| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.pig.data; |
| |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| import org.apache.pig.classification.InterfaceAudience; |
| import org.apache.pig.classification.InterfaceStability; |
| |
| /** |
| * Utility functions for estimating size of objects of pig types |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public class SizeUtil { |
| |
| private static final int MAP_MEM_PER_ENTRY = 32 + 120; |
| |
| public static long getPigObjMemSize(Object o) { |
| // 12 is added to each to account for the object overhead and the |
| // pointer in the tuple. |
| switch (DataType.findType(o)) { |
| case DataType.BYTEARRAY: { |
| byte[] bytes = ((DataByteArray) o).get(); |
| // bytearray size including rounding to 8 bytes |
| long byte_array_sz = roundToEight(bytes.length + 12); |
| |
| return byte_array_sz + 16 /* 16 is additional size of DataByteArray */; |
| } |
| |
| case DataType.CHARARRAY: { |
| String s = (String) o; |
| // See PIG-1443 for a reference for this formula |
| return roundToEight((s.length() * 2) + 38); |
| } |
| |
| case DataType.TUPLE: { |
| Tuple t = (Tuple) o; |
| return t.getMemorySize(); |
| } |
| |
| case DataType.BAG: { |
| DataBag b = (DataBag) o; |
| return b.getMemorySize(); |
| } |
| |
| case DataType.INTEGER: |
| return 4 + 8 + 4/* +4 to round to 8 bytes */; |
| |
| case DataType.LONG: |
| return 8 + 8; |
| |
| case DataType.DATETIME: |
| return 8 + 2 + 8 + 6 /* one long (8) + one short (2) + 6 to round to 8 bytes */; |
| |
| case DataType.MAP: { |
| @SuppressWarnings("unchecked") |
| Map<String, Object> m = (Map<String, Object>) o; |
| Iterator<Map.Entry<String, Object>> i = m.entrySet().iterator(); |
| long sum = 0; |
| while (i.hasNext()) { |
| Entry<String, Object> entry = i.next(); |
| sum += getMapEntrySize(entry.getKey(), entry.getValue()); |
| } |
| return sum; |
| } |
| |
| case DataType.FLOAT: |
| return 4 + 8 + 4/* +4 to round to 8 bytes */; |
| |
| case DataType.DOUBLE: |
| return 8 + 8; |
| |
| case DataType.BOOLEAN: |
| // boolean takes 1 byte , +7 to round it to 8 |
| return 1 + 8 + 7; |
| |
| //used http://javamoods.blogspot.fr/2009/03/how-big-is-bigdecimal.html as reference |
| case DataType.BIGINTEGER: |
| return 56; |
| |
| case DataType.BIGDECIMAL: |
| return 32; |
| |
| case DataType.NULL: |
| return 0; |
| |
| default: |
| // ?? |
| return 12; |
| } |
| } |
| |
| public static long getMapEntrySize(Object key, Object value) { |
| // based on experiments on 32 bit Java HotSpot VM |
| // size of map with 0 entries is 120 bytes |
| // each additional entry have around 24 bytes overhead at |
| // small number of entries. At larger number of entries, the |
| // overhead is around 32 bytes, probably because of the expanded |
| // data structures in anticapation of more entries being added |
| return getPigObjMemSize(key) + getPigObjMemSize(value) |
| + MAP_MEM_PER_ENTRY; |
| } |
| |
| /** |
| * Memory size of objects are rounded to multiple of 8 bytes |
| * |
| * @param i |
| * @return i rounded to a equal of higher multiple of 8 |
| */ |
| public static long roundToEight(long i) { |
| return 8 * ((i + 7) / 8); // integer division rounds the result down |
| } |
| |
| } |