GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/16678
[SPARK-19209] [WIP] JDBC: Fix "No suitable driver" on the first try
### What changes were proposed in this pull request?
This PR is to revert some changes made in
https://github.com/apache/spark/pull/15292
> @darabos reported Spark 2.1.0 issued the `No suitable driver` exception
at the first time when reading a JDBC data source but simply re-executing the
same command a second time "fixes" the `No suitable driver` error. This only
happens when the Hive support is enabled.
Based on my understanding, the problem is `java.sql.DriverManager` class
that can't access drivers loaded by Spark ClassLoader. The changes made in this
PR does not sounds a solution for the reported issue. It could be caused by the
other code changes in 2.1 that change the current ClassLoader
@darabos Could you please help us try it in your local environment? Thanks!
```
$ ~/spark-2.1.0/bin/spark-shell --jars org.xerial.sqlite-jdbc-3.8.11.2.jar
--driver-class-path org.xerial.sqlite-jdbc-3.8.11.2.jar
[...]
scala> spark.read.format("jdbc").option("url",
"jdbc:sqlite:").option("dbtable", "x").load
java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getDriver(DriverManager.java:315)
at
org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions$$anonfun$7.apply(JDBCOptions.scala:84)
at
org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions$$anonfun$7.apply(JDBCOptions.scala:84)
at scala.Option.getOrElse(Option.scala:121)
at
org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions.<init>(JDBCOptions.scala:83)
at
org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions.<init>(JDBCOptions.scala:34)
at
org.apache.spark.sql.execution.datasources.jdbc.JdbcRelationProvider.createRelation(JdbcRelationProvider.scala:32)
at
org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:330)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:152)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:125)
... 48 elided
scala> spark.read.format("jdbc").option("url",
"jdbc:sqlite:").option("dbtable", "x").load
java.sql.SQLException: [SQLITE_ERROR] SQL error or missing database (no
such table: x)
```
### How was this patch tested?
@darabos Could you make a manual test and see whether this changes can
resolve your issue?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark jdbcDriver
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16678.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #16678
----
commit 9f5b11ba8c30a6908186ba392c090e4e9439d21d
Author: gatorsmile <[email protected]>
Date: 2017-01-23T09:01:06Z
try1
----
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