[jira] [Created] (PIG-5076) Pig 0.15.0 cannot STORE the same alias into HDFS and Mysql both?

["Joanlynn LIN (JIRA)" <ji...@apache.org>]

Joanlynn LIN created PIG-5076:
---------------------------------

             Summary: Pig 0.15.0 cannot STORE the same alias into HDFS and Mysql both?
                 Key: PIG-5076
                 URL: https://issues.apache.org/jira/browse/PIG-5076
             Project: Pig
          Issue Type: Bug
          Components: piggybank
    Affects Versions: 0.15.0
         Environment: Pig 0.15.0; hadoop 2.7.1; 
            Reporter: Joanlynn LIN


I am using Pig 0.15.0 and have found that maybe it does not support STOREing an alias onto HDFS and Mysql both. the question is simplified as follows:

first, I have a data file on hdfs://tmp/file, which contains:
	
	1046074327,40986
	1473299786,1

then, I created a Mysql table db_test, whose schema is:

	CREATE TABLE `db_test` (
  		`app_id` bigint(20) NOT NULL,
  		`cnt` bigint(20) NOT NULL
	) ENGINE=InnoDB DEFAULT CHARSET=utf8;

then I have written a Pig script which runs in mapreduce mode on Hadoop 2.7.1, and the script contains:

    REGISTER '/path/to/mysql-connector-java-5.1.38-bin.jar';

	%declare DBHOST '127.0.0.1'
	%declare DBPORT '3306'
	%declare DATABASE 'test'
	%declare USERNAME 'root'
	%declare PASSWORD 'toor'

	a = load '/tmp/file' USING PigStorage(',') AS (id:long, cnt:long);

	STORE a INTO '/tmp/db_test2' USING PigStorage(',');

	STORE a INTO 'db_test' USING org.apache.pig.piggybank.storage.DBStorage('com.mysql.jdbc.Driver', 
    	'jdbc:mysql://$DBHOST:$DBPORT/$DATABASE?useUnicode=true&characterEncoding=utf-8',
    	'$USERNAME', '$PASSWORD', 
    	'REPLACE INTO db_test (id, cnt) VALUES (?,?)');

however, the second STORE will never work, without any error reported. However, if I comment the first STORE line, the second STORE will work! What a magic!

I have tried to use Pig 0.16.0 in local mode on my own host and it can even not instantiate mysql:

	Caused by: java.lang.RuntimeException: could not instantiate 'org.apache.pig.piggybank.storage.DBStorage' with arguments '[com.mysql.jdbc.Driver, jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8, root, toor, REPLACE INTO db_test (app_id, cnt) VALUES (?,?)]'
	at org.apache.pig.impl.PigContext.instantiateFuncFromSpec(PigContext.java:770)
	at org.apache.pig.parser.LogicalPlanBuilder.buildStoreOp(LogicalPlanBuilder.java:988)
	... 17 more
	Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
	at org.apache.pig.impl.PigContext.instantiateFuncFromSpec(PigContext.java:738)
	... 18 more
	Caused by: java.lang.RuntimeException: Can't load DB Driver
	at org.apache.pig.piggybank.storage.DBStorage.<init>(DBStorage.java:82)
	at org.apache.pig.piggybank.storage.DBStorage.<init>(DBStorage.java:71)
	... 23 more
	Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at org.apache.pig.piggybank.storage.DBStorage.<init>(DBStorage.java:79)
	... 24 more

The 'instantiate' problem may be due to my environment settings, and I will keep trying.

And can somebody help me with the 'two STORE' problem? Would it possibly be a bug? 




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