startKey row, through to the region containing the endKey row (inclusive) will be used. If startKey or endKey is null, the first and last regions in the table, respectively, will be used in the range selection.
@param protocol the CoprocessorProtocol implementation to call
@param startKey start region selection with region containing this row
@param endKey select regions up to and including the region containingthis row
@param callable wraps the CoprocessorProtocol implementation method callsmade per-region
@param < T> CoprocessorProtocol subclass for the remote invocation
@param < R> Return type for the{@link org.apache.hadoop.hbase.client.coprocessor.Batch.Call#call(Object)}method
@return a Map of region names to{@link org.apache.hadoop.hbase.client.coprocessor.Batch.Call#call(Object)} return values
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