Wenzhe Zhou has uploaded a new patch set (#29) to the change originally created
by Fucun Chu. ( http://gerrit.cloudera.org:8080/17842 )
Change subject: IMPALA-5741: Initial support for reading tiny RDBMS tables
......................................................................
IMPALA-5741: Initial support for reading tiny RDBMS tables
This patch uses the "external data source" mechanism in Impala to
implement data source for querying jdbc.
It has some limitations due to the restrictions of "external data
source":
- It is not distributed, e.g, fregment is unpartitioned. The queries
are executed on coordinator.
- Queries which read following data types from external jdbc tables
are not supported:
BINARY, CHAR, DATETIME, and COMPLEX.
- Only support binary predicates with operators =, !=, <=, >=,
<, > to be pushed to RDBMS.
- Don't support following data types for predicates:
DECIMAL, TIMESTAMP, DATE, and BINARY.
- Don't support external tables with complex types of columns.
- Only support following RDBMS:
MySQL, Postgres, Oracle, MSSQL, H2, DB2, and JETHRO_DATA.
- Don't support Catalog V2 (IMPALA-7131)
- DataSource objects are not persistent (IMPALA-12375)
Additional fixes are planned on top of this patch.
Source files under jdbc/conf, jdbc/dao and jdbc/exception are
replicated from Hive JDBC Storage Handler.
In order to query the RDBMS tables, the following steps should be
followed (note that existing data source table will be rebuilt):
1. Make sure the Impala cluster has been started.
2. Copy the jar files of jdbc drivers and the data source library into
HDFS.
${IMPALA_HOME}/testdata/bin/copy-ext-data-sources.sh
3. Create an `alltypes` table in the postgres database.
${IMPALA_HOME}/testdata/bin/load-ext-data-sources.sh
4. Create data source tables (alltypes_jdbc_datasource and
alltypes_jdbc_datasource_2).
${IMPALA_HOME}/bin/impala-shell.sh -f\
${IMPALA_HOME}/testdata/bin/create-ext-data-source-table.sql
5. It's ready to run query to access data source tables created
in last step. Don't need to restart Impala cluster.
Testing:
- Added unit-test for Postgres and ran unit-test with jdbc driver
postgresql-42.5.1.jar.
- Ran manual unit-test for MySql with jdbc driver
mysql-connector-j-8.1.0.jar.
- Ran core tests successfully.
Change-Id: I8244e978c7717c6f1452f66f1630b6441392e7d2
---
M bin/rat_exclude_files.txt
M
fe/src/main/java/org/apache/impala/extdatasource/ExternalDataSourceExecutor.java
M fe/src/test/java/org/apache/impala/service/FrontendTest.java
A java/ext-data-source/jdbc/pom.xml
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/JdbcDataSource.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/README.md
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/conf/DatabaseType.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/conf/JdbcStorageConfig.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/conf/JdbcStorageConfigManager.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/DB2DatabaseAccessor.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/DatabaseAccessor.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/DatabaseAccessorFactory.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/GenericJdbcDatabaseAccessor.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/JdbcRecordIterator.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/JethroDatabaseAccessor.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/MsSqlDatabaseAccessor.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/MySqlDatabaseAccessor.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/OracleDatabaseAccessor.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/dao/PostgresDatabaseAccessor.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/exception/JdbcDatabaseAccessException.java
A
java/ext-data-source/jdbc/src/main/java/org/apache/impala/extdatasource/jdbc/util/QueryConditionUtil.java
A
java/ext-data-source/jdbc/src/test/java/org/apache/impala/extdatasource/jdbc/JdbcDataSourceTest.java
A java/ext-data-source/jdbc/src/test/resources/log4j.properties
A java/ext-data-source/jdbc/src/test/resources/test_script.sql
M java/ext-data-source/pom.xml
D testdata/bin/copy-data-sources.sh
A testdata/bin/copy-ext-data-sources.sh
D testdata/bin/create-data-source-table.sql
A testdata/bin/create-ext-data-source-table.sql
M testdata/bin/create-load-data.sh
A testdata/bin/load-ext-data-sources.sh
A testdata/workloads/functional-query/queries/QueryTest/jdbc-data-source.test
A tests/query_test/test_ext_data_sources.py
M tests/query_test/test_queries.py
34 files changed, 2,488 insertions(+), 86 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/42/17842/29
--
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I8244e978c7717c6f1452f66f1630b6441392e7d2
Gerrit-Change-Number: 17842
Gerrit-PatchSet: 29
Gerrit-Owner: Fucun Chu <chufu...@hotmail.com>
Gerrit-Reviewer: Abhishek Rawat <ara...@cloudera.com>
Gerrit-Reviewer: Anonymous Coward <gsi...@cloudera.com>
Gerrit-Reviewer: Csaba Ringhofer <csringho...@cloudera.com>
Gerrit-Reviewer: Fucun Chu <chufu...@hotmail.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Kurt Deschler <kdesc...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <huangquanl...@gmail.com>
Gerrit-Reviewer: Riza Suminto <riza.sumi...@cloudera.com>
Gerrit-Reviewer: Wenzhe Zhou <wz...@cloudera.com>
