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W. J. van der Laan 58275db371
Merge bitcoin/bitcoin#23140: Make CAddrman::Select_ select buckets, not positions, first 
632aad9e6d Make CAddrman::Select_ select buckets, not positions, first (Pieter Wuille)

Pull request description:

  The original CAddrMan behaviour (before #5941) was to pick a uniformly random non-empty bucket, and then pick a random element from that bucket. That commit, which introduced deterministic placement of entries in buckets, changed this to picking a uniformly random non-empty bucket position instead.

  I believe that was a mistake. Buckets are our best metric for spreading out requests across independently-controlled nodes. That
  does mean that if a bucket has fewer entries, its entries are supposed to be picked more frequently.

  This PR reverts to the original high-level behavior, but on top of the deterministic placement logic.

ACKs for top commit:
  jnewbery:
    utACK 632aad9e6d
  naumenkogs:
    ACK 632aad9e6d
  mzumsande:
    ACK 632aad9e6d

Tree-SHA512: 60768afba2b6f0abd0dddff04381cab5acf374df48fc0e883ee16dde7cf7fd33056a04b573cff24a1b4d8e2a645bf0f0b3689eec84da4ff330e7b59ef142eca1
2021-10-22 13:55:05 +02:00
.github doc: Remove label from good first issue template 2020-08-24 09:31:24 +02:00
.tx qt: Bump transifex slug for 22.x 2021-04-21 13:46:41 +02:00
build-aux/m4 build: no-longer fail default configure if BDB isn't available 2021-10-05 11:38:28 +08:00
build_msvc Merge bitcoin/bitcoin#22890: doc: Replace a link to Qt precompiled binaries with compile instructions 2021-10-07 08:39:52 +08:00
ci ci: Disable syscall sandbox in valgrind functional tests 2021-10-20 21:06:10 +02:00
contrib Merge bitcoin/bitcoin#22646: build: tighter Univalue integration, remove --with-system-univalue 2021-10-20 11:01:38 +08:00
depends Merge bitcoin/bitcoin#22783: build: Cleanup depends build system 2021-10-19 15:51:41 +08:00
doc doc: Add note on deleting past-EOL release branches 2021-10-20 18:45:03 +02:00
share Remove -rescan startup parameter 2021-09-30 12:06:27 +13:00
src Merge bitcoin/bitcoin#23140: Make CAddrman::Select_ select buckets, not positions, first 2021-10-22 13:55:05 +02:00
test Merge bitcoin/bitcoin#23002: Make descriptor wallets by default 2021-10-22 13:31:10 +02:00
.cirrus.yml ci: Improve vcpkg binary cache settings 2021-10-20 22:16:12 +03:00
.editorconfig ci: Drop AppVeyor CI integration 2021-09-07 06:12:53 +03:00
.gitattributes Separate protocol versioning from clientversion 2014-10-29 00:24:40 -04:00
.gitignore build: add *~ to .gitignore 2021-05-12 18:10:47 +02:00
.python-version Bump minimum python version to 3.6 2020-11-09 17:53:47 +10:00
.style.yapf test: .style.yapf: Set column_limit=160 2019-03-04 18:28:13 -05:00
autogen.sh scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
configure.ac Merge bitcoin/bitcoin#23282: build: remove build stubs for external leveldb 2021-10-21 09:31:20 +08:00
CONTRIBUTING.md Enable TLS in links in documentation 2021-09-16 22:00:20 +00:00
COPYING doc: Update license year range to 2021 2020-12-30 16:24:47 +01:00
INSTALL.md doc: Added hyperlink for doc/build 2021-09-09 19:53:12 +05:30
libbitcoinconsensus.pc.in build: remove libcrypto as internal dependency in libbitcoinconsensus.pc 2019-11-19 15:03:44 +01:00
Makefile.am scripts: remove pixie.py 2021-10-12 08:36:21 +08:00
README.md doc: Rework internal and external links 2021-02-17 09:18:46 +01:00
REVIEWERS release: remove gitian 2021-08-31 09:37:23 +08:00
SECURITY.md doc: Remove explicit mention of version from SECURITY.md 2019-06-14 06:39:17 -04:00

README.md

Bitcoin Core integration/staging tree

https://bitcoincore.org

For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.

Further information about Bitcoin Core is available in the doc folder.

What is Bitcoin?

Bitcoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.

For more information read the original Bitcoin whitepaper.

License

Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.

Development Process

The master branch is regularly built (see doc/build-*.md for instructions) and tested, but it is not guaranteed to be completely stable. Tags are created regularly from release branches to indicate new official, stable release versions of Bitcoin Core.

The https://github.com/bitcoin-core/gui repository is used exclusively for the development of the GUI. Its master branch is identical in all monotree repositories. Release branches and tags do not exist, so please do not fork that repository unless it is for development reasons.

The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.

Testing

Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.

Automated Testing

Developers are strongly encouraged to write unit tests for new code, and to submit new unit tests for old code. Unit tests can be compiled and run (assuming they weren't disabled in configure) with: make check. Further details on running and extending unit tests can be found in /src/test/README.md.

There are also regression and integration tests, written in Python. These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py

The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.

Manual Quality Assurance (QA) Testing

Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.

Translations

Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.

Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.

Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.