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Posted to issues@hive.apache.org by "Karen Coppage (Jira)" <ji...@apache.org> on 2019/10/28 15:24:00 UTC
[jira] [Assigned] (HIVE-22416) MR-related operation logs missing
when parallel execution is enabled
[ https://issues.apache.org/jira/browse/HIVE-22416?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Karen Coppage reassigned HIVE-22416:
------------------------------------
> MR-related operation logs missing when parallel execution is enabled
> ---------------------------------------------------------------------
>
> Key: HIVE-22416
> URL: https://issues.apache.org/jira/browse/HIVE-22416
> Project: Hive
> Issue Type: Bug
> Reporter: Karen Coppage
> Assignee: Karen Coppage
> Priority: Major
>
> Repro steps:
> 1. Happy path, parallel execution disabled
> {code:java}
> 0: jdbc:hive2://localhost:10000> set hive.exec.parallel=false;
> No rows affected (0.023 seconds)
> 0: jdbc:hive2://localhost:10000> select count (*) from t1;
> INFO : Compiling command(queryId=karencoppage_20191028152610_a26c25e1-9834-446a-9a56-c676cb693e7d): select count (*) from t1
> INFO : Semantic Analysis Completed
> INFO : Returning Hive schema: Schema(fieldSchemas:[FieldSchema(name:c0, type:bigint, comment:null)], properties:null)
> INFO : Completed compiling command(queryId=karencoppage_20191028152610_a26c25e1-9834-446a-9a56-c676cb693e7d); Time taken: 0.309 seconds
> INFO : Executing command(queryId=karencoppage_20191028152610_a26c25e1-9834-446a-9a56-c676cb693e7d): select count (*) from t1
> WARN :
> INFO : Query ID = karencoppage_20191028152610_a26c25e1-9834-446a-9a56-c676cb693e7d
> INFO : Total jobs = 1
> INFO : Launching Job 1 out of 1
> INFO : Starting task [Stage-1:MAPRED] in serial mode
> INFO : Number of reduce tasks determined at compile time: 1
> INFO : In order to change the average load for a reducer (in bytes):
> INFO : set hive.exec.reducers.bytes.per.reducer=<number>
> INFO : In order to limit the maximum number of reducers:
> INFO : set hive.exec.reducers.max=<number>
> INFO : In order to set a constant number of reducers:
> INFO : set mapreduce.job.reduces=<number>
> DEBUG : Configuring job job_local495362389_0008 with file:/tmp/hadoop/mapred/staging/karencoppage495362389/.staging/job_local495362389_0008 as the submit dir
> DEBUG : adding the following namenodes' delegation tokens:[file:///]
> DEBUG : Creating splits at file:/tmp/hadoop/mapred/staging/karencoppage495362389/.staging/job_local495362389_0008
> INFO : number of splits:0
> INFO : Submitting tokens for job: job_local495362389_0008
> INFO : Executing with tokens: []
> INFO : The url to track the job: http://localhost:8080/
> INFO : Job running in-process (local Hadoop)
> INFO : 2019-10-28 15:26:22,537 Stage-1 map = 0%, reduce = 100%
> INFO : Ended Job = job_local495362389_0008
> INFO : MapReduce Jobs Launched:
> INFO : Stage-Stage-1: HDFS Read: 0 HDFS Write: 0 SUCCESS
> INFO : Total MapReduce CPU Time Spent: 0 msec
> INFO : Completed executing command(queryId=karencoppage_20191028152610_a26c25e1-9834-446a-9a56-c676cb693e7d); Time taken: 6.497 seconds
> INFO : OK
> DEBUG : Shutting down query select count (*) from t1
> +-----+
> | c0 |
> +-----+
> | 0 |
> +-----+
> 1 row selected (11.874 seconds)
> {code}
> 2. Faulty path, parallel execution enabled
> {code:java}
> 0: jdbc:hive2://localhost:10000> set hive.server2.logging.operation.level=EXECUTION;
> No rows affected (0.236 seconds)
> 0: jdbc:hive2://localhost:10000> set hive.exec.parallel=true;
> No rows affected (0.01 seconds)
> 0: jdbc:hive2://localhost:10000> select count (*) from t1;
> INFO : Compiling command(queryId=karencoppage_20191028155346_4e7b793b-654e-4d69-b588-f3f0d3ae0c77): select count (*) from t1
> INFO : Semantic Analysis Completed
> INFO : Returning Hive schema: Schema(fieldSchemas:[FieldSchema(name:c0, type:bigint, comment:null)], properties:null)
> INFO : Completed compiling command(queryId=karencoppage_20191028155346_4e7b793b-654e-4d69-b588-f3f0d3ae0c77); Time taken: 4.707 seconds
> INFO : Executing command(queryId=karencoppage_20191028155346_4e7b793b-654e-4d69-b588-f3f0d3ae0c77): select count (*) from t1
> WARN :
> INFO : Query ID = karencoppage_20191028155346_4e7b793b-654e-4d69-b588-f3f0d3ae0c77
> INFO : Total jobs = 1
> INFO : Launching Job 1 out of 1
> INFO : Starting task [Stage-1:MAPRED] in parallel
> INFO : MapReduce Jobs Launched:
> INFO : Stage-Stage-1: HDFS Read: 0 HDFS Write: 0 SUCCESS
> INFO : Total MapReduce CPU Time Spent: 0 msec
> INFO : Completed executing command(queryId=karencoppage_20191028155346_4e7b793b-654e-4d69-b588-f3f0d3ae0c77); Time taken: 44.577 seconds
> INFO : OK
> DEBUG : Shutting down query select count (*) from t1
> +-----+
> | c0 |
> +-----+
> | 0 |
> +-----+
> 1 row selected (54.665 seconds)
> {code}
> The issue is that Log4J stores the session ID and query ID in some atomic thread metadata (org.apache.logging.log4j.ThreadContext.getImmutableContext()). If the queryId is missing from this metadata, then the RoutingAppender (which is defined programmatically in LogDivertAppender) will route the log to a NullAppender, which logs nothing. If the queryId is present, then the RoutingAppender routes the event to the "query-appender" logger, which will log the line in the operation log/Beeline. This is not happening in a multi-threaded context since new threads created for parallel query execution do not have the queryId/sessionId metadata.
> The solution is to add the queryId/sessionId metadata to any new threads created for MR work.
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