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From "Amruth S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4617) Asynchronous execution in HiveServer2 to run a query in non-blocking mode
Date Wed, 30 Mar 2016 06:28:25 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217491#comment-15217491
] 

Amruth S commented on HIVE-4617:
--------------------------------

Hi, I am trying to asynchronously run queries in hive.

Essentially I want to 
- Initiate an execution and get an operation handle.
- Persist the operation handle elsewhere.
- De-serialize the handle, poll for status and results.

Lets say there is a process P1 which initiates a query asynchronously. Ideally if the operation
handle is shared, any other process should be able to poll for status and results. This *does
not not happen if I use the binary thrift protocol (tcp)*.  As soon as the process which initiated
the asynchronous request disconnects, the operation handle in hive server seem to get cleaned
up. (deleteContext gets called which in turn closes the session)

    @Override
    public void deleteContext(ServerContext serverContext,
        TProtocol input, TProtocol output) {
      Metrics metrics = MetricsFactory.getInstance();
      if (metrics != null) {
        try {
          metrics.decrementCounter(MetricsConstant.OPEN_CONNECTIONS);
        } catch (Exception e) {
          LOG.warn("Error Reporting JDO operation to Metrics system", e);
        }
      }
      ThriftCLIServerContext context = (ThriftCLIServerContext) serverContext;
      SessionHandle sessionHandle = context.getSessionHandle();
      if (sessionHandle != null) {
        LOG.info("Session disconnected without closing properly, close it now");
        try {
          cliService.closeSession(sessionHandle);
        } catch (HiveSQLException e) {
          LOG.warn("Failed to close session: " + e, e);
        }
      }
    }


But if I use the HTTP thrift transport mode, this does not happen and I am able to accomplish
my use-case successfully.
Ideally shouldn't the working and functionality be irrespective of the underlying transport
mode (?)

> Asynchronous execution in HiveServer2 to run a query in non-blocking mode
> -------------------------------------------------------------------------
>
>                 Key: HIVE-4617
>                 URL: https://issues.apache.org/jira/browse/HIVE-4617
>             Project: Hive
>          Issue Type: Improvement
>          Components: HiveServer2
>    Affects Versions: 0.12.0
>            Reporter: Jaideep Dhok
>            Assignee: Vaibhav Gumashta
>             Fix For: 0.12.0
>
>         Attachments: HIVE-4617.D12417.1.patch, HIVE-4617.D12417.2.patch, HIVE-4617.D12417.3.patch,
HIVE-4617.D12417.4.patch, HIVE-4617.D12417.5.patch, HIVE-4617.D12417.6.patch, HIVE-4617.D12507.1.patch,
HIVE-4617.D12507.2.patch, HIVE-4617.D12507.3.patch, HIVE-4617.D12507.4.patch, HIVE-4617.D12507.5.patch,
HIVE-4617.D12507.6.patch, HIVE-4617.D12507Test.1.patch, HIVE-4617.D12783.1.patch
>
>
> Provide a way to run a queries asynchronously. Current executeStatement call blocks until
the query run is complete.



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