Database Reference
In-Depth Information
ColumnFamilyOutputFormat
The OutputFormat class is the mechanism of writing the result from MapReduce to a
permanent (usually) storage. Cassandra implements Hadoop's OutputFormat , that is,
ColumnFamilyOutputFormat . It enables Hadoop to write the result from the reduce
task as column family rows. It is implemented such that the results are written, to the
column family, in batches. This is a performance improvement, and this mechanism is
called lazy write-back caching.
Search WWH ::




Custom Search