Github user interma commented on a diff in the pull request:

    https://github.com/apache/incubator-hawq/pull/1274#discussion_r131583257
  
    --- Diff: depends/libhdfs3/src/client/CryptoCodec.cpp ---
    @@ -119,33 +119,38 @@ namespace Hdfs {
                        return -1;
                }
     
    -           //calculate new IV when appending a existed file
    +           // Calculate iv and counter in order to init cipher context 
with cipher method. Default value is 0.
    +           resetStreamOffset(crypto_method, stream_offset);
    +
    +           LOG(DEBUG3, "CryptoCodec init success, length of the decrypted 
key is : %llu, crypto method is : %d", AlgorithmBlockSize, crypto_method);
    +           is_init = true;
    +           return 1;
    +
    +   }
    +
    +   int CryptoCodec::resetStreamOffset(CryptoMethod crypto_method, int64_t 
stream_offset) {
    +           // Calculate new IV when appending an existed file.
    --- End diff --
    
    check `is_init`: if not initialized yet, return -1


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