Joanlynn LIN created PIG-5076:
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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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