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https://issues.apache.org/jira/browse/IMPALA-13018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17845903#comment-17845903
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ASF subversion and git services commented on IMPALA-13018:
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Commit 01401a0368cb8f19c86dc3fab764ee4b5732f2f6 in impala's branch
refs/heads/branch-4.4.0 from wzhou-code
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=01401a036 ]
IMPALA-12910: Support running TPCH/TPCDS queries for JDBC tables
This patch adds script to create external JDBC tables for the dataset of
TPCH and TPCDS, and adds unit-tests to run TPCH and TPCDS queries for
external JDBC tables with Impala-Impala federation. Note that JDBC
tables are mapping tables, they don't take additional disk spaces.
It fixes the race condition when caching of SQL DataSource objects by
using a new DataSourceObjectCache class, which checks reference count
before closing SQL DataSource.
Adds a new query-option 'clean_dbcp_ds_cache' with default value as
true. When it's set as false, SQL DataSource object will not be closed
when its reference count equals 0 and will be kept in cache until
the SQL DataSource is idle for more than 5 minutes. Flag variable
'dbcp_data_source_idle_timeout_s' is added to make the duration
configurable.
java.sql.Connection.close() fails to remove a closed connection from
connection pool sometimes, which causes JDBC working threads to wait
for available connections from the connection pool for a long time.
The work around is to call BasicDataSource.invalidateConnection() API
to close a connection.
Two flag variables are added for DBCP configuration properties
'maxTotal' and 'maxWaitMillis'. Note that 'maxActive' and 'maxWait'
properties are renamed to 'maxTotal' and 'maxWaitMillis' respectively
in apache.commons.dbcp v2.
Fixes a bug for database type comparison since the type strings
specified by user could be lower case or mix of upper/lower cases, but
the code compares the types with upper case string.
Fixes issue to close SQL DataSource object in JdbcDataSource.open()
and JdbcDataSource.getNext() when some errors returned from DBCP APIs
or JDBC drivers.
testdata/bin/create-tpc-jdbc-tables.py supports to create JDBC tables
for Impala-Impala, Postgres and MySQL.
Following sample commands creates TPCDS JDBC tables for Impala-Impala
federation with remote coordinator running at 10.19.10.86, and Postgres
server running at 10.19.10.86:
${IMPALA_HOME}/testdata/bin/create-tpc-jdbc-tables.py \
--jdbc_db_name=tpcds_jdbc --workload=tpcds \
--database_type=IMPALA --database_host=10.19.10.86 --clean
${IMPALA_HOME}/testdata/bin/create-tpc-jdbc-tables.py \
--jdbc_db_name=tpcds_jdbc --workload=tpcds \
--database_type=POSTGRES --database_host=10.19.10.86 \
--database_name=tpcds --clean
TPCDS tests for JDBC tables run only for release/exhaustive builds.
TPCH tests for JDBC tables run for core and exhaustive builds, except
Dockerized builds.
Remaining Issues:
- tpcds-decimal_v2-q80a failed with returned rows not matching expected
results for some decimal values. This will be fixed in IMPALA-13018.
Testing:
- Passed core tests.
- Passed query_test/test_tpcds_queries.py in release/exhaustive build.
- Manually verified that only one SQL DataSource object was created for
test_tpcds_queries.py::TestTpcdsQueryForJdbcTables since query option
'clean_dbcp_ds_cache' was set as false, and the SQL DataSource object
was closed by cleanup thread.
Change-Id: I44e8c1bb020e90559c7f22483a7ab7a151b8f48a
Reviewed-on: http://gerrit.cloudera.org:8080/21304
Reviewed-by: Abhishek Rawat
Tested-by: Impala Public Jenkins
(cherry picked from commit 08f8a300250df7b4f9a517cdb6bab48c379b7e03)
> Fix
> test_tpcds_queries.py/TestTpcdsQueryForJdbcTables.test_tpcds-decimal_v2-q80a
> failure
>
>
> Key: IMPALA-13018
> URL: https://issues.apache.org/jira/browse/IMPALA-13018
> Project: IMPALA
> Issue Type: Sub-task
> Components: Backend, Frontend
>Reporter: Wenzhe Zhou
>Assignee: Wenzhe Zhou
>Priority: Major
> Fix For: Impala 4.5.0
>
>
> The returned rows are not matching expected results for some decimal type of
> columns.
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