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From ravipesala <...@git.apache.org>
Subject [GitHub] carbondata pull request #1185: [WIP]Fixed Concurrent table data loading unsa...
Date Wed, 19 Jul 2017 12:13:16 GMT
Github user ravipesala commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1185#discussion_r128228002
  
    --- Diff: core/src/main/java/org/apache/carbondata/core/memory/UnsafeSortMemoryManager.java
---
    @@ -0,0 +1,216 @@
    +/*
    + * 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.carbondata.core.memory;
    +
    +import java.util.HashMap;
    +import java.util.HashSet;
    +import java.util.Iterator;
    +import java.util.Map;
    +import java.util.Set;
    +
    +import org.apache.carbondata.common.logging.LogService;
    +import org.apache.carbondata.common.logging.LogServiceFactory;
    +import org.apache.carbondata.core.constants.CarbonCommonConstants;
    +import org.apache.carbondata.core.util.CarbonProperties;
    +
    +/**
    + * Memory manager to keep track of
    + * all memory for storing the sorted data
    + */
    +public class UnsafeSortMemoryManager {
    +
    +  /**
    +   * logger
    +   */
    +  private static final LogService LOGGER =
    +      LogServiceFactory.getLogService(UnsafeSortMemoryManager.class.getName());
    +
    +  /**
    +   * offheap is enabled
    +   */
    +  private static boolean offHeap = Boolean.parseBoolean(CarbonProperties.getInstance()
    +      .getProperty(CarbonCommonConstants.ENABLE_OFFHEAP_SORT,
    +          CarbonCommonConstants.ENABLE_OFFHEAP_SORT_DEFAULT));
    +
    +  /**
    +   * map to keep taskid to memory blocks
    +   */
    +  private static Map<Long, Set<MemoryBlock>> taskIdToMemoryBlockMap;
    +
    +  /**
    +   * singleton instance
    +   */
    +  public static final UnsafeSortMemoryManager INSTANCE;
    +
    +  /**
    +   * total memory available for sort data storage
    +   */
    +  private long totalMemory;
    +
    +  /**
    +   * current memory used
    +   */
    +  private long memoryUsed;
    +
    +  /**
    +   * current memory allocator
    +   */
    +  private MemoryAllocator allocator;
    +
    +  static {
    +    long size;
    +    try {
    +      size = Long.parseLong(CarbonProperties.getInstance()
    +          .getProperty(CarbonCommonConstants.IN_MEMORY_FOR_SORT_DATA_IN_MB,
    +              CarbonCommonConstants.IN_MEMORY_FOR_SORT_DATA_IN_MB_DEFAULT));
    +    } catch (Exception e) {
    +      size = Long.parseLong(CarbonCommonConstants.IN_MEMORY_FOR_SORT_DATA_IN_MB_DEFAULT);
    +      LOGGER.info("Wrong memory size given, " + "so setting default value to " + size);
    +    }
    +    if (size < 1024) {
    +      size = 1024;
    +      LOGGER.info("It is not recommended to keep unsafe memory size less than 1024MB,
"
    +          + "so setting default value to " + size);
    +    }
    +
    +    long takenSize = size * 1024 * 1024;
    +    MemoryAllocator allocator;
    +    if (offHeap) {
    +      allocator = MemoryAllocator.UNSAFE;
    +    } else {
    +      long maxMemory = Runtime.getRuntime().maxMemory() * 60 / 100;
    +      if (takenSize > maxMemory) {
    +        takenSize = maxMemory;
    +      }
    +      allocator = MemoryAllocator.HEAP;
    +    }
    +    INSTANCE = new UnsafeSortMemoryManager(takenSize, allocator);
    +    taskIdToMemoryBlockMap = new HashMap<>();
    +  }
    +
    +  private UnsafeSortMemoryManager(long totalMemory, MemoryAllocator allocator) {
    +    this.totalMemory = totalMemory;
    +    this.allocator = allocator;
    +    LOGGER.info("Sort Memory manager is created with size " + totalMemory + " with "
+ allocator);
    +  }
    +
    +  /**
    +   * Below method will be used to check whether memory required is
    +   * available or not
    +   *
    +   * @param required
    +   * @return if memory available
    +   */
    +  public synchronized boolean isMemoryAvailable(long required) {
    +    return memoryUsed + required < totalMemory;
    +  }
    +
    +  /**
    +   * Below method will be used to allocate dummy memory
    +   * this will be used to allocate first and then used when u need
    +   *
    +   * @param size
    +   */
    +  public synchronized void allocateDummyMemory(long size) {
    +    memoryUsed += size;
    +  }
    +
    +  /**
    +   * Get total memory available
    +   *
    +   * @return amount of memory available
    +   */
    +  public long getUsableMemory() {
    +    return totalMemory;
    +  }
    +
    +  public synchronized void freeMemory(long taskId, MemoryBlock memoryBlock) {
    --- End diff --
    
    Please add log


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