Examples of org.apache.hadoop.hbase.filter.FirstKeyValueMatchingQualifiersFilter

org.apache.hadoop.hbase.filter.FirstKeyValueMatchingQualifiersFilter
The filter looks for the given columns in KeyValue. Once there is a match for any one of the columns, it returns ReturnCode.NEXT_ROW for remaining KeyValues in the row.
Note : It may emit KVs which do not have the given columns in them, if these KVs happen to occur before a KV which does have a match. Given this caveat, this filter is only useful for special cases like {@link org.apache.hadoop.hbase.mapreduce.RowCounter}.

    // Hence do not use FirstKeyOnlyFilter if scan has columns, instead use
    // FirstKeyValueMatchingQualifiersFilter.
    if (qualifiers.size() == 0) {
      scan.setFilter(new FirstKeyOnlyFilter());
    } else {
      scan.setFilter(new FirstKeyValueMatchingQualifiersFilter(qualifiers));
    }
    job.setOutputFormatClass(NullOutputFormat.class);
    TableMapReduceUtil.initTableMapperJob(tableName, scan,
      RowCounterMapper.class, ImmutableBytesWritable.class, Result.class, job);
    job.setNumReduceTasks(0);

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    // Hence do not use FirstKeyOnlyFilter if scan has columns, instead use
    // FirstKeyValueMatchingQualifiersFilter.
    if (qualifiers.size() == 0) {
      scan.setFilter(new FirstKeyOnlyFilter());
    } else {
      scan.setFilter(new FirstKeyValueMatchingQualifiersFilter(qualifiers));
    }
    job.setOutputFormatClass(NullOutputFormat.class);
    TableMapReduceUtil.initTableMapperJob(tableName, scan,
      RowCounterMapper.class, ImmutableBytesWritable.class, Result.class, job);
    job.setNumReduceTasks(0);

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    // Hence do not use FirstKeyOnlyFilter if scan has columns, instead use
    // FirstKeyValueMatchingQualifiersFilter.
    if (qualifiers.size() == 0) {
      scan.setFilter(new FirstKeyOnlyFilter());
    } else {
      scan.setFilter(new FirstKeyValueMatchingQualifiersFilter(qualifiers));
    }
    scan.setTimeRange(startTime, endTime == 0 ? HConstants.LATEST_TIMESTAMP : endTime);
    job.setOutputFormatClass(NullOutputFormat.class);
    TableMapReduceUtil.initTableMapperJob(tableName, scan,
      RowCounterMapper.class, ImmutableBytesWritable.class, Result.class, job);

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    // Hence do not use FirstKeyOnlyFilter if scan has columns, instead use
    // FirstKeyValueMatchingQualifiersFilter.
    if (qualifiers.size() == 0) {
      scan.setFilter(new FirstKeyOnlyFilter());
    } else {
      scan.setFilter(new FirstKeyValueMatchingQualifiersFilter(qualifiers));
    }
    job.setOutputFormatClass(NullOutputFormat.class);
    TableMapReduceUtil.initTableMapperJob(tableName, scan,
      RowCounterMapper.class, ImmutableBytesWritable.class, Result.class, job);
    job.setNumReduceTasks(0);

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Related Classes of org.apache.hadoop.hbase.filter.FirstKeyValueMatchingQualifiersFilter

org.apache.hadoop.hbase.KeyValue

org.apache.hadoop.hbase.mapreduce.RowCounter

org.apache.hadoop.hbase.exceptions.DeserializationException

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