[IMPALA-290] Improve error message when trying to use LZO compression on file formats other than text

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 0.7
• Fix Version/s: Impala 1.0
• Assignee: Nong Li
• Reporter: Lenni Kuff
• Created: 19/Apr/13 20:10
• Updated: 24/Apr/13 23:13
• Resolved: 24/Apr/13 23:13

Description

A user ran into a problem when they tried to use LZO compressed RC file. Instead of displaying a clear "Not Yet Supported/Implemented" error, the query failed with an Unknown Codec message. It would be good to improve this.

$ impala-shell -i <host1> -f <SQL file>
	Connected to <host1>:21000
	Query: select count(distinct column1) from TABLE_A
	Query aborted, unable to fetch data

	Backend 6:Unknown Codec: com.hadoop.compression.lzo.LzopCodec
	Backend 7:Unknown Codec: com.hadoop.compression.lzo.LzopCodec
	Backend 8:Unknown Codec: com.hadoop.compression.lzo.LzopCodec
	Backend 9:Unknown Codec: com.hadoop.compression.lzo.LzopCodec
	Backend 10:Unknown Codec: com.hadoop.compression.lzo.LzopCodec
	Backend 11:Unknown Codec: com.hadoop.compression.lzo.LzopCodec