[ 
https://issues.apache.org/jira/browse/HIVE-14044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15365069#comment-15365069
 ] 

Sahil Takiar commented on HIVE-14044:
-------------------------------------

Is this still an issue for you? Have you seen this bug come up again?

> Newlines in Avro maps cause external table to return corrupt values
> -------------------------------------------------------------------
>
>                 Key: HIVE-14044
>                 URL: https://issues.apache.org/jira/browse/HIVE-14044
>             Project: Hive
>          Issue Type: Bug
>         Environment: Hive version: 1.1.0-cdh5.5.1 (bundled with cloudera 
> 5.5.1)
>            Reporter: David Nies
>            Assignee: Sahil Takiar
>            Priority: Critical
>         Attachments: test.json, test.schema
>
>
> When {{\n}} characters are contained in Avro files that are used as data 
> bases for an external table, the result of {{SELECT}} queries may be corrupt. 
> I encountered this error when querying hive both from {{beeline}} and from 
> JDBC.
> h3. Steps to reproduce (used files are attached to ticket)
> # Create an {{.avro}} file that contains newline characters in a value of a 
> map:
> {code}
> avro-tools fromjson --schema-file test.schema test.json > test.avro
> {code}
> # Copy {{.avro}} file to HDFS
> {code}
> hdfs dfs -copyFromLocal test.avro /some/location/
> {code}
> # Create an external table in beeline containing this {{.avro}}:
> {code}
> beeline> CREATE EXTERNAL TABLE broken_newline_map
> ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.avro.AvroSerDe'
> STORED AS
> INPUTFORMAT 'org.apache.hadoop.hive.ql.io.avro.AvroContainerInputFormat'
> OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.avro.AvroContainerOutputFormat'
> LOCATION '/some/location/'
> TBLPROPERTIES ('avro.schema.literal'='
> {
>   "type" : "record",
>   "name" : "myEntry",
>   "namespace" : "myNamespace",
>   "fields" : [ {
>     "name" : "foo",
>     "type" : "long"
>   }, {
>     "name" : "bar",
>     "type" : {
>       "type" : "map",
>       "values" : "string"
>     }
>   } ]
> }
> ');
> {code}
> # Now, selecting may return corrupt results:
> {code}
> jdbc:hive2://my-server:10000/> select * from broken_newline_map;
> +-------------------------+---------------------------------------------------+--+
> | broken_newline_map.foo  |              broken_newline_map.bar               
> |
> +-------------------------+---------------------------------------------------+--+
> | 1                       | {"key2":"value2","key1":"value1\nafter newline"}  
> |
> | 2                       | {"key2":"new value2","key1":"new value"}          
> |
> +-------------------------+---------------------------------------------------+--+
> 2 rows selected (1.661 seconds)
> jdbc:hive2://my-server:10000/> select foo, map_keys(bar), map_values(bar) 
> from broken_newline_map;
> +-------+------------------+-----------------------------+--+
> |  foo  |       _c1        |             _c2             |
> +-------+------------------+-----------------------------+--+
> | 1     | ["key2","key1"]  | ["value2","value1"]         |
> | NULL  | NULL             | NULL                        |
> | 2     | ["key2","key1"]  | ["new value2","new value"]  |
> +-------+------------------+-----------------------------+--+
> 3 rows selected (28.05 seconds)
> {code}
> Obviously, the last result set contains corrupt entries (line 2) and 
> incorrect entries (line 1). I also encountered this when doing this query 
> with JDBC. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Reply via email to