commit | 663b2b1b90bf76275044824ddeca96aaec240f09 | [log] [tgz] |
---|---|---|
author | Derrick Stolee <dstolee@microsoft.com> | Thu Sep 17 18:11:46 2020 +0000 |
committer | Junio C Hamano <gitster@pobox.com> | Thu Sep 17 11:30:05 2020 -0700 |
tree | 1d52df4f64a22b1d9e6d99e9d11432bbe21a669e | |
parent | 3103e9848f7b7534eac14c0521d7b49b32466b70 [diff] |
maintenance: add commit-graph task The first new task in the 'git maintenance' builtin is the 'commit-graph' task. This updates the commit-graph file incrementally with the command git commit-graph write --reachable --split By writing an incremental commit-graph file using the "--split" option we minimize the disruption from this operation. The default behavior is to merge layers until the new "top" layer is less than half the size of the layer below. This provides quick writes most of the time, with the longer writes following a power law distribution. Most importantly, concurrent Git processes only look at the commit-graph-chain file for a very short amount of time, so they will verly likely not be holding a handle to the file when we try to replace it. (This only matters on Windows.) If a concurrent process reads the old commit-graph-chain file, but our job expires some of the .graph files before they can be read, then those processes will see a warning message (but not fail). This could be avoided by a future update to use the --expire-time argument when writing the commit-graph. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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