[
https://issues.apache.org/jira/browse/DRILL-6816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16690157#comment-16690157
]
Khurram Faraaz commented on DRILL-6816:
---------------------------------------
[~vitalii] I haven't tried with executeQuery method yet, I will run the test
using executeQuery and share results here.
> 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
> 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}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
