| commit | b2cf331057c5862526c26e610113b2ee804192aa | [log] [tgz] |
|---|---|---|
| author | Taylor Blau <me@ttaylorr.com> | Tue Jun 25 13:39:57 2024 -0400 |
| committer | Junio C Hamano <gitster@pobox.com> | Tue Jun 25 13:52:06 2024 -0700 |
| tree | ab17c6f5970fb8a26a68afac6a2dd98e10d2d805 | |
| parent | 5b5d5b598ccb8d5eb8a1de3abbf7b5829f9ac4fe [diff] |
bloom: prepare to discard incompatible Bloom filters Callers use the inline `get_bloom_filter()` implementation as a thin wrapper around `get_or_compute_bloom_filter()`. The former calls the latter with a value of "0" for `compute_if_not_present`, making `get_bloom_filter()` the default read-only path for fetching an existing Bloom filter. Callers expect the value returned from `get_bloom_filter()` is usable, that is that it's compatible with the configured value corresponding to `commitGraph.changedPathsVersion`. This is OK, since the commit-graph machinery only initializes its BDAT chunk (thereby enabling it to service Bloom filter queries) when the Bloom filter hash_version is compatible with our settings. So any value returned by `get_bloom_filter()` is trivially useable. However, subsequent commits will load the BDAT chunk even when the Bloom filters are built with incompatible hash versions. Prepare to handle this by teaching `get_bloom_filter()` to discard filters that are incompatible with the configured hash version. Callers who wish to read incompatible filters (e.g., for upgrading filters from v1 to v2) may use the lower level routine, `get_or_compute_bloom_filter()`. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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