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lvmetad: Make token_mismatch handling more robust in the clients.

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This commit is contained in:
Petr Rockai 2014-02-26 15:11:00 +01:00
parent 4143b284f8
commit 1769eddde7
1 changed files with 21 additions and 6 deletions
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27
lib/cache/lvmetad.c vendored
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@ -159,12 +159,27 @@ retry:
daemon_request_destroy(req);
if (!repl.error && !strcmp(daemon_reply_str(repl, "response", ""), "token_mismatch") &&
try < 2 && !test_mode()) {
if (lvmetad_pvscan_all_devs(_lvmetad_cmd, NULL)) {
++ try;
daemon_reply_destroy(repl);
goto retry;
}
try < 60 && !test_mode()) {
/*
* If another process is trying to scan, they might have the
* same future token id and it's better to wait and avoid doing
* the work multiple times. For the case the future token is
* different, the wait is randomized so that multiple waiting
* processes do not start scanning all at once.
*
* If the token is mismatched because of global_filter changes,
* we re-scan immediately, but if we lose the potential race for
* the update, we back off for a short while (0.2-2 seconds) and
* try again.
*/
if (!strcmp(daemon_reply_str(repl, "expected", ""), "update in progress") || try % 5)
usleep( 50000 + random() % 450000 ); /* 0.05 - 0.5s */
else
/* If the re-scan fails here, we try again later. */
lvmetad_pvscan_all_devs(_lvmetad_cmd, NULL);
++ try;
daemon_reply_destroy(repl);
goto retry;
}
return repl;