[ 
https://issues.apache.org/jira/browse/HIVE-14303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15395025#comment-15395025
 ] 

Hive QA commented on HIVE-14303:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12820048/HIVE-14303.0.patch

{color:red}ERROR:{color} -1 due to no test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 188 failed/errored test(s), 10368 tests 
executed
*Failed tests:*
{noformat}
TestMsgBusConnection - did not produce a TEST-*.xml file
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_auto_smb_mapjoin_14
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_auto_sortmerge_join_13
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_auto_sortmerge_join_6
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_auto_sortmerge_join_9
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketcontext_1
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketcontext_2
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketcontext_3
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketcontext_4
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketcontext_5
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketcontext_6
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketcontext_7
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketcontext_8
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketizedhiveinputformat_auto
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketsortoptimize_insert_2
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketsortoptimize_insert_6
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketsortoptimize_insert_7
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_bucketsortoptimize_insert_8
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_cbo_rp_auto_join1
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_join_filters
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_join_nulls
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_join_nullsafe
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_list_bucket_dml_12
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_parquet_join
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_join_partition_key
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_1
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_11
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_12
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_14
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_16
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_17
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_2
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_3
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_4
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_5
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_6
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_smb_mapjoin_7
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_sort_merge_join_desc_1
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_sort_merge_join_desc_2
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_sort_merge_join_desc_3
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_sort_merge_join_desc_5
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_sort_merge_join_desc_8
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_stats_list_bucket
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_subquery_multiinsert
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_vector_auto_smb_mapjoin_14
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_vectorized_bucketmapjoin1
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_cte_5
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_cte_mat_4
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_cte_mat_5
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_dynamic_partition_pruning
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_hybridgrace_hashjoin_1
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_mrr
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_orc_llap
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_tez_dynpart_hashjoin_1
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_tez_join_hash
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_tez_join_tests
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_tez_joins_explain
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_tez_self_join
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_tez_smb_main
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_tez_union
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_tez_vector_dynpart_hashjoin_1
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_vector_join_part_col_char
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver_vectorized_dynamic_partition_pruning
org.apache.hadoop.hive.cli.TestMiniSparkOnYarnCliDriver.testCliDriver_auto_sortmerge_join_16
org.apache.hadoop.hive.cli.TestMiniSparkOnYarnCliDriver.testCliDriver_bucketmapjoin6
org.apache.hadoop.hive.cli.TestMiniSparkOnYarnCliDriver.testCliDriver_infer_bucket_sort_map_operators
org.apache.hadoop.hive.cli.TestMiniSparkOnYarnCliDriver.testCliDriver_quotedid_smb
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_join1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_join21
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_join29
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_join30
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_join_filters
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_join_nulls
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_10
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_11
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_12
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_13
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_14
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_16
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_2
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_3
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_4
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_5
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_6
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_7
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_8
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_auto_sortmerge_join_9
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_bucket_map_join_tez1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_gby
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_join
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_limit
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_semijoin
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_simple_select
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_subq_exists
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_subq_in
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_subq_not_in
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_union
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cbo_views
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_constprog_semijoin
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_correlationoptimizer1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cte_5
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cte_mat_4
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_cte_mat_5
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_dynamic_partition_pruning
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_dynamic_partition_pruning_2
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_explainuser_1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_explainuser_2
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_explainuser_4
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_filter_join_breaktask
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_filter_join_breaktask2
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_hybridgrace_hashjoin_1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_hybridgrace_hashjoin_2
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_join0
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_join1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_join_nullsafe
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_leftsemijoin
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_lvj_mapjoin
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_mapjoin2
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_mapjoin_mapjoin
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_mergejoin
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_mrr
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_ptf
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_ptf_streaming
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_selectDistinctStar
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_skewjoin
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_subquery_exists
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_subquery_in
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_bmj_schema_evolution
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_dynpart_hashjoin_1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_join_hash
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_join_tests
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_joins_explain
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_self_join
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_smb_empty
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_smb_main
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_union
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_vector_dynpart_hashjoin_1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_unionDistinct_1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_auto_smb_mapjoin_14
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_decimal_3
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_join30
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_join_filters
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_join_nulls
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_join_part_col_char
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_left_outer_join2
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_leftsemi_mapjoin
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_mapjoin_reduce
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_nullsafe_join
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vector_outer_join5
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vectorization_part
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vectorization_part_varchar
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vectorized_bucketmapjoin1
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vectorized_dynamic_partition_pruning
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vectorized_ptf
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vectorized_shufflejoin
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_auto_sortmerge_join_16
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_bucketmapjoin6
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_infer_bucket_sort_map_operators
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_quotedid_smb
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_auto_smb_mapjoin_14
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_auto_sortmerge_join_13
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_auto_sortmerge_join_16
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_auto_sortmerge_join_6
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_auto_sortmerge_join_9
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_join_nullsafe
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_parquet_join
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_1
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_11
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_12
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_14
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_16
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_17
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_2
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_3
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_4
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_5
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_6
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_7
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_smb_mapjoin_8
org.apache.hadoop.hive.metastore.TestMetaStoreMetrics.testConnections
org.apache.hive.minikdc.TestJdbcWithDBTokenStore.testConnection
org.apache.hive.minikdc.TestJdbcWithDBTokenStore.testIsValid
org.apache.hive.minikdc.TestJdbcWithDBTokenStore.testIsValidNeg
org.apache.hive.minikdc.TestJdbcWithDBTokenStore.testNegativeProxyAuth
org.apache.hive.minikdc.TestJdbcWithDBTokenStore.testNegativeTokenAuth
org.apache.hive.minikdc.TestJdbcWithDBTokenStore.testProxyAuth
org.apache.hive.minikdc.TestJdbcWithDBTokenStore.testTokenAuth
{noformat}

Test results: 
https://builds.apache.org/job/PreCommit-HIVE-MASTER-Build/655/testReport
Console output: 
https://builds.apache.org/job/PreCommit-HIVE-MASTER-Build/655/console
Test logs: 
http://ec2-204-236-174-241.us-west-1.compute.amazonaws.com/logs/PreCommit-HIVE-MASTER-Build-655/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 188 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12820048 - PreCommit-HIVE-MASTER-Build

> CommonJoinOperator.checkAndGenObject should return directly at CLOSE state to 
> avoid NPE if ExecReducer.close is called twice.
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-14303
>                 URL: https://issues.apache.org/jira/browse/HIVE-14303
>             Project: Hive
>          Issue Type: Bug
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>             Fix For: 2.1.0
>
>         Attachments: HIVE-14303.0.patch
>
>
> CommonJoinOperator.checkAndGenObject should return directly at CLOSE state to 
> avoid NPE if ExecReducer.close is called twice. ExecReducer.close implements 
> Closeable interface and ExecReducer.close can be called multiple time. We saw 
> the following NPE which hide the real exception due to this bug.
> {code}
> Error: java.lang.RuntimeException: Hive Runtime Error while closing 
> operators: null
>         at 
> org.apache.hadoop.hive.ql.exec.mr.ExecReducer.close(ExecReducer.java:296)
>         at org.apache.hadoop.io.IOUtils.cleanup(IOUtils.java:244)
>         at 
> org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:459)
>         at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:392)
>         at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:415)
>         at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1671)
>         at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
> Caused by: java.lang.NullPointerException
>         at 
> org.apache.hadoop.hive.ql.exec.CommonJoinOperator.checkAndGenObject(CommonJoinOperator.java:718)
>         at 
> org.apache.hadoop.hive.ql.exec.JoinOperator.endGroup(JoinOperator.java:256)
>         at 
> org.apache.hadoop.hive.ql.exec.mr.ExecReducer.close(ExecReducer.java:284)
>         ... 8 more
> {code}
> The code from ReduceTask.runOldReducer:
> {code}
>       reducer.close(); //line 453
>       reducer = null;
>       
>       out.close(reporter);
>       out = null;
>     } finally {
>       IOUtils.cleanup(LOG, reducer);// line 459
>       closeQuietly(out, reporter);
>     }
> {code}
> Based on the above stack trace and code, reducer.close() is called twice 
> because the exception happened when reducer.close() is called for the first 
> time at line 453, the code exit before reducer was set to null. 
> NullPointerException is triggered when reducer.close() is called for the 
> second time in IOUtils.cleanup at line 459. NullPointerException hide the 
> real exception which happened when reducer.close() is called for the first 
> time at line 453.
> The reason for NPE is:
> The first reducer.close called CommonJoinOperator.closeOp which clear 
> {{storage}}
> {code}
> Arrays.fill(storage, null);
> {code}
> the second reduce.close generated NPE due to null {{storage[alias]}} which is 
> set to null by first reducer.close.
> The following reducer log can give more proof:
> {code}
> 2016-07-14 22:24:51,016 INFO [main] 
> org.apache.hadoop.hive.ql.exec.JoinOperator: 0 finished. closing... 
> 2016-07-14 22:24:51,016 INFO [main] 
> org.apache.hadoop.hive.ql.exec.JoinOperator: 0 finished. closing... 
> 2016-07-14 22:24:51,016 INFO [main] 
> org.apache.hadoop.hive.ql.exec.JoinOperator: SKEWJOINFOLLOWUPJOBS:0
> 2016-07-14 22:24:51,016 INFO [main] 
> org.apache.hadoop.hive.ql.exec.SelectOperator: 1 finished. closing... 
> 2016-07-14 22:24:51,016 INFO [main] 
> org.apache.hadoop.hive.ql.exec.SelectOperator: 2 finished. closing... 
> 2016-07-14 22:24:51,016 INFO [main] 
> org.apache.hadoop.hive.ql.exec.SelectOperator: 3 finished. closing... 
> 2016-07-14 22:24:51,016 INFO [main] 
> org.apache.hadoop.hive.ql.exec.FileSinkOperator: 4 finished. closing... 
> 2016-07-14 22:24:51,016 INFO [main] 
> org.apache.hadoop.hive.ql.exec.FileSinkOperator: FS[4]: records written - 
> 53466
> 2016-07-14 22:25:11,555 ERROR [main] ExecReducer: Hit error while closing 
> operators - failing tree
> 2016-07-14 22:25:11,649 WARN [main] org.apache.hadoop.mapred.YarnChild: 
> Exception running child : java.lang.RuntimeException: Hive Runtime Error 
> while closing operators: null
>       at 
> org.apache.hadoop.hive.ql.exec.mr.ExecReducer.close(ExecReducer.java:296)
>       at org.apache.hadoop.io.IOUtils.cleanup(IOUtils.java:244)
>       at 
> org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:459)
>       at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:392)
>       at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:415)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1671)
>       at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hadoop.hive.ql.exec.CommonJoinOperator.checkAndGenObject(CommonJoinOperator.java:718)
>       at 
> org.apache.hadoop.hive.ql.exec.JoinOperator.endGroup(JoinOperator.java:256)
>       at 
> org.apache.hadoop.hive.ql.exec.mr.ExecReducer.close(ExecReducer.java:284)
>       ... 8 more
> {code}



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