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Posted to dev@hive.apache.org by "Henry Robinson (JIRA)" <ji...@apache.org> on 2013/08/14 01:20:48 UTC
[jira] [Updated] (HIVE-5060) JDBC driver assumes executeStatement
is synchronous
[ https://issues.apache.org/jira/browse/HIVE-5060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Henry Robinson updated HIVE-5060:
---------------------------------
Attachment: 0001-HIVE-5060-JDBC-driver-assumes-executeStatement-is-sy.patch
This patch adds polling to the DML path in {{executeStatement}}.
> 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
> Attachments: 0001-HIVE-5060-JDBC-driver-assumes-executeStatement-is-sy.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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