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Posted to dev@atlas.apache.org by "Ayub Khan (JIRA)" <ji...@apache.org> on 2016/04/04 12:39:25 UTC
[jira] [Created] (ATLAS-626) Hive temporary table metadata is
captured in atlas.
Ayub Khan created ATLAS-626:
-------------------------------
Summary: Hive temporary table metadata is captured in atlas.
Key: ATLAS-626
URL: https://issues.apache.org/jira/browse/ATLAS-626
Project: Atlas
Issue Type: Bug
Affects Versions: trunk
Reporter: Ayub Khan
Fix For: trunk
As part of HIVE-7090, hive supports session level temporary tables and life cycle of them.
These temporary tables are used to run some additional queries against it and cleaned up at the end of the session.
Inserting data in to table creates this temporary table, whose metadata is synced to atlas and once the session expires, the table is cleaned up in hive but the table still exists in atlas.
1. What is the use-case of storing metadata of this temporary table? Are temporary tables important?
2. Impact: Metadata objects might grow if the the probability of insert operation is high in production.
3. Insert queries fired from across databases are shown in lineage. i.e; Temporary table is shown in lineage only when it is created in different database than the target database. is this expected?
Lineage snapshot link: https://monosnap.com/file/DtnPZA85Ug0Q27arTOqY1FnhbDQdXU
{noformat}
0: jdbc:hive2://localhost:10000/default> show tables;
+-----------+--+
| tab_name |
+-----------+--+
| abc12312 |
| h3 |
| h5 |
+-----------+--+
3 rows selected (0.231 seconds)
0: jdbc:hive2://localhost:10000/default> insert into table default.h5 values ( "efg1", "abc1", 1231, 123121);
INFO : Number of reduce tasks is set to 0 since there's no reduce operator
INFO : number of splits:1
INFO : Submitting tokens for job: job_local737234864_0006
INFO : The url to track the job: http://localhost:8080/
INFO : Job running in-process (local Hadoop)
INFO : 2016-04-04 15:21:20,381 Stage-1 map = 100%, reduce = 0%
INFO : Ended Job = job_local737234864_0006
INFO : Stage-4 is selected by condition resolver.
INFO : Stage-3 is filtered out by condition resolver.
INFO : Stage-5 is filtered out by condition resolver.
INFO : Moving data to: hdfs://localhost:9000/user/hive/warehouse/h5/.hive-staging_hive_2016-04-04_15-21-17_057_941878903735098303-9/-ext-10000 from hdfs://localhost:9000/user/hive/warehouse/h5/.hive-staging_hive_2016-04-04_15-21-17_057_941878903735098303-9/-ext-10002
INFO : Loading data to table default.h5 from hdfs://localhost:9000/user/hive/warehouse/h5/.hive-staging_hive_2016-04-04_15-21-17_057_941878903735098303-9/-ext-10000
INFO : Table default.h5 stats: [numFiles=5, numRows=5, totalSize=106, rawDataSize=101]
No rows affected (3.72 seconds)
0: jdbc:hive2://localhost:10000/default> show tables;
+------------------------+--+
| tab_name |
+------------------------+--+
| abc12312 |
| h3 |
| h5 |
| values__tmp__table__1 |
+------------------------+--+
4 rows selected (0.196 seconds)
0: jdbc:hive2://localhost:10000/default> describe extended values__tmp__table__1;
+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+--+
| col_name | data_type | comment |
+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+--+
| tmp_values_col1 | string | |
| tmp_values_col2 | string | |
| tmp_values_col3 | string | |
| tmp_values_col4 | string | |
| | NULL | NULL |
| Detailed Table Information | Table(tableName:values__tmp__table__1, dbName:default, owner:apathan, createTime:1459763477, lastAccessTime:0, retention:0, sd:StorageDescriptor(cols:[FieldSchema(name:tmp_values_col1, type:string, comment:), FieldSchema(name:tmp_values_col2, type:string, comment:), FieldSchema(name:tmp_values_col3, type:string, comment:), FieldSchema(name:tmp_values_col4, type:string, comment:)], location:hdfs://localhost:9000/tmp/hive/apathan/d461c5c3-931a-4aa3-9124-997b75f10c11/_tmp_space.db/Values__Tmp__Table__1, inputFormat:org.apache.hadoop.mapred.TextInputFormat, outputFormat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat, compressed:false, numBuckets:-1, serdeInfo:SerDeInfo(name:null, serializationLib:org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, parameters:{serialization.format=1}), bucketCols:[], sortCols:[], parameters:{}, skewedInfo:SkewedInfo(skewedColNames:[], skewedColValues:[], skewedColValueLocationMaps:{}), storedAsSubDirectories:false), partitionKeys:[], parameters:{}, viewOriginalText:null, viewExpandedText:null, tableType:MANAGED_TABLE, privileges:PrincipalPrivilegeSet(userPrivileges:{}, groupPrivileges:null, rolePrivileges:null), temporary:true) | |
+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+--+
6 rows selected (0.174 seconds)
0: jdbc:hive2://localhost:10000/default>
{noformat}
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