Sahil Takiar created IMPALA-8549: ------------------------------------ Summary: Add support for scanning DEFLATE text files Key: IMPALA-8549 URL: https://issues.apache.org/jira/browse/IMPALA-8549 Project: IMPALA Issue Type: Improvement Components: Backend Reporter: Sahil Takiar
Several Hadoop tools (e.g. Hive, MapReduce, etc.) support reading and writing text files stored using zlib / deflate (results in files such as {{000000_0.deflate}}). Impala currently does not support reading {{.deflate}} files and returns errors such as: {{ERROR: Scanner plugin 'DEFLATE' is not one of the enabled plugins: 'LZO'}}. Moreover, the default compression codec in Hadoop is zlib / deflate (see {{o.a.h.io.compress.DefaultCodec}}). So when writing to a text table in Hive, if users set {{hive.exec.compress.output}} to true, then {{.deflate}} files will be written by default. Impala does support zlib / deflate with other file formats though: Avro, RCFiles, SequenceFiles (see https://impala.apache.org/docs/build/html/topics/impala_file_formats.html). -- This message was sent by Atlassian JIRA (v7.6.3#76005)