Core Tor Team April 2017 Report:

We finished the remaining tasks related to the implemention of Proposal 140 [1], "Provide diffs between consensuses". * #21646 - Prop140/compression: Refactor "directory request" code [2] * #21647 - Prop140: directory caches cache multiple past diffs or consensuses [3] * #21869 - Labeled storage backend for consensus docs and diffs [4] * #21648 - Prop140: Caches generate diffs as appropriate [5] * #22096 - Increase MALLOC_MP_LIM in sandbox.c [6]

We continue to work on Proposal 278 [7], "Directory Compression Scheme Negotiation", finishing the following tasks:

* #21664 - Prop278: Make the current 'torgzip' module a submodule of a new 'compression' module [8] * #21662 - Prop278: Add support for LZMA2 and/or Zstandard [9] * #22066 - Add memory measurement code in LZMA and Zstandard compression backends [10] * #21665 - Prop278: Establish an upper-bound for LZMA2 memory usage [11] * #22051 - Use streaming compression API in the non-streaming compression API [12] * #21663 - Prop278: Refactor the torgzip module to support additional compression schemes [13] * #22065 - Prop278: Parse the Accept-Encoding header and pass it to "get" handlers [14] * #21667 - Prop278: Handle new headers in directory.c [15] * #22085 - Refactor and simplify compression tests [16]

We also hosted a follow-up meeting with Metrics Team regarding the impact of these efforts on the their work. Notes from this meeting can be found at: https://pad.riseup.net/p/chikeuBN1OUh

[1] https://gitweb.torproject.org/torspec.git/tree/proposals/140-consensus-diffs... [2] https://trac.torproject.org/projects/tor/ticket/21646 [3] https://trac.torproject.org/projects/tor/ticket/21647 [4] https://trac.torproject.org/projects/tor/ticket/21869 [5] https://trac.torproject.org/projects/tor/ticket/21648 [6] https://trac.torproject.org/projects/tor/ticket/22096 [7] https://gitweb.torproject.org/torspec.git/tree/proposals/278-directory-compr... [8] https://trac.torproject.org/projects/tor/ticket/21664 [9] https://trac.torproject.org/projects/tor/ticket/21662 [10] https://trac.torproject.org/projects/tor/ticket/22066 [11] https://trac.torproject.org/projects/tor/ticket/21665 [12] https://trac.torproject.org/projects/tor/ticket/22051 [13] https://trac.torproject.org/projects/tor/ticket/21663 [14] https://trac.torproject.org/projects/tor/ticket/22065 [15] https://trac.torproject.org/projects/tor/ticket/21667 [16] https://trac.torproject.org/projects/tor/ticket/22085