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Date: Wed, 25 Jan 2012 00:30:45 +0000 (UTC)
From: "Thomas Weise (Commented) (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Commented] (HIVE-2609) NPE when pruning partitions by
 thrift method get_partitions_by_filter
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    [ https://issues.apache.org/jira/browse/HIVE-2609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192699#comment-13192699 ] 

Thomas Weise commented on HIVE-2609:
------------------------------------

We replace them after the build.

                
> NPE when pruning partitions by thrift method get_partitions_by_filter
> ---------------------------------------------------------------------
>
>                 Key: HIVE-2609
>                 URL: https://issues.apache.org/jira/browse/HIVE-2609
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>    Affects Versions: 0.7.1
>            Reporter: Min Zhou
>
> It's a datanucleus bug indeed. 
> try this code:
> {code}
> boolean open = false;
> for (int i = 0; i < 5 && !open; ++i) {
>   try {
>     transport.open();
>     open = true;
>   } catch (TTransportException e) {
>     System.out.println("failed to connect to MetaStore, re-trying...");
>     try {
>       Thread.sleep(1000);
>     } catch (InterruptedException ignore) {}
>   }
> }
> try {
>   List<Partition> parts =
>       client.get_partitions_by_filter("default", "partitioned_nation",
>           "pt < '2'", (short) -1);
>   for (Partition part : parts) {
>     System.out.println(part.getSd().getLocation());
>   }
> } catch (Exception te) {
>   te.printStackTrace();
> }
> {code}
> A NPEexception would be thrown on the thrift server side
> {noformat}
> 11/11/25 13:11:55 ERROR api.ThriftHiveMetastore$Processor: Internal error processing get_partitions_by_filter
> java.lang.NullPointerException
>         at org.datanucleus.store.mapped.mapping.MappingHelper.getMappingIndices(MappingHelper.java:35)
>         at org.datanucleus.store.mapped.expression.StatementText.applyParametersToStatement(StatementText.java:194)
>         at org.datanucleus.store.rdbms.query.RDBMSQueryUtils.getPreparedStatementForQuery(RDBMSQueryUtils.java:233)
>         at org.datanucleus.store.rdbms.query.legacy.SQLEvaluator.evaluate(SQLEvaluator.java:115)
>         at org.datanucleus.store.rdbms.query.legacy.JDOQLQuery.performExecute(JDOQLQuery.java:288)
>         at org.datanucleus.store.query.Query.executeQuery(Query.java:1657)
>         at org.datanucleus.store.rdbms.query.legacy.JDOQLQuery.executeQuery(JDOQLQuery.java:245)
>         at org.datanucleus.store.query.Query.executeWithMap(Query.java:1526)
>         at org.datanucleus.jdo.JDOQuery.executeWithMap(JDOQuery.java:334)
>         at org.apache.hadoop.hive.metastore.ObjectStore.listMPartitionsByFilter(ObjectStore.java:1329)
>         at org.apache.hadoop.hive.metastore.ObjectStore.getPartitionsByFilter(ObjectStore.java:1241)
>         at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler$40.run(HiveMetaStore.java:2369)
>         at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler$40.run(HiveMetaStore.java:2366)
>         at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.executeWithRetry(HiveMetaStore.java:307)
>         at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.get_partitions_by_filter(HiveMetaStore.java:2366)
>         at org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Processor$get_partitions_by_filter.process(ThriftHiveMetastore.j
> ava:6099)
>         at org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Processor.process(ThriftHiveMetastore.java:4789)
>         at org.apache.hadoop.hive.metastore.HiveMetaStore$TLoggingProcessor.process(HiveMetaStore.java:3167)
>         at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:253)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:662)
> {noformat}
> A null JavaTypeMapping was passed into org.datanucleus.store.mapped.mapping.MappingHelper.(int initialPosition, JavaTypeMapping mapping), that caused NPE.
> After digged into the datanucleus source, I found that the null value was born in the constructor of org.datanucleus.store.mapped.expression.SubstringExpression. see
> {code}
>     /**
>      * Constructs the substring
>      * @param str the String Expression
>      * @param begin The start position
>      * @param end The end position expression
>      **/   
>     public SubstringExpression(StringExpression str, NumericExpression begin, NumericExpression end)
>     {
>         super(str.getQueryExpression());
>         st.append("SUBSTRING(").append(str).append(" FROM ")
>             .append(begin.add(new IntegerLiteral(qs, mapping, BigInteger.ONE)))
>             .append(" FOR ").append(end.sub(begin)).append(')');
>     }
> {code}
> The field mapping hasn't been instanced at that moment.
> How do you deal with such a external bug?

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