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Wladimir J. van der Laan 011fe009f9
Merge #17994: validation: flush undo files after last block write 
ac94141af0 validation: delay flushing undo files in syncing node case (Karl-Johan Alm)

Pull request description:

  Fixes #17890. Replaces #17892.

  Data files (`{blk|rev}<number>.dat`) pre-allocate space as they are written, and then trims down to the final size once they move on to the next sequence ("finalized flush"). The code currently assumes (incorrectly) that blk and rev files finish at the same time, but because blk files are written as blocks come in, and rev files are written in block height order, rev files end up being written to for awhile after moving on to the next block file, resulting in pre-allocation and waste of up to 1 MB of space per rev file.

  The exact point at which rev file writing finishes is the highest height block found inside the corresponding block file, which is already available in the CBlockFileInfo vector. This PR moves finalized flushing of undo files to to directly after the undo data for the previous block file has been written.

  There is a branch with annotation that demonstrates how this is handling flushing here: https://github.com/kallewoof/bitcoin/tree/200124-rev-files-annotated

ACKs for top commit:
  vasild:
    ACK ac94141af (no changes in the code since ed34e00da).
  fjahr:
    Code review re-ACK ac94141af0
  jonatack:
    Code review ACK ac94141af0

Tree-SHA512: 1d4e3b3d1d99bd7ebe7a2f632b1231146dd4f9f993c54db3a4090d9c086d95d2e4c327fd936066392b3afc6277b8f3a908d5c5993d4c8e49f72b92a417716dd2
2020-06-04 16:39:06 +02:00
.github doc: Explain that anyone can work on good first issues, move text to CONTRIBUTING.md 2020-05-28 11:59:20 -04:00
.tx tx: Bump transifex slug to 020x 2020-03-16 10:52:55 +01:00
build-aux/m4 Update ax_cxx_compile_stdcxx.m4 2020-04-11 02:15:20 -07:00
build_msvc build: remove fdelt_chk backwards compatibility code 2020-05-07 15:44:56 +08:00
ci Merge #18210: test: type hints in Python tests 2020-06-03 22:19:52 +08:00
contrib test: Make valgrind.supp work on aarch64 2020-06-03 10:58:27 -04:00
depends Merge #18820: build: Propagate well-known vars into depends 2020-05-30 11:15:10 +08:00
doc doc: Move 0.21 fragments into the main release notes 2020-06-02 19:09:39 -04:00
share Merge #18616: refactor: Cleanup clientversion.cpp 2020-05-13 20:14:51 +02:00
src Merge #17994: validation: flush undo files after last block write 2020-06-04 16:39:06 +02:00
test Merge #19131: refactor: Fix unreachable code in init arg checks 2020-06-04 16:27:53 +02:00
.appveyor.yml Merge #18640: appveyor: Remove clcache 2020-04-15 16:19:52 -04:00
.cirrus.yml cirrus: Remove no longer needed install step 2020-05-30 08:32:29 -04:00
.fuzzbuzz.yml ci: Add fuzzbuzz integration 2020-04-14 16:38:26 +00:00
.gitattributes Separate protocol versioning from clientversion 2014-10-29 00:24:40 -04:00
.gitignore This PR adds initial support for type hints checking in python scripts. 2020-06-02 08:03:02 +02:00
.python-version .python-version: Specify full version 3.5.6 2019-03-02 12:06:26 -05:00
.style.yapf test: .style.yapf: Set column_limit=160 2019-03-04 18:28:13 -05:00
.travis.yml ci: Use libc++ instead of libstdc++ for tsan 2020-05-30 08:33:02 -04:00
autogen.sh scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
configure.ac Merge #19131: refactor: Fix unreachable code in init arg checks 2020-06-04 16:27:53 +02:00
CONTRIBUTING.md doc: Explain that anyone can work on good first issues, move text to CONTRIBUTING.md 2020-05-28 11:59:20 -04:00
COPYING doc: Update license year range to 2020 2019-12-26 23:11:21 +01:00
INSTALL.md Update INSTALL landing redirection notice for build instructions. 2016-10-06 12:27:23 +13:00
libbitcoinconsensus.pc.in build: remove libcrypto as internal dependency in libbitcoinconsensus.pc 2019-11-19 15:03:44 +01:00
Makefile.am gui: update Qt base translations for macOS release 2020-05-23 18:22:29 +08:00
README.md Adding build instructions to Bitcoin Core, fixes #18658 2020-04-16 21:01:00 -07:00
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

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, as well as an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/, or read the original 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 is not guaranteed to be completely stable. Tags are created regularly to indicate new official, stable release versions of Bitcoin Core.

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, that are run automatically on the build server. These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py

The Travis CI system makes 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.

Translators should also subscribe to the mailing list.