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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-5060) JDBC driver assumes executeStatement is synchronous
Date Wed, 14 Aug 2013 23:52:49 GMT

     [ https://issues.apache.org/jira/browse/HIVE-5060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brock Noland updated HIVE-5060:
-------------------------------

    Attachment: HIVE-5060.patch

Uploading the same patch under a new name so the precommit tests will run.
                
> JDBC driver assumes executeStatement is synchronous
> ---------------------------------------------------
>
>                 Key: HIVE-5060
>                 URL: https://issues.apache.org/jira/browse/HIVE-5060
>             Project: Hive
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 0.11.0
>            Reporter: Henry Robinson
>             Fix For: 0.11.1, 0.12.0
>
>         Attachments: 0001-HIVE-5060-JDBC-driver-assumes-executeStatement-is-sy.patch,
HIVE-5060.patch
>
>
> The JDBC driver seems to assume that {{ExecuteStatement}} is a synchronous call when
performing updates via {{executeUpdate}}, where the following comment on the RPC in the Thrift
file indicates otherwise:
> {code}
> // ExecuteStatement()
> //
> // Execute a statement.
> // The returned OperationHandle can be used to check on the
> // status of the statement, and to fetch results once the
> // statement has finished executing.
> {code}
> I understand that Hive's implementation of {{ExecuteStatement}} is blocking (see https://issues.apache.org/jira/browse/HIVE-4569),
but presumably other implementations of the HiveServer2 API (and I'm talking specifically
about Impala here, but others might have a similar concern) should be free to return a pollable
{{OperationHandle}} per the specification.
> The JDBC driver's {{executeUpdate}} is as follows:
> {code}
> public int executeUpdate(String sql) throws SQLException {
>     execute(sql);
>     return 0;
>   }
> {code}
> {{execute(sql)}} discards the {{OperationHandle}} that it gets from the server after
determining whether there are results to be fetched.
> This is problematic for us, because Impala will cancel queries that are running when
a session executes, but there's no easy way to be sure that an {{INSERT}} statement has completed
before terminating a session on the client.

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