GitHub user yueqianzhu opened a pull request:
https://github.com/apache/spark/pull/9515
[SPARK-11547] set fetchSize default value in JDBCRDD
if I do not set any properties manual for jdbc, when I show the data in the
table, it will throw an exception like below:
Exception in thread "main" java.lang.NullPointerException
at java.util.Hashtable.putAll(Hashtable.java:522)
at org.apache.spark.sql.DataFrameReader.jdbc(DataFrameReader.scala:205)
at org.apache.spark.sql.DataFrameReader.jdbc(DataFrameReader.scala:130)
my test code:
//sqlContext : An existing SparkContext
val df1 =
sqlContext.read.jdbc("jdbc:mysql://IP:PORT/XXX?user=XXX&password=XXX","tablename",null)
df1.show
This PR Makes it easier to operate, especially for a novice.
https://issues.apache.org/jira/browse/SPARK-11547
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yueqianzhu/spark my_change
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9515.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 #9515
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commit 7a1b8223c1c4adf88e26e03d99ac2380532c4055
Author: yueqian_zhu <[email protected]>
Date: 2015-11-06T03:35:59Z
set fetchSize in file JDBCRDD.scala default value to "10"
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