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https://issues.apache.org/jira/browse/HIVE-23532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17114061#comment-17114061
]
Stamatis Zampetakis commented on HIVE-23532:
--------------------------------------------
The HIVE-23532.01.patch contains only a minimal reproducer.
Apart from tests the scenario should not appear very often so I am putting this
to low priority.
> NPE when fetching incomplete column statistics from the metastore
> -----------------------------------------------------------------
>
> Key: HIVE-23532
> URL: https://issues.apache.org/jira/browse/HIVE-23532
> Project: Hive
> Issue Type: Bug
> Reporter: Stamatis Zampetakis
> Priority: Minor
> Attachments: HIVE-23532.01.patch
>
>
> Certain operations may store in the metastore incomplete column statistics.
> Fetching those statistics back from the metastore leads to
> {{NullPointerException}} .
> For instance consider a column "name" of type string. If we do have
> statistics for this column then the following info must be available:
> * maxColLen;
> * avgColLen;
> * numNulls;
> * numDVs;
> Executing the following statement on a table with no stats updates a subset
> of the statistics for this column:
> {code:sql}
> ALTER TABLE example UPDATE STATISTICS for column name SET ('numDVs'='242',
> 'numNulls'='5');
> {code}
> Fetching this kind of statistics leads to NPE that sometimes pops up in the
> client and some other times is buried in the logs leading to incomplete
> column stats during optimization and execution of a query.
> Usually the stacktrace is similar to the one below:
> {noformat}
> org.apache.hadoop.hive.ql.metadata.HiveException:
> java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.metadata.Hive.getTableColumnStatistics(Hive.java:5251)
> at
> org.apache.hadoop.hive.ql.ddl.table.info.desc.DescTableOperation.getColumnDataColPathSpecified(DescTableOperation.java:216)
> at
> org.apache.hadoop.hive.ql.ddl.table.info.desc.DescTableOperation.execute(DescTableOperation.java:94)
> at org.apache.hadoop.hive.ql.ddl.DDLTask.execute(DDLTask.java:80)
> at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:213)
> at
> org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:105)
> at org.apache.hadoop.hive.ql.Executor.launchTask(Executor.java:362)
> at org.apache.hadoop.hive.ql.Executor.launchTasks(Executor.java:335)
> at org.apache.hadoop.hive.ql.Executor.runTasks(Executor.java:246)
> at org.apache.hadoop.hive.ql.Executor.execute(Executor.java:109)
> at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:723)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:492)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:486)
> at
> org.apache.hadoop.hive.ql.reexec.ReExecDriver.run(ReExecDriver.java:164)
> at
> org.apache.hadoop.hive.ql.reexec.ReExecDriver.run(ReExecDriver.java:230)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:256)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd1(CliDriver.java:201)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:127)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:422)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:353)
> at
> org.apache.hadoop.hive.ql.QTestUtil.executeClientInternal(QTestUtil.java:730)
> at org.apache.hadoop.hive.ql.QTestUtil.executeClient(QTestUtil.java:700)
> at
> org.apache.hadoop.hive.cli.control.CoreCliDriver.runTest(CoreCliDriver.java:170)
> at
> org.apache.hadoop.hive.cli.control.CliAdapter.runTest(CliAdapter.java:157)
> at
> org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver(TestMiniLlapLocalCliDriver.java:62)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.apache.hadoop.hive.cli.control.CliAdapter$2$1.evaluate(CliAdapter.java:135)
> at org.junit.rules.RunRules.evaluate(RunRules.java:20)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
> at org.junit.runners.Suite.runChild(Suite.java:127)
> at org.junit.runners.Suite.runChild(Suite.java:26)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
> at
> org.apache.hadoop.hive.cli.control.CliAdapter$1$1.evaluate(CliAdapter.java:95)
> at org.junit.rules.RunRules.evaluate(RunRules.java:20)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
> at
> org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:379)
> at
> org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:340)
> at
> org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:125)
> at
> org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:413)
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.invoke(RetryingMetaStoreClient.java:236)
> at com.sun.proxy.$Proxy62.getTableColumnStatistics(Unknown Source)
> at
> org.apache.hadoop.hive.ql.metadata.Hive.getTableColumnStatistics(Hive.java:5246)
> ... 61 more
> {noformat}
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