Hi i am trying to do a mapside join in crunch using MapsideJoinStrategy class. It is working fine for inner join but it gives this error for full outer join :" Join type FULL_OUTER_JOIN not supported by MapsideJoinStrategy"
How to do a Map side full outer join in Apache Crunch ( Join type FULL_OUTER_JOIN not supported by MapsideJoinStrategy )
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MapsideJoinStrategy can not perform RIGHT_OUTER_JOIN and so FULL_OUTER_JOIN. It is impossible by design. Whole work happens in mappers (no reduce phase). Since there can be more than one mapper it is not possible to determine which key from right-side will not have matching key on left-side, because single mapper will not see whole left-side data.
For FULL_OUTER_JOIN use DefaultJoinStrategy.
I've extended BloomFilterJoinStrategy to suport all join types. Here is pull request @ GitHub.