From: Brian Warner Date: Mon, 9 Mar 2009 03:08:40 +0000 (-0700) Subject: expirer: tolerate corrupt shares, add them to the state and history for future examin... X-Git-Tag: allmydata-tahoe-1.4.0~73 X-Git-Url: https://git.rkrishnan.org/Site/Content/Exhibitors/running.html?a=commitdiff_plain;h=6d6049430ce21f72a6af46c581acb211fe24dc6d;p=tahoe-lafs%2Ftahoe-lafs.git expirer: tolerate corrupt shares, add them to the state and history for future examination --- diff --git a/src/allmydata/storage/expirer.py b/src/allmydata/storage/expirer.py index 42691b06..79254241 100644 --- a/src/allmydata/storage/expirer.py +++ b/src/allmydata/storage/expirer.py @@ -1,6 +1,9 @@ -import time, os, pickle +import time, os, pickle, struct from crawler import ShareCrawler from shares import get_share_file +from common import UnknownMutableContainerVersionError, \ + UnknownImmutableContainerVersionError +from twisted.python import log as twlog class LeaseCheckingCrawler(ShareCrawler): """I examine the leases on all shares, determining which are still valid @@ -70,6 +73,7 @@ class LeaseCheckingCrawler(ShareCrawler): recovered = self.create_empty_recovered_dict() so_far = {"buckets-examined": 0, "shares-examined": 0, + "corrupt-shares": [], "space-recovered": recovered, "lease-age-histogram": {}, # (minage,maxage)->count "leases-per-share-histogram": {}, # leasecount->numshares @@ -99,10 +103,20 @@ class LeaseCheckingCrawler(ShareCrawler): for fn in os.listdir(bucketdir): try: shnum = int(fn) - wks = self.process_share(os.path.join(bucketdir, fn)) - would_keep_shares.append(wks) except ValueError: - pass # non-numeric means not a sharefile + continue # non-numeric means not a sharefile + sharefile = os.path.join(bucketdir, fn) + try: + wks = self.process_share(sharefile) + except (UnknownMutableContainerVersionError, + UnknownImmutableContainerVersionError, + struct.error): + twlog.msg("lease-checker error processing %s" % sharefile) + twlog.err() + which = (storage_index_b32, shnum) + self.state["cycle-to-date"]["corrupt-shares"].append(which) + wks = (1, 1, 1) + would_keep_shares.append(wks) recovered = self.state["cycle-to-date"]["space-recovered"] if sum([wks[0] for wks in would_keep_shares]) == 0: self.increment(recovered, @@ -233,6 +247,7 @@ class LeaseCheckingCrawler(ShareCrawler): h["leases-per-share-histogram"] = s["leases-per-share-histogram"].copy() h["buckets-examined"] = s["buckets-examined"] h["shares-examined"] = s["shares-examined"] + h["corrupt-shares"] = s["corrupt-shares"][:] # note: if ["shares-recovered"] ever acquires an internal dict, this # copy() needs to become a deepcopy h["space-recovered"] = s["space-recovered"].copy() @@ -261,6 +276,7 @@ class LeaseCheckingCrawler(ShareCrawler): configured-expiration-time lease-age-histogram (list of (minage,maxage,sharecount) tuples) leases-per-share-histogram + corrupt-shares (list of (si_b32,shnum) tuples, minimal verification) buckets-examined shares-examined space-recovered @@ -285,6 +301,7 @@ class LeaseCheckingCrawler(ShareCrawler): configured-expiration-time lease-age-histogram leases-per-share-histogram + corrupt-shares buckets-examined shares-examined space-recovered diff --git a/src/allmydata/test/test_storage.py b/src/allmydata/test/test_storage.py index f7b9783f..2da33022 100644 --- a/src/allmydata/test/test_storage.py +++ b/src/allmydata/test/test_storage.py @@ -1695,6 +1695,7 @@ class LeaseCrawler(unittest.TestCase, pollmixin.PollMixin, WebRenderingMixin): {1: 2, 2: 2}) self.failUnlessEqual(last["buckets-examined"], 4) self.failUnlessEqual(last["shares-examined"], 4) + self.failUnlessEqual(last["corrupt-shares"], []) rec = last["space-recovered"] self.failUnlessEqual(rec["actual-numbuckets"], 0) @@ -1998,6 +1999,64 @@ class LeaseCrawler(unittest.TestCase, pollmixin.PollMixin, WebRenderingMixin): d.addCallback(_check) return d + def test_bad_share(self): + basedir = "storage/LeaseCrawler/bad_share" + fileutil.make_dirs(basedir) + ss = StorageServer(basedir, "\x00" * 20) + w = StorageStatus(ss) + # make it start sooner than usual. + lc = ss.lease_checker + lc.slow_start = 0 + lc.cpu_slice = 500 + + # create a few shares, with some leases on them + self.make_shares(ss) + + # now corrupt one, and make sure the lease-checker keeps going + [immutable_si_0, immutable_si_1, mutable_si_2, mutable_si_3] = self.sis + first_mutable = min(mutable_si_2, mutable_si_3) + fn = os.path.join(ss.sharedir, storage_index_to_dir(first_mutable), "0") + f = open(fn, "rb+") + f.seek(0) + f.write("BAD MAGIC") + f.close() + # get_share_file() doesn't see the correct mutable magic, so it + # assumes the file is an immutable share, and then + # immutable.ShareFile sees a bad version. So this actually triggers + # UnknownImmutableContainerVersionError. + + ss.setServiceParent(self.s) + + def _wait(): + return bool(lc.get_state()["last-cycle-finished"] is not None) + d = self.poll(_wait) + + def _after_first_cycle(ignored): + s = lc.get_state() + last = s["history"][0] + self.failUnlessEqual(last["buckets-examined"], 4) + self.failUnlessEqual(last["shares-examined"], 3) + self.failUnlessEqual(last["corrupt-shares"], + [(base32.b2a(first_mutable), 0)]) + self.flushLoggedErrors(UnknownMutableContainerVersionError, + UnknownImmutableContainerVersionError) + d.addCallback(_after_first_cycle) + d.addCallback(lambda ign: self.render_json(w)) + def _check_json(json): + data = simplejson.loads(json) + # grr. json turns all dict keys into strings. + last = data["lease-checker"]["history"]["0"] + corrupt_shares = last["corrupt-shares"] + # it also turns all tuples into lists + self.failUnlessEqual(corrupt_shares, + [[base32.b2a(first_mutable), 0]]) + d.addCallback(_check_json) + return d + + def render_json(self, page): + d = self.render1(page, args={"t": ["json"]}) + return d + class NoStatvfsServer(StorageServer): def do_statvfs(self): raise AttributeError