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sparse-revlog: new requirement enabled with format.sparse-revlog The meaning of the new 'sparse-revlog' requirement is that the revlogs are allowed to contain wider delta chains with larger holes between the interesting chunks. These sparse delta chains should be read in several chunks to avoid a potential explosion of memory usage. Former version won't know how to read a delta chain in several chunks. They would keep reading them in a single read, and therefore would be subject to the potential memory explosion. Hence this new requirement: only versions having support of sparse-revlog reading should be allowed to read such a revlog. Implementation of this new algorithm and tools to enable or disable the requirement will follow in the next changesets.
author Paul Morelle <paul.morelle@octobus.net>
date Mon, 04 Jun 2018 22:23:18 +0200
parents a492610a2fc1
children
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Augie Fackler <augie@google.com>
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1 Our full contribution guidelines are in our wiki, please see:
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2
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3 https://www.mercurial-scm.org/wiki/ContributingChanges
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4
a492610a2fc1 contributing: add new file with a pointer to the wiki
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5 If you just want a checklist to follow, you can go straight to
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6
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7 https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
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8
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9 If you can't run the entire testsuite for some reason (it can be
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10 difficult on Windows), please at least run `contrib/check-code.py` on
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11 any files you've modified and run `python contrib/check-commit` on any
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12 commits you've made (for example, `python contrib/check-commit
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13 273ce12ad8f1` will report some style violations on a very old commit).