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comparison mercurial/revlogutils/constants.py @ 47234:616b8f412676

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revlogv2: introduce a very basic docket file This is the first stone toward using a docket file in revlogv2. Right now the docket is very basic and only store the version number (which is -also- stored into the index file?) and the other files have fixed name. This new implementation break transactionally? but they are no test checking transactionally for revlogv2? So I take this as an opportunity to start small. They are no usage of revlogv2 outside of tests anyway. The docket keeps the `.i` naming used by previous version index to preserve a unique entry point. We could decide to use a different name and look it up first, or to fully rework this in a future "store" version. However that does not seems necessary right now. We will re-introduces transactionality (and associated testing?) in a later changesets. A long list of TODOs have been added to the relevant comment. Differential Revision: https://phab.mercurial-scm.org/D10624
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 03 May 2021 12:34:11 +0200
parents 4d1c893b9095
children 130c9f7ed914
comparison
equal deleted inserted replaced
47233:bcafcd779d2e 47234:616b8f412676
131 FEATURES_BY_VERSION = { 131 FEATURES_BY_VERSION = {
132 REVLOGV0: { 132 REVLOGV0: {
133 b'inline': _no, 133 b'inline': _no,
134 b'generaldelta': _no, 134 b'generaldelta': _no,
135 b'sidedata': False, 135 b'sidedata': False,
136 b'docket': False,
136 }, 137 },
137 REVLOGV1: { 138 REVLOGV1: {
138 b'inline': _from_flag(FLAG_INLINE_DATA), 139 b'inline': _from_flag(FLAG_INLINE_DATA),
139 b'generaldelta': _from_flag(FLAG_GENERALDELTA), 140 b'generaldelta': _from_flag(FLAG_GENERALDELTA),
140 b'sidedata': False, 141 b'sidedata': False,
142 b'docket': False,
141 }, 143 },
142 REVLOGV2: { 144 REVLOGV2: {
143 # There is a bug in the transaction handling when going from an 145 # The point of inline-revlog is to reduce the number of files used in
144 # inline revlog to a separate index and data file. Turn it off until 146 # the store. Using a docket defeat this purpose. So we needs other
145 # it's fixed, since v2 revlogs sometimes get rewritten on exchange. 147 # means to reduce the number of files for revlogv2.
146 # See issue6485
147 b'inline': _no, 148 b'inline': _no,
148 b'generaldelta': _yes, 149 b'generaldelta': _yes,
149 b'sidedata': True, 150 b'sidedata': True,
151 b'docket': True,
150 }, 152 },
151 } 153 }
152 154
153 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000 155 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000