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https://issues.apache.org/jira/browse/HIVE-18227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Dai updated HIVE-18227:
------------------------------
    Attachment: HIVE-18227.3.patch

> Tez parallel execution fail
> ---------------------------
>
>                 Key: HIVE-18227
>                 URL: https://issues.apache.org/jira/browse/HIVE-18227
>             Project: Hive
>          Issue Type: Bug
>          Components: Tez
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>            Priority: Major
>         Attachments: HIVE-18227.1.patch, HIVE-18227.2.patch, 
> HIVE-18227.3.patch
>
>
> Running tez Dag in parallel within a session fail. Here is the test case:
> {code}
> set hive.exec.parallel=true;
> set hive.merge.tezfiles=true;
> set tez.grouping.max-size=100000;
> set tez.grouping.min-size=10000;
> from student
> insert overwrite table student4 select *
> insert overwrite table student5 select *
> insert overwrite table student6 select *;
> {code}
> The merge task run in parallel and result the exception:
> {code}
> org.apache.tez.dag.api.TezException: App master already running a DAG
>         at 
> org.apache.tez.dag.app.DAGAppMaster.submitDAGToAppMaster(DAGAppMaster.java:1255)
>         at 
> org.apache.tez.dag.api.client.DAGClientHandler.submitDAG(DAGClientHandler.java:118)
>         at 
> org.apache.tez.dag.api.client.rpc.DAGClientAMProtocolBlockingPBServerImpl.submitDAG(DAGClientAMProtocolBlockingPBServerImpl.java:161)
>         at 
> org.apache.tez.dag.api.client.rpc.DAGClientAMProtocolRPC$DAGClientAMProtocol$2.callBlockingMethod(DAGClientAMProtocolRPC.java:7471)
>         at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2273)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2269)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>         at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1724)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2267)
> {code}



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