Field Detail

• log

  protected static final org.apache.commons.logging.Log log

Constructor Detail

• AggregateImplementation

  public AggregateImplementation()

Method Detail

• getMax

  public void getMax(com.google.protobuf.RpcController controller,
            org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateRequest request,
            com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateResponse> done)

  Gives the maximum for a given combination of column qualifier and column family, in the given row range as defined in the Scan object. In its current implementation, it takes one column family and one column qualifier (if provided). In case of null column qualifier, maximum value for the entire column family will be returned.

  Specified by:

  getMax in class org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateService

• getMin

  public void getMin(com.google.protobuf.RpcController controller,
            org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateRequest request,
            com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateResponse> done)

  Gives the minimum for a given combination of column qualifier and column family, in the given row range as defined in the Scan object. In its current implementation, it takes one column family and one column qualifier (if provided). In case of null column qualifier, minimum value for the entire column family will be returned.

  Specified by:

  getMin in class org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateService

• getSum

  public void getSum(com.google.protobuf.RpcController controller,
            org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateRequest request,
            com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateResponse> done)

  Gives the sum for a given combination of column qualifier and column family, in the given row range as defined in the Scan object. In its current implementation, it takes one column family and one column qualifier (if provided). In case of null column qualifier, sum for the entire column family will be returned.

  Specified by:

  getSum in class org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateService

• getRowNum

  public void getRowNum(com.google.protobuf.RpcController controller,
               org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateRequest request,
               com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateResponse> done)

  Gives the row count for the given column family and column qualifier, in the given row range as defined in the Scan object.

  Specified by:

  getRowNum in class org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateService

• getAvg

  public void getAvg(com.google.protobuf.RpcController controller,
            org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateRequest request,
            com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateResponse> done)

  Gives a Pair with first object as Sum and second object as row count, computed for a given combination of column qualifier and column family in the given row range as defined in the Scan object. In its current implementation, it takes one column family and one column qualifier (if provided). In case of null column qualifier, an aggregate sum over all the entire column family will be returned.

  The average is computed in AggregationClient#avg(byte[], ColumnInterpreter, Scan) by processing results from all regions, so its "ok" to pass sum and a Long type.

  Specified by:

  getAvg in class org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateService

• getStd

  public void getStd(com.google.protobuf.RpcController controller,
            org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateRequest request,
            com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateResponse> done)

  Gives a Pair with first object a List containing Sum and sum of squares, and the second object as row count. It is computed for a given combination of column qualifier and column family in the given row range as defined in the Scan object. In its current implementation, it takes one column family and one column qualifier (if provided). The idea is get the value of variance first: the average of the squares less the square of the average a standard deviation is square root of variance.

  Specified by:

  getStd in class org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateService

• getMedian

  public void getMedian(com.google.protobuf.RpcController controller,
               org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateRequest request,
               com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateResponse> done)

  Gives a List containing sum of values and sum of weights. It is computed for the combination of column family and column qualifier(s) in the given row range as defined in the Scan object. In its current implementation, it takes one column family and two column qualifiers. The first qualifier is for values column and the second qualifier (optional) is for weight column.

  Specified by:

  getMedian in class org.apache.hadoop.hbase.protobuf.generated.AggregateProtos.AggregateService

• getService

  public com.google.protobuf.Service getService()

  Specified by:

  getService in interface CoprocessorService

• start

  public void start(CoprocessorEnvironment env)
             throws IOException

  Stores a reference to the coprocessor environment provided by the RegionCoprocessorHost from the region where this coprocessor is loaded. Since this is a coprocessor endpoint, it always expects to be loaded on a table region, so always expects this to be an instance of RegionCoprocessorEnvironment.

  Specified by:

  start in interface Coprocessor

  Parameters:

  env - the environment provided by the coprocessor host

  Throws:

  IOException - if the provided environment is not an instance of RegionCoprocessorEnvironment

• stop

  public void stop(CoprocessorEnvironment env)
            throws IOException

  Specified by:

  stop in interface Coprocessor

  Throws:

  IOException