Java Code Examples for org.apache.hadoop.hbase.filter.PageFilter

The following examples show how to use org.apache.hadoop.hbase.filter.PageFilter. These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source Project: hgraphdb   Source File: VertexIndexModel.java    License: Apache License 2.0 6 votes vote down vote up
private Scan getVertexIndexScanWithLimit(String label, boolean isUnique, String key, Object from, int limit, boolean reversed) {
    byte[] prefix = serializeForRead(label, isUnique, key, null);
    byte[] startRow = from != null
            ? serializeForRead(label, isUnique, key, from)
            : prefix;
    byte[] stopRow = HConstants.EMPTY_END_ROW;
    if (graph.configuration().getInstanceType() == HBaseGraphConfiguration.InstanceType.BIGTABLE) {
        if (reversed) {
            throw new UnsupportedOperationException("Reverse scans not supported by Bigtable");
        } else {
            // PrefixFilter in Bigtable does not automatically stop
            // See https://github.com/GoogleCloudPlatform/cloud-bigtable-client/issues/1087
            stopRow = HBaseGraphUtils.incrementBytes(prefix);
        }
    }
    if (reversed) startRow = HBaseGraphUtils.incrementBytes(startRow);
    Scan scan = new Scan(startRow, stopRow);
    FilterList filterList = new FilterList();
    filterList.addFilter(new PrefixFilter(prefix));
    filterList.addFilter(new PageFilter(limit));
    scan.setFilter(filterList);
    scan.setReversed(reversed);
    return scan;
}
 
Example 2
Source Project: geowave   Source File: HBaseReader.java    License: Apache License 2.0 6 votes vote down vote up
private static <T> void setLimit(
    final RangeReaderParams<T> readerParams,
    final FilterList filterList) {
  if ((readerParams.getLimit() != null) && (readerParams.getLimit() > 0)) {
    // @formatter:off
    // TODO in hbase 1.4.x there is a scan.getLimit() and
    // scan.setLimit() which is perfectly suited for this
    //			if (readerParams.getLimit() < scanner.getLimit() || scanner.getLimit() <= 0) {
    // also in hbase 1.4.x readType.PREAD would make sense for
    // limits
    // 				scanner.setReadType(ReadType.PREAD);
    //				scanner.setLimit(
    //						readerParams.getLimit());
    //			}
    // @formatter:on
    // however, to be compatible with earlier versions of hbase, for now
    // we are using a page filter
    filterList.addFilter(new PageFilter(readerParams.getLimit()));
  }
}
 
Example 3
Source Project: tephra   Source File: HbaseQuery.java    License: MIT License 5 votes vote down vote up
/**
 * 获取过滤器。
 *
 * @return 过滤器。
 */
public synchronized Filter getFilter() {
    if (pageSize > 0) {
        addFilter(new PageFilter(pageSize));
        pageSize = 0L;
    }

    return filters;
}
 
Example 4
Source Project: hgraphdb   Source File: EdgeModel.java    License: Apache License 2.0 5 votes vote down vote up
public Iterator<Edge> edges(Object fromId, int limit) {
    final EdgeReader parser = new EdgeReader(graph);

    Scan scan = fromId != null ? new Scan(ValueUtils.serializeWithSalt(fromId)) : new Scan();
    scan.setFilter(new PageFilter(limit));
    ResultScanner scanner = null;
    try {
        scanner = table.getScanner(scan);
        return CloseableIteratorUtils.limit(HBaseGraphUtils.mapWithCloseAtEnd(scanner, parser::parse), limit);
    } catch (IOException e) {
        throw new HBaseGraphException(e);
    }
}
 
Example 5
Source Project: hgraphdb   Source File: VertexModel.java    License: Apache License 2.0 5 votes vote down vote up
public Iterator<Vertex> vertices(Object fromId, int limit) {
    final VertexReader parser = new VertexReader(graph);

    Scan scan = fromId != null ? new Scan(ValueUtils.serializeWithSalt(fromId)) : new Scan();
    scan.setFilter(new PageFilter(limit));
    ResultScanner scanner = null;
    try {
        scanner = table.getScanner(scan);
        return CloseableIteratorUtils.limit(HBaseGraphUtils.mapWithCloseAtEnd(scanner, parser::parse), limit);
    } catch (IOException e) {
        throw new HBaseGraphException(e);
    }
}
 
Example 6
Source Project: hbase   Source File: PerformanceEvaluation.java    License: Apache License 2.0 5 votes vote down vote up
@Override
boolean testRow(final int i) throws IOException {
  Scan scan = new Scan().withStartRow(getRandomRow(this.rand, opts.totalRows))
      .setCaching(opts.caching).setCacheBlocks(opts.cacheBlocks)
      .setAsyncPrefetch(opts.asyncPrefetch).setReadType(opts.scanReadType)
      .setScanMetricsEnabled(true);
  FilterList list = new FilterList();
  for (int family = 0; family < opts.families; family++) {
    byte[] familyName = Bytes.toBytes(FAMILY_NAME_BASE + family);
    if (opts.addColumns) {
      for (int column = 0; column < opts.columns; column++) {
        byte [] qualifier = column == 0? COLUMN_ZERO: Bytes.toBytes("" + column);
        scan.addColumn(familyName, qualifier);
      }
    } else {
      scan.addFamily(familyName);
    }
  }
  if (opts.filterAll) {
    list.addFilter(new FilterAllFilter());
  }
  list.addFilter(new WhileMatchFilter(new PageFilter(120)));
  scan.setFilter(list);
  ResultScanner s = this.table.getScanner(scan);
  try {
    for (Result rr; (rr = s.next()) != null;) {
      updateValueSize(rr);
    }
  } finally {
    updateScanMetrics(s.getScanMetrics());
    s.close();
  }
  return true;
}
 
Example 7
Source Project: hbase   Source File: PerformanceEvaluation.java    License: Apache License 2.0 5 votes vote down vote up
@Override
void testRow(final int i) throws IOException {
  Scan scan = new Scan().withStartRow(getRandomRow(this.rand, this.totalRows));
  scan.addColumn(FAMILY_NAME, QUALIFIER_NAME);
  scan.setFilter(new WhileMatchFilter(new PageFilter(120)));
  ResultScanner s = this.table.getScanner(scan);
  s.close();
}
 
Example 8
Source Project: phoenix   Source File: BaseResultIterators.java    License: Apache License 2.0 5 votes vote down vote up
/**
 * Return row count limit of PageFilter if exists and there is no where
 * clause filter.
 * @return
 */
private static Long getUnfilteredPageLimit(Scan scan) {
    Long pageLimit = null;
    Iterator<Filter> filters = ScanUtil.getFilterIterator(scan);
    while (filters.hasNext()) {
        Filter filter = filters.next();
        if (filter instanceof BooleanExpressionFilter) {
            return null;
        }
        if (filter instanceof PageFilter) {
            pageLimit = ((PageFilter)filter).getPageSize();
        }
    }
    return pageLimit;
}
 
Example 9
public ParallelIterators(StatementContext context, TableRef tableRef, FilterableStatement statement, RowProjector projector, GroupBy groupBy, Integer limit, ParallelIteratorFactory iteratorFactory) throws SQLException {
    super(context, tableRef, groupBy);
    this.splits = getSplits(context, tableRef, statement.getHint());
    this.iteratorFactory = iteratorFactory;
    Scan scan = context.getScan();
    PTable table = tableRef.getTable();
    if (projector.isProjectEmptyKeyValue()) {
        Map<byte [], NavigableSet<byte []>> familyMap = scan.getFamilyMap();
        // If nothing projected into scan and we only have one column family, just allow everything
        // to be projected and use a FirstKeyOnlyFilter to skip from row to row. This turns out to
        // be quite a bit faster.
        if (familyMap.isEmpty() && table.getColumnFamilies().size() == 1) {
            // Project the one column family. We must project a column family since it's possible
            // that there are other non declared column families that we need to ignore.
            scan.addFamily(table.getColumnFamilies().get(0).getName().getBytes());
            ScanUtil.andFilterAtBeginning(scan, new FirstKeyOnlyFilter());
        } else {
            byte[] ecf = SchemaUtil.getEmptyColumnFamily(table.getColumnFamilies());
            // Project empty key value unless the column family containing it has
            // been projected in its entirety.
            if (!familyMap.containsKey(ecf) || familyMap.get(ecf) != null) {
                scan.addColumn(ecf, QueryConstants.EMPTY_COLUMN_BYTES);
            }
        }
    }
    if (limit != null) {
        ScanUtil.andFilterAtEnd(scan, new PageFilter(limit));
    }
}
 
Example 10
Source Project: atlas   Source File: HBaseBasedAuditRepository.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * List events for the given entity id in decreasing order of timestamp, from the given startKey. Returns n results
 * @param entityId entity id
 * @param startKey key for the first event to be returned, used for pagination
 * @param n number of events to be returned
 * @return list of events
 * @throws AtlasException
 */
public List<EntityAuditEvent> listEventsV1(String entityId, String startKey, short n)
        throws AtlasException {
    if (LOG.isDebugEnabled()) {
        LOG.debug("Listing events for entity id {}, starting timestamp {}, #records {}", entityId, startKey, n);
    }

    Table table = null;
    ResultScanner scanner = null;
    try {
        table = connection.getTable(tableName);

        /**
         * Scan Details:
         * In hbase, the events are stored in increasing order of timestamp. So, doing reverse scan to get the latest event first
         * Page filter is set to limit the number of results returned.
         * Stop row is set to the entity id to avoid going past the current entity while scanning
         * small is set to true to optimise RPC calls as the scanner is created per request
         */
        Scan scan = new Scan().setReversed(true).setFilter(new PageFilter(n))
                .setStopRow(Bytes.toBytes(entityId))
                .setCaching(n)
                .setSmall(true);
        if (StringUtils.isEmpty(startKey)) {
            //Set start row to entity id + max long value
            byte[] entityBytes = getKey(entityId, Long.MAX_VALUE, Integer.MAX_VALUE);
            scan = scan.setStartRow(entityBytes);
        } else {
            scan = scan.setStartRow(Bytes.toBytes(startKey));
        }
        scanner = table.getScanner(scan);
        Result result;
        List<EntityAuditEvent> events = new ArrayList<>();

        //PageFilter doesn't ensure n results are returned. The filter is per region server.
        //So, adding extra check on n here
        while ((result = scanner.next()) != null && events.size() < n) {
            EntityAuditEvent event = fromKey(result.getRow());

            //In case the user sets random start key, guarding against random events
            if (!event.getEntityId().equals(entityId)) {
                continue;
            }
            event.setUser(getResultString(result, COLUMN_USER));
            event.setAction(EntityAuditEvent.EntityAuditAction.fromString(getResultString(result, COLUMN_ACTION)));
            event.setDetails(getResultString(result, COLUMN_DETAIL));
            if (persistEntityDefinition) {
                String colDef = getResultString(result, COLUMN_DEFINITION);
                if (colDef != null) {
                    event.setEntityDefinition(colDef);
                }
            }
            events.add(event);
        }

        if (LOG.isDebugEnabled()) {
            LOG.debug("Got events for entity id {}, starting timestamp {}, #records {}", entityId, startKey, events.size());
        }

        return events;
    } catch (IOException e) {
        throw new AtlasException(e);
    } finally {
        close(scanner);
        close(table);
    }
}
 
Example 11
Source Project: incubator-atlas   Source File: HBaseBasedAuditRepository.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * List events for the given entity id in decreasing order of timestamp, from the given startKey. Returns n results
 * @param entityId entity id
 * @param startKey key for the first event to be returned, used for pagination
 * @param n number of events to be returned
 * @return list of events
 * @throws AtlasException
 */
public List<EntityAuditEvent> listEvents(String entityId, String startKey, short n)
        throws AtlasException {
    if (LOG.isDebugEnabled()) {
        LOG.debug("Listing events for entity id {}, starting timestamp {}, #records {}", entityId, startKey, n);
    }

    Table table = null;
    ResultScanner scanner = null;
    try {
        table = connection.getTable(tableName);

        /**
         * Scan Details:
         * In hbase, the events are stored in increasing order of timestamp. So, doing reverse scan to get the latest event first
         * Page filter is set to limit the number of results returned.
         * Stop row is set to the entity id to avoid going past the current entity while scanning
         * small is set to true to optimise RPC calls as the scanner is created per request
         */
        Scan scan = new Scan().setReversed(true).setFilter(new PageFilter(n))
                              .setStopRow(Bytes.toBytes(entityId))
                              .setCaching(n)
                              .setSmall(true);
        if (StringUtils.isEmpty(startKey)) {
            //Set start row to entity id + max long value
            byte[] entityBytes = getKey(entityId, Long.MAX_VALUE);
            scan = scan.setStartRow(entityBytes);
        } else {
            scan = scan.setStartRow(Bytes.toBytes(startKey));
        }
        scanner = table.getScanner(scan);
        Result result;
        List<EntityAuditEvent> events = new ArrayList<>();

        //PageFilter doesn't ensure n results are returned. The filter is per region server.
        //So, adding extra check on n here
        while ((result = scanner.next()) != null && events.size() < n) {
            EntityAuditEvent event = fromKey(result.getRow());

            //In case the user sets random start key, guarding against random events
            if (!event.getEntityId().equals(entityId)) {
                continue;
            }
            event.setUser(getResultString(result, COLUMN_USER));
            event.setAction(EntityAuditEvent.EntityAuditAction.valueOf(getResultString(result, COLUMN_ACTION)));
            event.setDetails(getResultString(result, COLUMN_DETAIL));
            if (persistEntityDefinition) {
                String colDef = getResultString(result, COLUMN_DEFINITION);
                if (colDef != null) {
                    event.setEntityDefinition(colDef);
                }
            }
            events.add(event);
        }

        if (LOG.isDebugEnabled()) {
            LOG.debug("Got events for entity id {}, starting timestamp {}, #records {}", entityId, startKey, events.size());
        }

        return events;
    } catch (IOException e) {
        throw new AtlasException(e);
    } finally {
        close(scanner);
        close(table);
    }
}
 
Example 12
Source Project: streamline   Source File: HBaseScanConfig.java    License: Apache License 2.0 4 votes vote down vote up
public void setNumRows(int n) {
    this.filterList.addFilter(new PageFilter(n == 0 ? DEFAULT_NUM_ROWS : n));
}
 
Example 13
Source Project: streamline   Source File: HBaseScanConfigBuilderTest.java    License: Apache License 2.0 4 votes vote down vote up
@Test
public void testGetScanConfig() throws Exception {
    final List<Criteria.Field> fr = new ArrayList<>();
    fr.add(new CriteriaImpl.FieldImpl("notifierName", "test_notifier"));
    fr.add(new CriteriaImpl.FieldImpl("status", "NEW"));


    final List<byte[]> nnList = Arrays.asList("s".getBytes(CHARSET),
                                              "qs".getBytes(CHARSET),
                                              "NEW".getBytes(CHARSET));
    new Expectations() {
        {
            mockNotificationCriteria.clazz();
            times = 1;
            result = Notification.class;
            mockNotificationCriteria.fieldRestrictions();
            times = 1;
            result = fr;
            mockIndexMapper.getIndexedFieldNames(); times = 1;
            result = Arrays.asList("notifierName");
            mockNotificationCriteria.numRows(); times = 1;
            result = 5;
            mockIndexMapper.mapMemberValue("status", "NEW"); times = 1;
            result = nnList;
        }
    };

    hBaseScanConfigBuilder = new HBaseScanConfigBuilder();
    hBaseScanConfigBuilder.addMappers(Notification.class, Arrays.asList(mockIndexMapper));

    Criteria<Notification> eventCriteria = new CriteriaImpl<>(Notification.class);

    HBaseScanConfig<Notification> notificationScanConfig = hBaseScanConfigBuilder.getScanConfig(mockNotificationCriteria);

    System.out.println(notificationScanConfig);
    assertEquals(mockIndexMapper, notificationScanConfig.getMapper());
    assertArrayEquals("test_notifier|0".getBytes(CHARSET), notificationScanConfig.getStartRow());
    assertArrayEquals(("test_notifier|"+Long.MAX_VALUE).getBytes(CHARSET), notificationScanConfig.getStopRow());
    assertEquals(2, notificationScanConfig.filterList().getFilters().size());
    // column filter should be first
    Filter firstFilter = notificationScanConfig.filterList().getFilters().get(0);
    assertEquals(SingleColumnValueFilter.class, firstFilter.getClass());
    // page filter should be last
    Filter secondFilter = notificationScanConfig.filterList().getFilters().get(1);
    assertEquals(PageFilter.class, secondFilter.getClass());
}
 
Example 14
Source Project: streamline   Source File: HBaseScanConfigBuilderTest.java    License: Apache License 2.0 4 votes vote down vote up
@Test
public void testGetScanConfigWithTs() throws Exception {
    final List<Criteria.Field> fr = new ArrayList<>();
    fr.add(new CriteriaImpl.FieldImpl("notifierName", "test_notifier"));
    fr.add(new CriteriaImpl.FieldImpl("status", "NEW"));

    final long ts = System.currentTimeMillis();
    final long endts = ts + 100;

    final List<byte[]> nnList = Arrays.asList("s".getBytes(CHARSET),
                                              "qs".getBytes(CHARSET),
                                              "NEW".getBytes(CHARSET));
    new Expectations() {
        {
            mockNotificationCriteria.clazz();
            times = 1;
            result = Notification.class;
            mockNotificationCriteria.fieldRestrictions();
            times = 1;
            result = fr;
            mockIndexMapper.getIndexedFieldNames(); times = 1;
            result = Arrays.asList("notifierName");
            mockNotificationCriteria.numRows(); times = 1;
            result = 5;
            mockIndexMapper.mapMemberValue("status", "NEW"); times = 1;
            result = nnList;
            mockNotificationCriteria.startTs();
            result = ts;
            mockNotificationCriteria.endTs();
            result = endts;
        }
    };

    hBaseScanConfigBuilder = new HBaseScanConfigBuilder();
    hBaseScanConfigBuilder.addMappers(Notification.class, Arrays.asList(mockIndexMapper));

    Criteria<Notification> eventCriteria = new CriteriaImpl<>(Notification.class);

    HBaseScanConfig<Notification> notificationScanConfig = hBaseScanConfigBuilder.getScanConfig(mockNotificationCriteria);

    System.out.println(notificationScanConfig);
    assertEquals(mockIndexMapper, notificationScanConfig.getMapper());
    assertArrayEquals(("test_notifier|"+ts).getBytes(CHARSET), notificationScanConfig.getStartRow());
    assertArrayEquals(("test_notifier|"+endts).getBytes(CHARSET), notificationScanConfig.getStopRow());
    assertEquals(2, notificationScanConfig.filterList().getFilters().size());
    // column filter should be first
    Filter firstFilter = notificationScanConfig.filterList().getFilters().get(0);
    assertEquals(SingleColumnValueFilter.class, firstFilter.getClass());
    // page filter should be last
    Filter secondFilter = notificationScanConfig.filterList().getFilters().get(1);
    assertEquals(PageFilter.class, secondFilter.getClass());
}
 
Example 15
Source Project: phoenix   Source File: ExplainTable.java    License: Apache License 2.0 4 votes vote down vote up
private PageFilter getPageFilter(List<Filter> filterList) {
    for (Filter filter : filterList) {
        if (filter instanceof PageFilter) return (PageFilter)filter;
    }
    return null;
}
 
Example 16
Source Project: phoenix   Source File: BaseResultIterators.java    License: Apache License 2.0 4 votes vote down vote up
public BaseResultIterators(QueryPlan plan, Integer perScanLimit) throws SQLException {
    super(plan.getContext(), plan.getTableRef(), plan.getGroupBy(), plan.getOrderBy(), plan.getStatement().getHint());
    this.plan = plan;
    StatementContext context = plan.getContext();
    TableRef tableRef = plan.getTableRef();
    PTable table = tableRef.getTable();
    FilterableStatement statement = plan.getStatement();
    RowProjector projector = plan.getProjector();
    physicalTableName = table.getPhysicalName().getBytes();
    tableStats = useStats() ? new MetaDataClient(context.getConnection()).getTableStats(table) : PTableStats.EMPTY_STATS;
    Scan scan = context.getScan();
    // Used to tie all the scans together during logging
    scanId = UUID.randomUUID().toString();
    Map<byte [], NavigableSet<byte []>> familyMap = scan.getFamilyMap();
    boolean keyOnlyFilter = familyMap.isEmpty() && context.getWhereCoditionColumns().isEmpty();
    if (projector.isProjectEmptyKeyValue()) {
        // If nothing projected into scan and we only have one column family, just allow everything
        // to be projected and use a FirstKeyOnlyFilter to skip from row to row. This turns out to
        // be quite a bit faster.
        // Where condition columns also will get added into familyMap
        // When where conditions are present, we can not add FirstKeyOnlyFilter at beginning.
        if (familyMap.isEmpty() && context.getWhereCoditionColumns().isEmpty()
                && table.getColumnFamilies().size() == 1) {
            // Project the one column family. We must project a column family since it's possible
            // that there are other non declared column families that we need to ignore.
            scan.addFamily(table.getColumnFamilies().get(0).getName().getBytes());
        } else {
            byte[] ecf = SchemaUtil.getEmptyColumnFamily(table);
            // Project empty key value unless the column family containing it has
            // been projected in its entirety.
            if (!familyMap.containsKey(ecf) || familyMap.get(ecf) != null) {
                scan.addColumn(ecf, QueryConstants.EMPTY_COLUMN_BYTES);
            }
        }
    } else if (table.getViewType() == ViewType.MAPPED) {
        // Since we don't have the empty key value in MAPPED tables, we must select all CFs in HRS. But only the
        // selected column values are returned back to client
        for (PColumnFamily family : table.getColumnFamilies()) {
            scan.addFamily(family.getName().getBytes());
        }
    }
    // Add FirstKeyOnlyFilter if there are no references to key value columns
    if (keyOnlyFilter) {
        ScanUtil.andFilterAtBeginning(scan, new FirstKeyOnlyFilter());
    }
    
    // TODO adding all CFs here is not correct. It should be done only after ColumnProjectionOptimization.
    if (perScanLimit != null) {
        ScanUtil.andFilterAtEnd(scan, new PageFilter(perScanLimit));
    }

    doColumnProjectionOptimization(context, scan, table, statement);
    
    this.scans = getParallelScans();
    List<KeyRange> splitRanges = Lists.newArrayListWithExpectedSize(scans.size() * ESTIMATED_GUIDEPOSTS_PER_REGION);
    for (List<Scan> scanList : scans) {
        for (Scan aScan : scanList) {
            splitRanges.add(KeyRange.getKeyRange(aScan.getStartRow(), aScan.getStopRow()));
        }
    }
    this.splits = ImmutableList.copyOf(splitRanges);
    // If split detected, this will be more than one, but that's unlikely
    this.allFutures = Lists.newArrayListWithExpectedSize(1);
}
 
Example 17
/**
 * This method will produce an Apache Arrow Schema for the given TableName and HBase connection
 * by scanning up to the requested number of rows and using basic schema inference to determine
 * data types.
 *
 * @param client The HBase connection to use for the scan operation.
 * @param tableName The HBase TableName for which to produce an Apache Arrow Schema.
 * @param numToScan The number of records to scan as part of producing the Schema.
 * @return An Apache Arrow Schema representing the schema of the HBase table.
 */
public static Schema inferSchema(HBaseConnection client, TableName tableName, int numToScan)
{
    Scan scan = new Scan().setMaxResultSize(numToScan).setFilter(new PageFilter(numToScan));
    org.apache.hadoop.hbase.TableName hbaseTableName = org.apache.hadoop.hbase.TableName.valueOf(getQualifiedTableName(tableName));
    return client.scanTable(hbaseTableName, scan, (ResultScanner scanner) -> scanAndInferSchema(scanner));
}