> The case you described here is "almost correct". But there is an key here:
> B2 can't startup itself if journal disk is wiped out, because the cookie is
> missed.
This is what I expected to see, but isn't the case.
<snip>
List<Cookie> journalCookies = Lists.newArrayList();
// try to read cookie from journal directory.
for (File journalDirectory : journalDirectories) {
try {
Cookie journalCookie =
Cookie.readFromDirectory(journalDirectory);
journalCookies.add(journalCookie);
if (journalCookie.isBookieHostCreatedFromIp()) {
conf.setUseHostNameAsBookieID(false);
} else {
conf.setUseHostNameAsBookieID(true);
}
} catch (FileNotFoundException fnf) {
newEnv = true;
missedCookieDirs.add(journalDirectory);
}
}
</snip>
So if a journal is missing the cookie, newEnv is set to true. This
disabled the later checks.
> Hower it can still happen in a different case: bit flap. In your case, if
> fence bit in b2 is already persisted on disk, but it got corrupted. Then it
> will cause the issue you described. One problem is we don't have checksum
> on the index file header when it stores those fence bits.
Yes, this is also an issue.
-Ivan
