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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2015-12-11 09:10:33 -0500
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2015-12-13 14:54:47 -0500
commit1f4b467daa2999ab0e4345c1f1069567852f567f (patch)
treef15a02037237dfd9313cbac7aaff3d71a259698e /src/journal/catalog.c
parent2aaec9b4f61c1c1fa3374f40f0f1e828b6c53e1e (diff)
journal: in some cases we have to decompress the full lz4 field
lz4 has to decompress a whole "sequence" at a time. When the compressed data is composed of a repeating pattern, the whole set of repeats has do be docompressed, and the output buffer has to be big enough. This is unfortunate, because potentially the slowdown is very big. We are only interested in the field name, but we might have to decompress the whole thing. But the full cost will be borne out only when the full entry is a repeating pattern. In practice this shouldn't happen (apart from tests and the like). Hopefully lz4 will be fixed to avoid this problem, or it will grow a new function which we can use [1], so this fix should be remporary. [1] https://groups.google.com/d/msg/lz4c/_3kkz5N6n00/oTahzqErCgAJ
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