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https://issues.apache.org/jira/browse/HIVE-12716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15066312#comment-15066312
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JoneZhang commented on HIVE-12716:
----------------------------------
Thanks for you reply.
We have a lot of querys to use mapjoin.
We'are going to continue to use mapjoin hint before migrates from hint mapjoin
to auto-convert mapjoin.
> Hive on Spark map-join throw NullPointerException
> -------------------------------------------------
>
> Key: HIVE-12716
> URL: https://issues.apache.org/jira/browse/HIVE-12716
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.1.1, 1.2.1
> Reporter: JoneZhang
> Assignee: Xuefu Zhang
>
> The query is
> set hive.execution.engine=spark;
> select
> t3.pcid,channel,version,ip,hour,app_id,app_name,app_apk,app_version,app_type,dwl_tool,dwl_status,err_type,dwl_store,dwl_maxspeed,dwl_minspeed,dwl_avgspeed,last_time,dwl_num,
> (case when t4.cnt is null then 0 else 1 end) as is_evil
> from
> (select /*+mapjoin(t2)*/
> pcid,channel,version,ip,hour,
> (case when t2.app_id is null then t1.app_id else t2.app_id end) as app_id,
> t2.name as app_name,
> app_apk,
> app_version,app_type,dwl_tool,dwl_status,err_type,dwl_store,dwl_maxspeed,dwl_minspeed,dwl_avgspeed,last_time,dwl_num
> from
> t_ed_soft_downloadlog_molo t1 left outer join t_rd_soft_app_pkg_name t2 on
> (lower(t1.app_apk) = lower(t2.package_id) and t1.ds = 20151217 and t2.ds =
> 20151217)
> where
> t1.ds = 20151217) t3
> left outer join
> (
> select pcid,count(1) cnt from t_ed_soft_evillog_molo where ds=20151217
> group by pcid
> ) t4
> on t3.pcid=t4.pcid;
> Create table statements are as follows
> CREATE TABLE `t_ed_soft_downloadlog_molo`(
> `pcid` string,
> `channel` string,
> `version` string,
> `ip` string,
> `hour` string,
> `app_id` bigint,
> `app_name` string,
> `app_apk` string,
> `app_version` string,
> `app_type` string,
> `dwl_tool` string,
> `dwl_status` string,
> `err_type` string,
> `dwl_store` string,
> `dwl_maxspeed` string,
> `dwl_minspeed` string,
> `dwl_avgspeed` string,
> `last_time` date,
> `dwl_num` int)
> PARTITIONED BY (
> `ds` bigint);
> CREATE TABLE `t_rd_soft_app_pkg_name`(
> `app_id` bigint,
> `cp_id` bigint,
> `cat_id` bigint,
> `package_id` string,
> `name` string)
> PARTITIONED BY (
> `ds` bigint);
> CREATE TABLE `t_ed_soft_evillog_molo`(
> `imp_date` string,
> `uin` string,
> `pcid` string,
> `appid` string,
> `domain` string,
> `action_type` string,
> `via` string)
> PARTITIONED BY (
> `ds` bigint);
> And the error log is
> 2015-12-18 08:10:18,685 INFO [main]: spark.SparkMapJoinOptimizer
> (SparkMapJoinOptimizer.java:process(79)) - Check if it can be converted to
> map join
> 2015-12-18 08:10:18,686 ERROR [main]: ql.Driver
> (SessionState.java:printError(966)) - FAILED: NullPointerException null
> java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.optimizer.spark.SparkMapJoinOptimizer.getConnectedParentMapJoinSize(SparkMapJoinOptimizer.java:312)
> at
> org.apache.hadoop.hive.ql.optimizer.spark.SparkMapJoinOptimizer.getConnectedMapJoinSize(SparkMapJoinOptimizer.java:292)
> at
> org.apache.hadoop.hive.ql.optimizer.spark.SparkMapJoinOptimizer.getMapJoinConversionInfo(SparkMapJoinOptimizer.java:271)
> at
> org.apache.hadoop.hive.ql.optimizer.spark.SparkMapJoinOptimizer.process(SparkMapJoinOptimizer.java:80)
> at
> org.apache.hadoop.hive.ql.optimizer.spark.SparkJoinOptimizer.process(SparkJoinOptimizer.java:58)
> at
> org.apache.hadoop.hive.ql.lib.DefaultRuleDispatcher.dispatch(DefaultRuleDispatcher.java:92)
> at
> org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatchAndReturn(DefaultGraphWalker.java:97)
> at
> org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatch(DefaultGraphWalker.java:81)
> at
> org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.walk(DefaultGraphWalker.java:135)
> at
> org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.startWalking(DefaultGraphWalker.java:112)
> at
> org.apache.hadoop.hive.ql.parse.spark.SparkCompiler.optimizeOperatorPlan(SparkCompiler.java:128)
> at
> org.apache.hadoop.hive.ql.parse.TaskCompiler.compile(TaskCompiler.java:102)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:10238)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:210)
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:233)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:425)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:308)
> at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1123)
> at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1171)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1060)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1050)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:208)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:160)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:447)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:357)
> at
> org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:795)
> at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:767)
> at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:704)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:212)
> Some properties on hive-site.xml is
> <property>
> <name>hive.ignore.mapjoin.hint</name>
> <value>false</value>
> </property>
> <property>
> <name>hive.auto.convert.join</name>
> <value>true</value>
> </property>
> <property>
> <name>hive.auto.convert.join.noconditionaltask</name>
> <value>true</value>
> </property>
> The error relevant code is
> long mjSize = ctx.getMjOpSizes().get(op);
> I think it should be checked whether or not ctx.getMjOpSizes().get(op) is
> null.
> Of course, more strict logic need to you to decide.
> Thanks.
> Best Wishes.
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