Method Compress

be/src/util/runtime-profile-serialization.cc:35–60

namespace impala {

Status RuntimeProfile::Compress(vector<uint8_t>* out) const {
  Status status;
  TRuntimeProfileTree thrift_object;
  const_cast<RuntimeProfile*>(this)->ToThrift(&thrift_object);
  ThriftSerializer serializer(true);
  vector<uint8_t> serialized_buffer;
  RETURN_IF_ERROR(serializer.SerializeToVector(&thrift_object, &serialized_buffer));

  // Compress the serialized thrift string.  This uses string keys and is very
  // easy to compress.
  scoped_ptr<Codec> compressor;
  Codec::CodecInfo codec_info(THdfsCompression::DEFAULT);
  RETURN_IF_ERROR(Codec::CreateCompressor(NULL, false, codec_info, &compressor));
  const auto close_compressor =
      MakeScopeExitTrigger([&compressor]() { compressor->Close(); });

  int64_t max_compressed_size = compressor->MaxOutputLen(serialized_buffer.size());
  DCHECK_GT(max_compressed_size, 0);
  out->resize(max_compressed_size);
  int64_t result_len = out->size();
  uint8_t* compressed_buffer_ptr = out->data();
  RETURN_IF_ERROR(compressor->ProcessBlock(true, serialized_buffer.size(),
      serialized_buffer.data(), &result_len, &compressed_buffer_ptr));
  out->resize(result_len);
  return Status::OK();
}

Status RuntimeProfile::SerializeToArchiveString(string* out) const {
  stringstream ss;