Question #191424 on Graphite changed:
https://answers.launchpad.net/graphite/+question/191424
Status: Open => Answered
Michael Leinartas proposed the following answer:
Generally it's best to delete any corrupt Whisper files. If you *really*
need to recover some data or something, it might involve understanding
the format (it's not too bad) and some coding. If the files are merely
truncated, you might try the steps below. It should also work as long as
the file is still contiguous (bytes havent shifted any):
Create a new file with the same retention as the old one.
Run whisper-info.py on the new file and note the offset and points values of
each of the archives
For each archive and with offset as OFFSET and points as POINTS:
dd bs=12 if=$OLDFILE of=$NEWFILE skip=$(($OFFSET + 12)) seek=$(($OFFSET + 12))
count=$POINTS
This will skip to the beginning of the archive, skip the archive header
(12 bytes), and copy only the data portion of the archive (each point 12
bytes).
If you try it, let us know how it goes
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