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From jackylk <>
Subject [GitHub] carbondata pull request #1059: [CARBONDATA-1124] Use raw compression while e...
Date Wed, 21 Jun 2017 05:10:02 GMT
Github user jackylk commented on a diff in the pull request:
    --- Diff: core/src/main/java/org/apache/carbondata/core/datastore/page/
    @@ -326,9 +327,17 @@ public void encode(PrimitiveCodec codec) {
    -  public byte[] compress(Compressor compressor) {
    -    // TODO: use zero-copy raw compression
    -    return super.compress(compressor);
    +  public byte[] compress(Compressor compressor) throws MemoryException, IOException {
    +    // use raw compression and copy to byte[]
    +    int inputSize = pageSize << dataType.getSizeBits();
    +    int compressedMaxSize = compressor.maxCompressedLength(inputSize);
    +    MemoryBlock compressed = UnsafeMemoryManager.allocateMemoryWithRetry(compressedMaxSize);
    --- End diff --
    I think it is better to change the logic in UnsafeMemoryManager to simplify the usage
code. In UnsafeMemoryManager, it will use unsafe memory based on
        boolean offHeap = Boolean.parseBoolean(CarbonProperties.getInstance()
    So I suggest to change this part to make one configuration only for unsafe. Then I will
remove other unsafe configuration like ENABLE_UNSAFE_COLUMN_PAGE_LOADING
    @ravipesala please check

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