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What does failed to unpack swapfile meta data mean?

April 26, 2017Data failed mean Meta swapfile unpack

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What does failed to unpack swapfile meta data mean?

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Each of Squid’s disk cache files has a metadata section at the beginning. This header is used to store the URL MD5, some StoreEntry data, and more. When Squid opens a disk file for reading, it looks for the meta data header and unpacks it.

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Each of Squid’s disk cache files has a metadata section at the beginning. This header is used to store the URL MD5, some StoreEntry data, and more. When Squid opens a disk file for reading, it looks for the meta data header and unpacks it. This warning means that Squid couln’t unpack the meta data. This is non-fatal bug, from which Squid can recover. Perhaps the meta data was just missing, or perhaps the file got corrupted. You do not need to worry about this warning. It means that Squid is double-checking that the disk file matches what Squid thinks should be there, and the check failed. Squid recorvers and generates a cache miss in this case.