hive.merge.size.smallfiles.avgsize=1000000000;
> hive> set hive.merge.mapfiles=true;
> hive> set hive.merge.mapredfiles=true;
> hive> set hive.mergejob.maponly=false;
> {noformat}
> The plan decides to launch two MR jobs but after first job succeeds I get
> runt time error
> "java.lang.RuntimeException: Plan invalid, Reason: Reducers == 0 but reduce
> operator specified"
> *How to reproduce :*
> * Creare tables as follows :
> {code}
> --create input table
> create table tmp_notmerged (
> id int,
> name string
> )
> ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t'
> STORED AS TEXTFILE;
> --create o/p table
> create table tmp_merged (
> id int
> )
> STORED AS TEXTFILE;
> {code}
> * Load data into tmp_notmerged (find files attached in with this jira)
> * set knobs and fire hive query
> {code}
> set hive.merge.mapfiles=true;
> set hive.mergejob.maponly=false;
> insert overwrite table tmp_merged select id from tmp_notmerged;
> {code}
> * You should see error "java.lang.RuntimeException: Plan invalid, Reason:
> Reducers == 0 but reduce operator specified"
> *Proposed fix :*
> Patch is here : https://gist.github.com/2025303
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