From: Daira Hopwood Date: Fri, 17 Apr 2015 18:08:22 +0000 (+0100) Subject: Remove unused files storage/lease.py and storage/expirer.py. X-Git-Url: https://git.rkrishnan.org/%5B/%5D%20/uri/frontends/%22news.html?a=commitdiff_plain;h=82b09ad326aaef29f295b7eb729a62438c1ffed5;p=tahoe-lafs%2Ftahoe-lafs.git Remove unused files storage/lease.py and storage/expirer.py. Signed-off-by: Daira Hopwood --- diff --git a/src/allmydata/storage/expirer.py b/src/allmydata/storage/expirer.py deleted file mode 100644 index a284d4f7..00000000 --- a/src/allmydata/storage/expirer.py +++ /dev/null @@ -1,425 +0,0 @@ -import time, os, pickle, struct -from allmydata.storage.crawler import ShareCrawler -from allmydata.storage.shares import get_share_file -from allmydata.storage.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 - and which have expired. I can remove the expired leases (if so - configured), and the share will be deleted when the last lease is - removed. - - I collect statistics on the leases and make these available to a web - status page, including:: - - Space recovered during this cycle-so-far: - actual (only if expiration_enabled=True): - num-buckets, num-shares, sum of share sizes, real disk usage - ('real disk usage' means we use stat(fn).st_blocks*512 and include any - space used by the directory) - what it would have been with the original lease expiration time - what it would have been with our configured expiration time - - Prediction of space that will be recovered during the rest of this cycle - Prediction of space that will be recovered by the entire current cycle. - - Space recovered during the last 10 cycles <-- saved in separate pickle - - Shares/buckets examined: - this cycle-so-far - prediction of rest of cycle - during last 10 cycles <-- separate pickle - start/finish time of last 10 cycles <-- separate pickle - expiration time used for last 10 cycles <-- separate pickle - - Histogram of leases-per-share: - this-cycle-to-date - last 10 cycles <-- separate pickle - Histogram of lease ages, buckets = 1day - cycle-to-date - last 10 cycles <-- separate pickle - - All cycle-to-date values remain valid until the start of the next cycle. - - """ - - slow_start = 360 # wait 6 minutes after startup - minimum_cycle_time = 12*60*60 # not more than twice per day - - def __init__(self, server, statefile, historyfile, - expiration_enabled, mode, - override_lease_duration, # used if expiration_mode=="age" - cutoff_date, # used if expiration_mode=="cutoff-date" - sharetypes): - self.historyfile = historyfile - self.expiration_enabled = expiration_enabled - self.mode = mode - self.override_lease_duration = None - self.cutoff_date = None - if self.mode == "age": - assert isinstance(override_lease_duration, (int, type(None))) - self.override_lease_duration = override_lease_duration # seconds - elif self.mode == "cutoff-date": - assert isinstance(cutoff_date, int) # seconds-since-epoch - assert cutoff_date is not None - self.cutoff_date = cutoff_date - else: - raise ValueError("GC mode '%s' must be 'age' or 'cutoff-date'" % mode) - self.sharetypes_to_expire = sharetypes - ShareCrawler.__init__(self, server, statefile) - - def add_initial_state(self): - # we fill ["cycle-to-date"] here (even though they will be reset in - # self.started_cycle) just in case someone grabs our state before we - # get started: unit tests do this - so_far = self.create_empty_cycle_dict() - self.state.setdefault("cycle-to-date", so_far) - # in case we upgrade the code while a cycle is in progress, update - # the keys individually - for k in so_far: - self.state["cycle-to-date"].setdefault(k, so_far[k]) - - # initialize history - if not os.path.exists(self.historyfile): - history = {} # cyclenum -> dict - f = open(self.historyfile, "wb") - pickle.dump(history, f) - f.close() - - def create_empty_cycle_dict(self): - recovered = self.create_empty_recovered_dict() - so_far = {"corrupt-shares": [], - "space-recovered": recovered, - "lease-age-histogram": {}, # (minage,maxage)->count - "leases-per-share-histogram": {}, # leasecount->numshares - } - return so_far - - def create_empty_recovered_dict(self): - recovered = {} - for a in ("actual", "original", "configured", "examined"): - for b in ("buckets", "shares", "sharebytes", "diskbytes"): - recovered[a+"-"+b] = 0 - recovered[a+"-"+b+"-mutable"] = 0 - recovered[a+"-"+b+"-immutable"] = 0 - return recovered - - def started_cycle(self, cycle): - self.state["cycle-to-date"] = self.create_empty_cycle_dict() - - def stat(self, fn): - return os.stat(fn) - - def process_bucket(self, cycle, prefix, prefixdir, storage_index_b32): - bucketdir = os.path.join(prefixdir, storage_index_b32) - s = self.stat(bucketdir) - would_keep_shares = [] - wks = None - - for fn in os.listdir(bucketdir): - try: - shnum = int(fn) - except ValueError: - 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, "unknown") - would_keep_shares.append(wks) - - sharetype = None - if wks: - # use the last share's sharetype as the buckettype - sharetype = wks[3] - rec = self.state["cycle-to-date"]["space-recovered"] - self.increment(rec, "examined-buckets", 1) - if sharetype: - self.increment(rec, "examined-buckets-"+sharetype, 1) - del wks - - try: - bucket_diskbytes = s.st_blocks * 512 - except AttributeError: - bucket_diskbytes = 0 # no stat().st_blocks on windows - if sum([wks[0] for wks in would_keep_shares]) == 0: - self.increment_bucketspace("original", bucket_diskbytes, sharetype) - if sum([wks[1] for wks in would_keep_shares]) == 0: - self.increment_bucketspace("configured", bucket_diskbytes, sharetype) - if sum([wks[2] for wks in would_keep_shares]) == 0: - self.increment_bucketspace("actual", bucket_diskbytes, sharetype) - - def process_share(self, sharefilename): - # first, find out what kind of a share it is - sf = get_share_file(sharefilename) - sharetype = sf.sharetype - now = time.time() - s = self.stat(sharefilename) - - num_leases = 0 - num_valid_leases_original = 0 - num_valid_leases_configured = 0 - expired_leases_configured = [] - - for li in sf.get_leases(): - num_leases += 1 - original_expiration_time = li.get_expiration_time() - grant_renew_time = li.get_grant_renew_time_time() - age = li.get_age() - self.add_lease_age_to_histogram(age) - - # expired-or-not according to original expiration time - if original_expiration_time > now: - num_valid_leases_original += 1 - - # expired-or-not according to our configured age limit - expired = False - if self.mode == "age": - age_limit = original_expiration_time - if self.override_lease_duration is not None: - age_limit = self.override_lease_duration - if age > age_limit: - expired = True - else: - assert self.mode == "cutoff-date" - if grant_renew_time < self.cutoff_date: - expired = True - if sharetype not in self.sharetypes_to_expire: - expired = False - - if expired: - expired_leases_configured.append(li) - else: - num_valid_leases_configured += 1 - - so_far = self.state["cycle-to-date"] - self.increment(so_far["leases-per-share-histogram"], num_leases, 1) - self.increment_space("examined", s, sharetype) - - would_keep_share = [1, 1, 1, sharetype] - - if self.expiration_enabled: - for li in expired_leases_configured: - sf.cancel_lease(li.cancel_secret) - - if num_valid_leases_original == 0: - would_keep_share[0] = 0 - self.increment_space("original", s, sharetype) - - if num_valid_leases_configured == 0: - would_keep_share[1] = 0 - self.increment_space("configured", s, sharetype) - if self.expiration_enabled: - would_keep_share[2] = 0 - self.increment_space("actual", s, sharetype) - - return would_keep_share - - def increment_space(self, a, s, sharetype): - sharebytes = s.st_size - try: - # note that stat(2) says that st_blocks is 512 bytes, and that - # st_blksize is "optimal file sys I/O ops blocksize", which is - # independent of the block-size that st_blocks uses. - diskbytes = s.st_blocks * 512 - except AttributeError: - # the docs say that st_blocks is only on linux. I also see it on - # MacOS. But it isn't available on windows. - diskbytes = sharebytes - so_far_sr = self.state["cycle-to-date"]["space-recovered"] - self.increment(so_far_sr, a+"-shares", 1) - self.increment(so_far_sr, a+"-sharebytes", sharebytes) - self.increment(so_far_sr, a+"-diskbytes", diskbytes) - if sharetype: - self.increment(so_far_sr, a+"-shares-"+sharetype, 1) - self.increment(so_far_sr, a+"-sharebytes-"+sharetype, sharebytes) - self.increment(so_far_sr, a+"-diskbytes-"+sharetype, diskbytes) - - def increment_bucketspace(self, a, bucket_diskbytes, sharetype): - rec = self.state["cycle-to-date"]["space-recovered"] - self.increment(rec, a+"-diskbytes", bucket_diskbytes) - self.increment(rec, a+"-buckets", 1) - if sharetype: - self.increment(rec, a+"-diskbytes-"+sharetype, bucket_diskbytes) - self.increment(rec, a+"-buckets-"+sharetype, 1) - - def increment(self, d, k, delta=1): - if k not in d: - d[k] = 0 - d[k] += delta - - def add_lease_age_to_histogram(self, age): - bucket_interval = 24*60*60 - bucket_number = int(age/bucket_interval) - bucket_start = bucket_number * bucket_interval - bucket_end = bucket_start + bucket_interval - k = (bucket_start, bucket_end) - self.increment(self.state["cycle-to-date"]["lease-age-histogram"], k, 1) - - def convert_lease_age_histogram(self, lah): - # convert { (minage,maxage) : count } into [ (minage,maxage,count) ] - # since the former is not JSON-safe (JSON dictionaries must have - # string keys). - json_safe_lah = [] - for k in sorted(lah): - (minage,maxage) = k - json_safe_lah.append( (minage, maxage, lah[k]) ) - return json_safe_lah - - def finished_cycle(self, cycle): - # add to our history state, prune old history - h = {} - - start = self.state["current-cycle-start-time"] - now = time.time() - h["cycle-start-finish-times"] = (start, now) - h["expiration-enabled"] = self.expiration_enabled - h["configured-expiration-mode"] = (self.mode, - self.override_lease_duration, - self.cutoff_date, - self.sharetypes_to_expire) - - s = self.state["cycle-to-date"] - - # state["lease-age-histogram"] is a dictionary (mapping - # (minage,maxage) tuple to a sharecount), but we report - # self.get_state()["lease-age-histogram"] as a list of - # (min,max,sharecount) tuples, because JSON can handle that better. - # We record the list-of-tuples form into the history for the same - # reason. - lah = self.convert_lease_age_histogram(s["lease-age-histogram"]) - h["lease-age-histogram"] = lah - h["leases-per-share-histogram"] = s["leases-per-share-histogram"].copy() - 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() - - history = pickle.load(open(self.historyfile, "rb")) - history[cycle] = h - while len(history) > 10: - oldcycles = sorted(history.keys()) - del history[oldcycles[0]] - f = open(self.historyfile, "wb") - pickle.dump(history, f) - f.close() - - def get_state(self): - """In addition to the crawler state described in - ShareCrawler.get_state(), I return the following keys which are - specific to the lease-checker/expirer. Note that the non-history keys - (with 'cycle' in their names) are only present if a cycle is - currently running. If the crawler is between cycles, it appropriate - to show the latest item in the 'history' key instead. Also note that - each history item has all the data in the 'cycle-to-date' value, plus - cycle-start-finish-times. - - cycle-to-date: - expiration-enabled - configured-expiration-mode - lease-age-histogram (list of (minage,maxage,sharecount) tuples) - leases-per-share-histogram - corrupt-shares (list of (si_b32,shnum) tuples, minimal verification) - space-recovered - - estimated-remaining-cycle: - # Values may be None if not enough data has been gathered to - # produce an estimate. - space-recovered - - estimated-current-cycle: - # cycle-to-date plus estimated-remaining. Values may be None if - # not enough data has been gathered to produce an estimate. - space-recovered - - history: maps cyclenum to a dict with the following keys: - cycle-start-finish-times - expiration-enabled - configured-expiration-mode - lease-age-histogram - leases-per-share-histogram - corrupt-shares - space-recovered - - The 'space-recovered' structure is a dictionary with the following - keys: - # 'examined' is what was looked at - examined-buckets, examined-buckets-mutable, examined-buckets-immutable - examined-shares, -mutable, -immutable - examined-sharebytes, -mutable, -immutable - examined-diskbytes, -mutable, -immutable - - # 'actual' is what was actually deleted - actual-buckets, -mutable, -immutable - actual-shares, -mutable, -immutable - actual-sharebytes, -mutable, -immutable - actual-diskbytes, -mutable, -immutable - - # would have been deleted, if the original lease timer was used - original-buckets, -mutable, -immutable - original-shares, -mutable, -immutable - original-sharebytes, -mutable, -immutable - original-diskbytes, -mutable, -immutable - - # would have been deleted, if our configured max_age was used - configured-buckets, -mutable, -immutable - configured-shares, -mutable, -immutable - configured-sharebytes, -mutable, -immutable - configured-diskbytes, -mutable, -immutable - - """ - progress = self.get_progress() - - state = ShareCrawler.get_state(self) # does a shallow copy - history = pickle.load(open(self.historyfile, "rb")) - state["history"] = history - - if not progress["cycle-in-progress"]: - del state["cycle-to-date"] - return state - - so_far = state["cycle-to-date"].copy() - state["cycle-to-date"] = so_far - - lah = so_far["lease-age-histogram"] - so_far["lease-age-histogram"] = self.convert_lease_age_histogram(lah) - so_far["expiration-enabled"] = self.expiration_enabled - so_far["configured-expiration-mode"] = (self.mode, - self.override_lease_duration, - self.cutoff_date, - self.sharetypes_to_expire) - - so_far_sr = so_far["space-recovered"] - remaining_sr = {} - remaining = {"space-recovered": remaining_sr} - cycle_sr = {} - cycle = {"space-recovered": cycle_sr} - - if progress["cycle-complete-percentage"] > 0.0: - pc = progress["cycle-complete-percentage"] / 100.0 - m = (1-pc)/pc - for a in ("actual", "original", "configured", "examined"): - for b in ("buckets", "shares", "sharebytes", "diskbytes"): - for c in ("", "-mutable", "-immutable"): - k = a+"-"+b+c - remaining_sr[k] = m * so_far_sr[k] - cycle_sr[k] = so_far_sr[k] + remaining_sr[k] - else: - for a in ("actual", "original", "configured", "examined"): - for b in ("buckets", "shares", "sharebytes", "diskbytes"): - for c in ("", "-mutable", "-immutable"): - k = a+"-"+b+c - remaining_sr[k] = None - cycle_sr[k] = None - - state["estimated-remaining-cycle"] = remaining - state["estimated-current-cycle"] = cycle - return state diff --git a/src/allmydata/storage/lease.py b/src/allmydata/storage/lease.py deleted file mode 100644 index cd176aee..00000000 --- a/src/allmydata/storage/lease.py +++ /dev/null @@ -1,47 +0,0 @@ -import struct, time - -class LeaseInfo: - def __init__(self, owner_num=None, renew_secret=None, cancel_secret=None, - expiration_time=None, nodeid=None): - self.owner_num = owner_num - self.renew_secret = renew_secret - self.cancel_secret = cancel_secret - self.expiration_time = expiration_time - if nodeid is not None: - assert isinstance(nodeid, str) - assert len(nodeid) == 20 - self.nodeid = nodeid - - def get_expiration_time(self): - return self.expiration_time - def get_grant_renew_time_time(self): - # hack, based upon fixed 31day expiration period - return self.expiration_time - 31*24*60*60 - def get_age(self): - return time.time() - self.get_grant_renew_time_time() - - def from_immutable_data(self, data): - (self.owner_num, - self.renew_secret, - self.cancel_secret, - self.expiration_time) = struct.unpack(">L32s32sL", data) - self.nodeid = None - return self - def to_immutable_data(self): - return struct.pack(">L32s32sL", - self.owner_num, - self.renew_secret, self.cancel_secret, - int(self.expiration_time)) - - def to_mutable_data(self): - return struct.pack(">LL32s32s20s", - self.owner_num, - int(self.expiration_time), - self.renew_secret, self.cancel_secret, - self.nodeid) - def from_mutable_data(self, data): - (self.owner_num, - self.expiration_time, - self.renew_secret, self.cancel_secret, - self.nodeid) = struct.unpack(">LL32s32s20s", data) - return self