af54c4092a
Summary: In block-based table builder, the cut-over from buffered to unbuffered mode involves sampling the buffered blocks and generating a dictionary. There was a bug where `SstFileWriter` passed zero as the `target_file_size` causing the cutover to happen immediately, so there were no samples available for generating the dictionary. This PR changes the meaning of `target_file_size == 0` to mean buffer the whole file before cutting over. It also adds dictionary compression support to `sst_dump --command=recompress` for easy evaluation. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7323 Reviewed By: cheng-chang Differential Revision: D23412158 Pulled By: ajkr fbshipit-source-id: 3b232050e70ef3c2ee85a4b5f6fadb139c569873