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tsdb/chunks: preallocate at least some space on non-Windows systems (#9581)
To avoid potential chunk corruption read, which I am not sure why is happening. Closes #9561. Signed-off-by: Mateusz Gozdek <mgozdekof@gmail.com>
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@ -17,5 +17,6 @@
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// HeadChunkFilePreallocationSize is the size to which the m-map file should be preallocated when a new file is cut.
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// Windows needs pre-allocations while the other OS does not.
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var HeadChunkFilePreallocationSize int64
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// Windows needs pre-allocations while the other OS does not. But we observed that a 0 pre-allocation causes unit tests to flake.
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// This small allocation for non-Windows OSes removes the flake.
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var HeadChunkFilePreallocationSize int64 = MinWriteBufferSize * 2
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