Java Code Examples for org.rocksdb.RocksIterator#close()

@Override
public void iterate(byte[] from, EntryConsumer consumer)
    throws IOException {
  RocksIterator it = null;
  try {
    it = db.newIterator();
    if (from != null) {
      it.seek(from);
    } else {
      it.seekToFirst();
    }
    while (it.isValid()) {
      if (!consumer.consume(it.key(), it.value())) {
        break;
      }
      it.next();
    }
  } finally {
    if (it != null) {
      it.close();
    }
  }
}
 

@Override
public long getFirstLogIndex() {
    this.readLock.lock();
    RocksIterator it = null;
    try {
        if (this.hasLoadFirstLogIndex) {
            return this.firstLogIndex;
        }
        checkState();
        it = this.db.newIterator(this.defaultHandle, this.totalOrderReadOptions);
        it.seekToFirst();
        if (it.isValid()) {
            final long ret = Bits.getLong(it.key(), 0);
            saveFirstLogIndex(ret);
            setFirstLogIndex(ret);
            return ret;
        }
        return 1L;
    } finally {
        if (it != null) {
            it.close();
        }
        this.readLock.unlock();
    }
}
 

@Override
public boolean isEmpty() throws IOException {
  RocksIterator it = null;
  try {
    it = db.newIterator();
    it.seekToFirst();
    return !it.isValid();
  } finally {
    if (it != null) {
      it.close();
    }
  }
}
 

@Override
public ImmutablePair<byte[], byte[]> peekAround(int offset,
    byte[] from) throws IOException, IllegalArgumentException {
  RocksIterator it = null;
  try {
    it = db.newIterator();
    if (from == null) {
      it.seekToFirst();
    } else {
      it.seek(from);
    }
    if (!it.isValid()) {
      return null;
    }

    switch (offset) {
    case 0:
      break;
    case 1:
      it.next();
      break;
    case -1:
      it.prev();
      break;
    default:
      throw new IllegalArgumentException(
          "Position can only be -1, 0 " + "or 1, but found " + offset);
    }
    return it.isValid() ? new ImmutablePair<>(it.key(), it.value()) : null;
  } finally {
    if (it != null) {
      it.close();
    }
  }
}
 

@Override
public Iterator<String[]> iterator() {
    final RocksIterator rocksIterator = getRocksIterator();
    rocksIterator.seekToFirst();

    return new Iterator<String[]>() {
        int counter;

        @Override
        public boolean hasNext() {
            boolean valid = rocksIterator.isValid();
            if (!valid) {
                rocksIterator.close();
            }
            return valid;
        }

        @Override
        public String[] next() {
            counter++;
            if (counter % 100000 == 0) {
                logger.info("scanned {} rows from rocksDB", counter);
            }
            String[] result = rowEncoder.decode(new KV(rocksIterator.key(), rocksIterator.value()));
            rocksIterator.next();
            return result;
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException("not support operation");
        }
    };
}
 

/**
 * Perform a prefix delete and return stream of key-value pairs retrieved.
 *
 * @param columnFamilyName Column Family Name
 * @param prefix Prefix Key
 * @param <T> Type of value stored
 */
public <T extends Serializable> void prefixDelete(String columnFamilyName, String prefix) {
  ValidationUtils.checkArgument(!closed);
  LOG.info("Prefix DELETE (query=" + prefix + ") on " + columnFamilyName);
  final RocksIterator it = getRocksDB().newIterator(managedHandlesMap.get(columnFamilyName));
  it.seek(prefix.getBytes());
  // Find first and last keys to be deleted
  String firstEntry = null;
  String lastEntry = null;
  while (it.isValid() && new String(it.key()).startsWith(prefix)) {
    String result = new String(it.key());
    it.next();
    if (firstEntry == null) {
      firstEntry = result;
    }
    lastEntry = result;
  }
  it.close();

  if (null != firstEntry) {
    try {
      // This will not delete the last entry
      getRocksDB().deleteRange(managedHandlesMap.get(columnFamilyName), firstEntry.getBytes(), lastEntry.getBytes());
      // Delete the last entry
      getRocksDB().delete(lastEntry.getBytes());
    } catch (RocksDBException e) {
      LOG.error("Got exception performing range delete");
      throw new HoodieException(e);
    }
  }
}
 

@Override
public MappingIterator mappingIterator() {
  RocksIterator rocksIterator = indices.newIterator();
  return new MappingIterator() {
    @Override
    public void close() {
      rocksIterator.close();
    }

    @Override
    public boolean isValid() {
      return rocksIterator.isValid();
    }

    @Override
    public int identifier() {
      byte[] value = rocksIterator.value();
      return ByteBuffer.wrap(value).getInt();
    }

    @Override
    public String string() {
      byte[] key = rocksIterator.key();
      return new String(key, StandardCharsets.UTF_8);
    }

    @Override
    public void next() {
      rocksIterator.next();
    }
  };
}
 

@Override
public MappingIterator mappingIterator() {
  RocksIterator rocksIterator = terms.newIterator();
  rocksIterator.seekToFirst();
  return new MappingIterator() {
    @Override
    public boolean isValid() {
      return rocksIterator.isValid();
    }

    @Override
    public int identifier() {
      byte[] key = rocksIterator.key();
      return ByteBuffer.wrap(key).getInt();
    }

    @Override
    public String string() {
      byte[] value = rocksIterator.value();
      return new String(value, StandardCharsets.UTF_8);
    }

    @Override
    public void next() {
      rocksIterator.next();
    }

    @Override
    public void close() {
      rocksIterator.close();
    }
  };
}
 

@Override
public Iterator<String[]> iterator() {
    final RocksIterator rocksIterator = getRocksIterator();
    rocksIterator.seekToFirst();

    return new Iterator<String[]>() {
        int counter;

        @Override
        public boolean hasNext() {
            boolean valid = rocksIterator.isValid();
            if (!valid) {
                rocksIterator.close();
            }
            return valid;
        }

        @Override
        public String[] next() {
            counter++;
            if (counter % 100000 == 0) {
                logger.info("scanned {} rows from rocksDB", counter);
            }
            String[] result = rowEncoder.decode(new KV(rocksIterator.key(), rocksIterator.value()));
            rocksIterator.next();
            return result;
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException("not support operation");
        }
    };
}
 

/**
 * Clear the array storage
 */
@Override
public void clear() {
    RocksIterator iterator = db.newIterator();
    while (iterator.isValid())
        try {
            db.remove(iterator.key());
        } catch (RocksDBException e) {
            throw new RuntimeException(e);
        }
    iterator.close();
    size = 0;
}
 

/**
 * Clear the array storage
 */
@Override
public void clear() {
    RocksIterator iterator = db.newIterator();
    while (iterator.isValid())
        try {
            db.remove(iterator.key());
        } catch (RocksDBException e) {
            throw new RuntimeException(e);
        }
    iterator.close();
    size = 0;
}
 

private List<Map.Entry<byte[], byte[]>> getRangeKVs(byte[] startKey,
    int count, boolean sequential,
    MetadataKeyFilters.MetadataKeyFilter... filters)
    throws IOException, IllegalArgumentException {
  List<Map.Entry<byte[], byte[]>> result = new ArrayList<>();
  long start = System.currentTimeMillis();
  if (count < 0) {
    throw new IllegalArgumentException(
        "Invalid count given " + count + ", count must be greater than 0");
  }
  RocksIterator it = null;
  try {
    it = db.newIterator();
    if (startKey == null) {
      it.seekToFirst();
    } else {
      if(get(startKey) == null) {
        // Key not found, return empty list
        return result;
      }
      it.seek(startKey);
    }
    while(it.isValid() && result.size() < count) {
      byte[] currentKey = it.key();
      byte[] currentValue = it.value();

      it.prev();
      final byte[] prevKey = it.isValid() ? it.key() : null;

      it.seek(currentKey);
      it.next();
      final byte[] nextKey = it.isValid() ? it.key() : null;

      if (filters == null) {
        result.add(new AbstractMap.SimpleImmutableEntry<>(currentKey,
            currentValue));
      } else {
        if (Arrays.asList(filters).stream()
            .allMatch(entry -> entry.filterKey(prevKey,
                currentKey, nextKey))) {
          result.add(new AbstractMap.SimpleImmutableEntry<>(currentKey,
              currentValue));
        } else {
          if (result.size() > 0 && sequential) {
            // if the caller asks for a sequential range of results,
            // and we met a dis-match, abort iteration from here.
            // if result is empty, we continue to look for the first match.
            break;
          }
        }
      }
    }
  } finally {
    if (it != null) {
      it.close();
    }
    long end = System.currentTimeMillis();
    long timeConsumed = end - start;
    if (LOG.isDebugEnabled()) {
      if (filters != null) {
        for (MetadataKeyFilters.MetadataKeyFilter filter : filters) {
          int scanned = filter.getKeysScannedNum();
          int hinted = filter.getKeysHintedNum();
          if (scanned > 0 || hinted > 0) {
            LOG.debug(
                "getRangeKVs ({}) numOfKeysScanned={}, numOfKeysHinted={}",
                filter.getClass().getSimpleName(), filter.getKeysScannedNum(),
                filter.getKeysHintedNum());
          }
        }
      }
      LOG.debug("Time consumed for getRangeKVs() is {}ms,"
          + " result length is {}.", timeConsumed, result.size());
    }
  }
  return result;
}
 

@Test
    public void testDeleteRange() {
        init();
        WriteBatch wb = new WriteBatch();
        ColumnFamilyHandle cfHandle = CFManager.CFH_DEFAULT;

        long st = System.currentTimeMillis();
        for(int i=100000; i<200000; i++) {
            wb.put(cfHandle, ("1324356527-" + i + "-5-5-345-356-234-232").getBytes(), "tasdfasdgasdfestfordb".getBytes());

            if(i % 30 == 0) {
                RDB.writeAsync(wb);
                wb.clear();
            }
        }
        for(int i=100000; i<200000; i++) {
            wb.put(cfHandle, ("1324356525-" + i + "-5-5-345-356-234-232").getBytes(), "tasdfasdgasdfestfordb".getBytes());

            if(i % 30 == 0) {
                RDB.writeAsync(wb);
                wb.clear();
            }
        }
        for(int i=100000; i<200000; i++) {
            wb.put(cfHandle, ("1324356529-" + i + "-5-5-345-356-234-232").getBytes(), "tasdfasdgasdfestfordb".getBytes());

            if(i % 30 == 0) {
                RDB.writeAsync(wb);
                wb.clear();
            }
        }
        RDB.writeAsync(wb);

        long ed = System.currentTimeMillis();
        System.out.println("write cost :" + (ed - st));

        try {
            TimeUnit.SECONDS.sleep(2);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        long start = System.currentTimeMillis();
        RocksIterator it = RDB.newIterator(cfHandle);
        byte[] now = "1324356527".getBytes();
        long count = 0;
        for(it.seek(now); it.isValid(); it.next()) {
//            System.out.println(new String(it.key()) + " " + new String(it.value()));
            count++;
            if(count == 100000)
                break;
        }
        it.close();
        long end = System.currentTimeMillis();
        System.out.println("cost : " + (end - start) + " count:" +count);
        RDB.deleteFilesInRange(CFManager.CFH_DEFAULT, "132435653".getBytes(), "1324356529".getBytes());

        count = 0;
        it = RDB.newIterator(cfHandle);
        now = "1324356525".getBytes();
        for(it.seek(now); it.isValid(); it.next()) {
//            System.out.println(new String(it.key()) + " " + new String(it.value()));
            count++;
            if(count == 100000)
                break;
        }
        it.close();
        end = System.currentTimeMillis();
        System.out.println("cost : " + (end - start) + " count:" +count);

        destructor();
    }
 

@Test
    public void testDeleteRange() {
        init();
        WriteBatch wb = new WriteBatch();
        ColumnFamilyHandle cfHandle = CFManager.CFH_DEFAULT;

        long st = System.currentTimeMillis();
        for(int i=100000; i<200000; i++) {
            wb.put(cfHandle, ("1324356527-" + i + "-5-5-345-356-234-232").getBytes(), "tasdfasdgasdfestfordb".getBytes());

            if(i % 30 == 0) {
                RDB.writeAsync(wb);
                wb.clear();
            }
        }
        for(int i=100000; i<200000; i++) {
            wb.put(cfHandle, ("1324356525-" + i + "-5-5-345-356-234-232").getBytes(), "tasdfasdgasdfestfordb".getBytes());

            if(i % 30 == 0) {
                RDB.writeAsync(wb);
                wb.clear();
            }
        }
        for(int i=100000; i<200000; i++) {
            wb.put(cfHandle, ("1324356529-" + i + "-5-5-345-356-234-232").getBytes(), "tasdfasdgasdfestfordb".getBytes());

            if(i % 30 == 0) {
                RDB.writeAsync(wb);
                wb.clear();
            }
        }
        RDB.writeAsync(wb);

        long ed = System.currentTimeMillis();
        System.out.println("write cost :" + (ed - st));

        try {
            TimeUnit.SECONDS.sleep(2);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        long start = System.currentTimeMillis();
        RocksIterator it = RDB.newIterator(cfHandle);
        byte[] now = "1324356527".getBytes();
        long count = 0;
        for(it.seek(now); it.isValid(); it.next()) {
//            System.out.println(new String(it.key()) + " " + new String(it.value()));
            count++;
            if(count == 100000)
                break;
        }
        it.close();
        long end = System.currentTimeMillis();
        System.out.println("cost : " + (end - start) + " count:" +count);
        RDB.deleteFilesInRange(CFManager.CFH_DEFAULT, "132435653".getBytes(), "1324356529".getBytes());

        count = 0;
        it = RDB.newIterator(cfHandle);
        now = "1324356525".getBytes();
        for(it.seek(now); it.isValid(); it.next()) {
//            System.out.println(new String(it.key()) + " " + new String(it.value()));
            count++;
            if(count == 100000)
                break;
        }
        it.close();
        end = System.currentTimeMillis();
        System.out.println("cost : " + (end - start) + " count:" +count);

        destructor();
    }
 

@Override
public Set<String> senses() {
  return new AbstractSet<String>() {
    @Override
    public Iterator<String> iterator() {
      RocksIterator rocksIterator = rocksDB.newIterator();
      rocksIterator.seekToFirst();
      return new Iterator<String>() {
        boolean closed = false;

        @Override
        public boolean hasNext() {
          return closed || rocksIterator.isValid();
        }

        @Override
        public String next() {
          if (!rocksIterator.isValid()) {
            throw new NoSuchElementException();
          }
          String sense = new String(rocksIterator.key(), StandardCharsets.UTF_8);
          rocksIterator.next();
          if (!rocksIterator.isValid()) {
            closed = true;
            rocksIterator.close();
          }
          return sense;
        }

        @Override
        protected void finalize() {
          if (!closed) {
            rocksIterator.close();
          }
        }
      };
    }

    @Override
    public boolean contains(Object o) {
      return o != null && o instanceof String && containsSense((String) o);
    }

    @Override
    public int size() {
      return RocksDBSenseVectors.this.size();
    }
  };
}
 

@Override
public Collection<SparseVector> vectors() {
  return new AbstractCollection<SparseVector>() {
    @Override
    public Iterator<SparseVector> iterator() {
      RocksIterator rocksIterator = rocksDB.newIterator();
      rocksIterator.seekToFirst();
      return new Iterator<SparseVector>() {
        boolean closed = false;

        @Override
        public boolean hasNext() {
          return closed || rocksIterator.isValid();
        }

        @Override
        public SparseVector next() {
          if (!rocksIterator.isValid()) {
            throw new NoSuchElementException();
          }
          SparseVector sparseVector = new SparseVector(rocksIterator.value());
          rocksIterator.next();
          if (!rocksIterator.isValid()) {
            closed = true;
            rocksIterator.close();
          }
          return sparseVector;
        }

        @Override
        protected void finalize() {
          if (!closed) {
            rocksIterator.close();
          }
        }
      };
    }

    @Override
    public int size() {
      return RocksDBSenseVectors.this.size();
    }
  };
}