[jira] [Resolved] (DRILL-6816) NPE - Concurrent query execution using PreparedStatement

["Vitalii Diravka (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-6816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vitalii Diravka resolved DRILL-6816.
------------------------------------
    Resolution: Invalid
      Assignee: Vitalii Diravka

I have already checked and I confirm {{stmt.executeQuery()}} works just fine.

> NPE - Concurrent query execution using PreparedStatement 
> ---------------------------------------------------------
>
>                 Key: DRILL-6816
>                 URL: https://issues.apache.org/jira/browse/DRILL-6816
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.14.0
>            Reporter: Khurram Faraaz
>            Assignee: Vitalii Diravka
>            Priority: Major
>         Attachments: test_tbl.json
>
>
> Concurrent query execution from JDBC program using PreparedStatement results in NPE.
> Queries that were executed concurrently are (part of a query file),
> {noformat}
> select id from `test_tbl.json`
> select count(id) from `test_tbl.json`
> select count(*) from `test_tbl.json`
> select * from `test_tbl.json`
> {noformat}
> Drill 1.14.0
>  git.commit.id=35a1ae23c9b280b9e73cb0f6f01808c996515454
>  MapR version => 6.1.0.20180911143226.GA (secure cluster)
> JDBC driver used was org.apache.drill.jdbc.Driver
> Executing the above queries concurrently using a Statement object results in successful query execution.
> {noformat}
> Statement stmt = conn.createStatement();
> ResultSet rs = stmt.executeQuery(query);
> {noformat}
> However, when the same queries listed above are executed using a PreparedStatement object we see an NPE
> {noformat}
> PreparedStatement prdstmnt = conn.prepareStatement(query);
> prdstmnt.executeUpdate();
> {noformat}
> Stack trace from drillbit.log
> {noformat}
> 17:04:32.941 [pool-1-thread-3] DEBUG o.a.d.j.impl.DrillStatementRegistry - Adding to open-statements registry: org.apache.drill.jdbc.impl.DrillJdbc41Factory$DrillJdbc41PreparedStatement@35757005
> 17:04:32.941 [pool-1-thread-2] DEBUG o.a.d.j.impl.DrillStatementRegistry - Adding to open-statements registry: org.apache.drill.jdbc.impl.DrillJdbc41Factory$DrillJdbc41PreparedStatement@d4413b8
> 17:04:32.956 [pool-1-thread-1] DEBUG o.a.d.j.impl.DrillStatementRegistry - Adding to open-statements registry: org.apache.drill.jdbc.impl.DrillJdbc41Factory$DrillJdbc41PreparedStatement@5eb3b9ab
> 17:04:32.956 [pool-1-thread-4] DEBUG o.a.d.j.impl.DrillStatementRegistry - Adding to open-statements registry: org.apache.drill.jdbc.impl.DrillJdbc41Factory$DrillJdbc41PreparedStatement@d9367d0
> java.lang.NullPointerException
>  at java.util.Objects.requireNonNull(Objects.java:203)
>  at org.apache.calcite.avatica.Meta$MetaResultSet.create(Meta.java:577)
>  at org.apache.drill.jdbc.impl.DrillMetaImpl.execute(DrillMetaImpl.java:1143)
>  at org.apache.drill.jdbc.impl.DrillMetaImpl.execute(DrillMetaImpl.java:1150)
>  at org.apache.calcite.avatica.AvaticaConnection.executeQueryInternal(AvaticaConnection.java:511)
>  at org.apache.calcite.avatica.AvaticaPreparedStatement.executeLargeUpdate(AvaticaPreparedStatement.java:146)
>  at org.apache.drill.jdbc.impl.DrillPreparedStatementImpl.executeLargeUpdate(DrillPreparedStatementImpl.java:512)
>  at org.apache.calcite.avatica.AvaticaPreparedStatement.executeUpdate(AvaticaPreparedStatement.java:142)
>  at RunQuery.executeQuery(RunQuery.java:61)
>  at RunQuery.run(RunQuery.java:30)
>  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  at java.lang.Thread.run(Thread.java:748)
> {noformat}



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