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

org.apache.hadoop.hbase.filter.ColumnPrefixFilter
This filter is used for selecting only those keys with columns that matches a particular prefix. For example, if prefix is 'an', it will pass keys with columns like 'and', 'anti' but not keys with columns like 'ball', 'act'.


                // each column family filter consists of a FamilyFilter AND a PrefixFilter
                FilterList thisColumnFilter = new FilterList(FilterList.Operator.MUST_PASS_ALL);
                thisColumnFilter.addFilter(new FamilyFilter(CompareOp.EQUAL,
                        new BinaryComparator(colInfo.getColumnFamily())));
                thisColumnFilter.addFilter(new ColumnPrefixFilter(
                        colInfo.getColumnPrefix()));


                allColumnFilters.addFilter(thisColumnFilter);
            }
        }

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      // Get all latest entry row key of all existing instances
      // Consumer state column is named as "<groupId><instanceId>"
      Get get = new Get(rowKey);
      get.addFamily(QueueEntryRow.COLUMN_FAMILY);
      get.setFilter(new ColumnPrefixFilter(Bytes.toBytes(groupId)));
      List<HBaseConsumerState> consumerStates = HBaseConsumerState.create(hTable.get(get));


      int oldInstances = consumerStates.size();


      // Nothing to do if size doesn't change

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      // Get all latest entry row key of all existing instances
      // Consumer state column is named as "<groupId><instanceId>"
      Get get = new Get(rowKey);
      get.addFamily(QueueEntryRow.COLUMN_FAMILY);
      get.setFilter(new ColumnPrefixFilter(Bytes.toBytes(groupId)));
      List<HBaseConsumerState> consumerStates = HBaseConsumerState.create(hTable.get(get));


      int oldInstances = consumerStates.size();


      // Nothing to do if size doesn't change

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  protected void fetchAll(byte[] row, byte[] columnPrefix, Map<byte[], byte[]> result) throws IOException {
    Get get = new Get(row);
    get.addFamily(QueueEntryRow.COLUMN_FAMILY);
    get.setMaxVersions(1);
    if (columnPrefix != null) {
      get.setFilter(new ColumnPrefixFilter(columnPrefix));
    }
    Result hTableResult = hTable.get(get);


    if (hTableResult.isEmpty()) {
      return;

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                                Bytes.toString(colInfo.getColumnPrefix()));
                    }


                    // add a PrefixFilter to the list of column filters
                    if (colInfo.getColumnPrefix() != null) {
                        columnFilters.addFilter(new ColumnPrefixFilter(
                            colInfo.getColumnPrefix()));
                    }
                }
                else {

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