The following incompatible changes occurred between Cloudera Search for CDH 5 beta 2 and older versions of Cloudera Search including both earlier versions of Cloudera Search for CDH 5 and Cloudera Search 1.x:

• Supported values for the --reducers option of the MapReduceIndexer tool change with the release of Search for CDH 5 beta 2. To use one reducer per output shard, 0 is used in Search 1.x and Search for CDH 5 beta 1. With the release of Search for CDH 5 beta 2, -2 is used for one reducer per output shard. Because of this change, commands using --reducers 0 that were written for previous Search releases do not continue to work in the same way after upgrading to Search for CDH 5 beta 2. After upgrading to Search for CDH 5 beta 2, using --reducers 0 results in an exception stating that zero is an illegal value.