Justin Leet created HIVE-21861:
----------------------------------
Summary: ClassCastException during CTAS over external table using
KafkaStorageHandler
Key: HIVE-21861
URL: https://issues.apache.org/jira/browse/HIVE-21861
Project: Hive
Issue Type: Bug
Components: kafka integration
Affects Versions: 0.3.0
Reporter: Justin Leet
To reproduce, create a table similar to the following:
{code}
CREATE EXTERNAL TABLE <table>
(raw_value STRING)
ROW FORMAT DELIMITED
LINES TERMINATED BY '\n'
STORED BY 'org.apache.hadoop.hive.kafka.KafkaStorageHandler'
TBLPROPERTIES(
"kafka.topic"="<kafka_topic>",
"kafka.bootstrap.servers"="<bootstrap_servers>",
"kafka.consumer.security.protocol"="PLAINTEXT",
"kafka.serde.class"="org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe");
{code}
Note the SerDe isn't the default SerDe. Additionally, this error occurs when
vectorization is enabled.
Basic queries work fine:
{code}
SELECT * FROM <table> LIMIT 1;
{code}
Doing a CTAS to bring it into a managed table fails:
{code}
CREATE TABLE <managed_table> AS
SELECT * FROM <table>;
{code}
The exception is:
{code}
Caused by: java.lang.ClassCastException:
org.apache.hadoop.hive.serde2.lazy.LazyString cannot be cast to
org.apache.hadoop.io.TextCaused by: java.lang.ClassCastException:
org.apache.hadoop.hive.serde2.lazy.LazyString cannot be cast to
org.apache.hadoop.io.Text at
org.apache.hadoop.hive.ql.exec.vector.VectorAssignRow.assignRowColumn(VectorAssignRow.java:471)
at
org.apache.hadoop.hive.ql.exec.vector.VectorAssignRow.assignRowColumn(VectorAssignRow.java:350)
at
org.apache.hadoop.hive.kafka.VectorizedKafkaRecordReader.readNextBatch(VectorizedKafkaRecordReader.java:159)
at
org.apache.hadoop.hive.kafka.VectorizedKafkaRecordReader.next(VectorizedKafkaRecordReader.java:113)
at
org.apache.hadoop.hive.kafka.VectorizedKafkaRecordReader.next(VectorizedKafkaRecordReader.java:47)
at
org.apache.hadoop.hive.ql.io.HiveContextAwareRecordReader.doNext(HiveContextAwareRecordReader.java:360)
... 24 more
{code}
A workaround to this is to disable vectorization via:
{code}
set hive.vectorized.execution.enabled = false;
{code}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
