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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/04/21 18:37:54 UTC

[GitHub] [arrow] andersonm-ibm commented on pull request #12778: ARROW-14114: [C++][Parquet] Fix multi-threaded read of PME files

andersonm-ibm commented on PR #12778:
URL: https://github.com/apache/arrow/pull/12778#issuecomment-1105621663

   > Can you explain what is being accessed from multiple threads in this context?
   
   `AesDecryptor::AesDecryptorImpl::GcmDecrypt()` and `AesDecryptor::AesDecryptorImpl::CtrDecrypt()` use `ctx_` member of type `EVP_CIPHER_CTX` from OpenSSL, which shouldn't be used from multiple threads concurrently. 
   So, instead of sharing the same `AesDecryptor` between all `Decryptors`, an `AesDecryptor` will be created per `Decryptor`, which is per column.


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