[HIVE-6670] ClassNotFound with Serde

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.12.0
• Fix Version/s: 0.13.0
• Assignee: Abin Shahab
• Reporter: Abin Shahab
• Created: 14/Mar/14 17:37
• Updated: 27/Mar/14 22:38
• Resolved: 27/Mar/14 22:38

Description

We are finding a ClassNotFound exception when we use CSVSerde(https://github.com/ogrodnek/csv-serde) to create a table.
This is happening because MapredLocalTask does not pass the local added jars to ExecDriver when that is launched.
ExecDriver's classpath does not include the added jars. Therefore, when the plan is deserialized, it throws a ClassNotFoundException in the deserialization code, and results in a TableDesc object with a Null DeserializerClass.
This results in an NPE during Fetch.
Steps to reproduce:
wget https://drone.io/github.com/ogrodnek/csv-serde/files/target/csv-serde-1.1.2-0.11.0-all.jar into somewhere local eg. /home/soam/HiveSerdeIssue/csv-serde-1.1.2-0.11.0-all.jar.
Place some sample SCV files in HDFS as follows:
hdfs dfs -mkdir /user/soam/HiveSerdeIssue/sampleCSV/
hdfs dfs -put /home/soam/sampleCSV.csv /user/soam/HiveSerdeIssue/sampleCSV/
hdfs dfs -mkdir /user/soam/HiveSerdeIssue/sampleJoinTarget/
hdfs dfs -put /home/soam/sampleJoinTarget.csv /user/soam/HiveSerdeIssue/sampleJoinTarget/
====
create the tables in hive:
ADD JAR /home/soam/HiveSerdeIssue/csv-serde-1.1.2-0.11.0-all.jar;
create external table sampleCSV (md5hash string, filepath string)
row format serde 'com.bizo.hive.serde.csv.CSVSerde'
stored as textfile
location '/user/soam/HiveSerdeIssue/sampleCSV/'
;
create external table sampleJoinTarget (md5hash string, filepath string, datestamp string, nblines string, nberrors string)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY ','
LINES TERMINATED BY '\n'
STORED AS TEXTFILE
LOCATION '/user/soam/HiveSerdeIssue/sampleJoinTarget/'
;
===============
Now, try the following JOIN:
ADD JAR /home/soam/HiveSerdeIssue/csv-serde-1.1.2-0.11.0-all.jar;
SELECT
sampleCSV.md5hash,
sampleCSV.filepath
FROM sampleCSV
JOIN sampleJoinTarget
ON (sampleCSV.md5hash = sampleJoinTarget.md5hash)
;
—
This will fail with the error:
Execution log at: /tmp/soam/.log
java.lang.ClassNotFoundException: com/bizo/hive/serde/csv/CSVSerde
Continuing ...
2014-03-11 10:35:03 Starting to launch local task to process map join; maximum memory = 238551040
Execution failed with exit status: 2
Obtaining error information
Task failed!
Task ID:
Stage-4
Logs:
/var/log/hive/soam/hive.log
FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapredLocalTask
Try the following LEFT JOIN. This will work:
SELECT
sampleCSV.md5hash,
sampleCSV.filepath
FROM sampleCSV
LEFT JOIN sampleJoinTarget
ON (sampleCSV.md5hash = sampleJoinTarget.md5hash)
;
==

Issue Links

• links to: RB request