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From jackylk <...@git.apache.org>
Subject [GitHub] carbondata pull request #1000: [CARBONDATA-1018] Add unsafe ColumnPage imple...
Date Wed, 14 Jun 2017 12:53:50 GMT
Github user jackylk commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1000#discussion_r121937162
  
    --- Diff: core/src/main/java/org/apache/carbondata/core/datastore/page/UnsafeVarLengthColumnPage.java
---
    @@ -0,0 +1,150 @@
    +/*
    + * 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.datastore.page;
    +
    +import java.math.BigDecimal;
    +
    +import org.apache.carbondata.core.memory.CarbonUnsafe;
    +import org.apache.carbondata.core.memory.MemoryBlock;
    +import org.apache.carbondata.core.memory.MemoryException;
    +import org.apache.carbondata.core.memory.UnsafeMemoryManager;
    +import org.apache.carbondata.core.metadata.datatype.DataType;
    +import org.apache.carbondata.core.util.DataTypeUtil;
    +
    +// This extension uses unsafe memory to store page data, for variable length data type
(string,
    +// decimal)
    +public class UnsafeVarLengthColumnPage extends VarLengthColumnPageBase {
    +
    +  // memory allocated by Unsafe
    +  private MemoryBlock memoryBlock;
    +
    +  // base address of memoryBlock
    +  private Object baseAddress;
    +
    +  // base offset of memoryBlock
    +  private long baseOffset;
    +
    +  // size of the allocated memory, in bytes
    +  private int capacity;
    +
    +  // default size for each row, grows as needed
    +  private static final int DEFAULT_ROW_SIZE = 8;
    +
    +  UnsafeVarLengthColumnPage(DataType dataType, int pageSize) throws MemoryException {
    +    super(dataType, pageSize);
    +    capacity = pageSize * DEFAULT_ROW_SIZE;
    +    memoryBlock = UnsafeMemoryManager.allocateMemoryWithRetry(capacity);
    +    baseAddress = memoryBlock.getBaseObject();
    +    baseOffset = memoryBlock.getBaseOffset();
    +    rowOffset = new int[pageSize];
    +    totolLength = 0;
    +  }
    +
    +  @Override
    +  public void freeMemory() {
    +    if (memoryBlock != null) {
    +      UnsafeMemoryManager.INSTANCE.freeMemory(memoryBlock);
    +    }
    +  }
    +
    +  private void ensureMemory(int requestSize) throws MemoryException {
    +    if (totolLength + requestSize > capacity) {
    +      memoryBlock = UnsafeMemoryManager.reallocateMemoryWithRetry(memoryBlock, requestSize);
    +    }
    +  }
    +
    +  @Override
    +  public void putBytes(int rowId, byte[] bytes) {
    +    int offset;
    +    if (rowId == 0) {
    +      offset = 0;
    +    } else {
    +      offset = rowOffset[rowId - 1];
    +    }
    +
    +    try {
    +      ensureMemory(bytes.length);
    +    } catch (MemoryException e) {
    +      throw new RuntimeException(e);
    +    }
    +
    +    for (int i = 0; i < bytes.length; i++) {
    +      CarbonUnsafe.unsafe.putByte(baseAddress, baseOffset + offset + i, bytes[i]);
    +    }
    +    rowOffset[rowId] = offset + bytes.length + 4;
    +    totolLength += bytes.length;
    +  }
    +
    +  @Override
    +  public void putBytes(int rowId, byte[] bytes, int offset, int length) {
    +    int currentRowOffset = rowOffset[rowId];
    +    for (int i = 0; i < length; i++) {
    +      CarbonUnsafe.unsafe.putByte(baseAddress, baseOffset + currentRowOffset + i, bytes[i]);
    +    }
    +  }
    +
    +  @Override
    +  public BigDecimal getDecimal(int rowId) {
    +    int offset, length;
    +    if (rowId == 0) {
    +      length = rowOffset[rowId];
    +      offset = 0;
    +    } else {
    +      length = rowOffset[rowId] - rowOffset[rowId - 1];
    +      offset = rowOffset[rowId - 1];
    +    }
    +
    +    byte[] bytes = new byte[length];
    +    for (int i = 0; i < length; i++) {
    +      bytes[i] = CarbonUnsafe.unsafe.getByte(baseAddress, baseOffset + offset + i);
    +    }
    +
    +    return DataTypeUtil.byteToBigDecimal(bytes);
    +  }
    +
    +  @Override
    +  public byte[][] getByteArrayPage() {
    +    byte[][] bytes = new byte[pageSize][];
    +    for (int rowId = 0; rowId < pageSize; rowId++) {
    +      int offset, length;
    +      if (rowId == 0) {
    +        length = rowOffset[rowId] - 4;
    +        offset = 0;
    +      } else {
    +        length = rowOffset[rowId] - rowOffset[rowId - 1] - 4;
    +        offset = rowOffset[rowId - 1];
    +      }
    +      byte[] rowData = new byte[length];
    +      for (int j = 0; j < length; j++) {
    +        rowData[j] = CarbonUnsafe.unsafe.getByte(baseAddress, baseOffset + offset + j);
    --- End diff --
    
    ok


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