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This can help users track down the source of warnings
when presented with imperfect emails.
While we're at it, make the __WARN__ callback in t/v2writable.t
a no-op since we don't check for warnings, there.
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Newly-cloned epochs need to be in alternates file of
all.git for the web and NNTP interfaces to work. So
allow invocations of "public-inbox-index" to idempotently
ensure the epoch is visible from the all.git repo.
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We'll be using this sub to fill $GIT_DIR/objects/info/alternates
if somebody uses clone --mirror, too
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All of our internal epoch rollover calculations are done using
the estimated unpacked (and uncompressed) size of the repo. The
importer instance needs to check that unpacked size before
selecting an epoch when an epoch already has packed data.
This bug did not impact the initial mass imports since we only
initialize the Import instance once-per-epoch and did not need
to take existing epochs into account.
Tested manually with -mda on a local clone of LKML
Reported-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
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A stand-alone tool for purge will won't know the epoch
if nothing was ->add()-ed before.
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Otherwise, Perl may exit successfully when a failure code
is desired.
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We don't require every git epoch to exist since we support
the --skip feature in public-inbox-init.
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And doesn't try to access undef as an array ref.
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Hopefully this helps people familiarize themselves with
the source code.
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I've hit /proc/sys/fs/pipe-user-pages-* limits on some systems.
So stop hogging resources on pipes which don't benefit from
giant sizes.
Some of these can use eventfd in the future to further reduce
resource use.
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The new t/*filter_rubylang.t tests call -index immediately
after -init, which causes confusing messages to show up to
the end user.
Check the validity of the ref before calling "git-log".
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Clearly the AltId stuff was never tested for v2. Ensure
this tricky filter (which reuses Msgmap to avoid introducing
new serial numbers) doesn't trigger deadlocks SQLite due
to opening a DB for writing multiple times.
I went through several iterations of this change before
going with this one, which is the least intrusive I could
fine.
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There is no need for parallelism if we're not using Xapian.
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This allows archivists to publish incomplete archives with newer
mail while allowing "0.git" (or "1.git" and so on) epochs to be
added-after-the-fact (without affecting "git clone" followers).
A reindex will be necessary for Xapian and SQLite to catch up
once the old epochs are added; but the reindexing code is also
capable of tolerating missing epochs.
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Now that we track the num highwater mark it is safe to remove messages
from msgmap that have been previously allocated. Removing even the
highest numbered article will no longer cause new message numbers to
move backwards.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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The lookup to see if a num has already been assigned to a message
happens in a temporary copy of message map. It is possible that the
number has been removed from the current message map. The
unindex/reindex after a history rewrite triggered by a purge should be
one such case. Therefore add the number to the msgmap in case it is
not currently present.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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When performing an incremental index update with index_sync if a message is seen
to be both added and deleted update the num_highwater mark even though the
message is not otherwise indexed.
This ensures index_sync generates the same msgmap no matter which commit
it stops at during incremental syncs.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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Today the only thing that prevents public-inbox not reusing the
message numbers of deleted messages is the sqlite autoincrement magic
and that only works part of the time. The new incremental indexing
test has revealed areas where today public-inbox does try to reuse
numbers of deleted messages.
Reusing the message numbers of existing messages is a problem because
if a client ever sees messages that are subsequently deleted the
client will not see the new messages with their old numbers.
In practice this is difficult to trigger because it requires the most
recently added message to be removed and have the removal show up in a
separate pull request. Still it can happen and it should be handled.
Instead of infering the highset number ever used by finding the maximum
number in the message map, track the largest number ever assigned directly.
Update Msgmap to track this value and update the indexers to use this
value.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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The normal behavior is to prevent the deleted messages from
being indexed in the first place. However, when fetching
incrementally via git; public-inbox-index needs to account for
deleted files which were created outside of the most recent
fetch/reindexing window.
Reported-by: Eric W. Biederman <ebiederm@xmission.com>
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For v2 repositories with multiple epochs, we must not forget
about earlier epochs in clones. Ensure we update the alternates
file with all known epochs up to the current one.
Reported-by: Eric W. Biederman <ebiederm@xmission.com>
https://public-inbox.org/meta/871scj2vzi.fsf@xmission.com/
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We can't have files with permissions inconsistent with what's
in git objects.
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We generally do not want git to waste time finding abbreviations
and we do not want the possibility of them becoming ambiguous
over time, either.
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Some messages to git@vger went missing from Msgmap from old bugs
and became inaccessible via NNTP. Forcing NNTP article numbers
when the overview DB came about made the problem more visible when
reindexing old (v1) repositories as all removed spam messages
took up AUTOINCREMENT numbers again before they were removed.
Having large gaps in NNTP article numbers is not good since it
throws off NNTP clients. This does NOT prevent NNTP clients from
seeing some messages twice, but is better than having them
miss several messages entirely.
We also avoid depending on --reverse in git-log, as
git requires storing an entire commit list in memory for
--reverse, so it's cheaper to store only deleted blobs in the %D
hash since they do not live long.
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First off, decode text portions of messages since some archived
mail I got was converted from quoted-printable or base-64 to
8bit by the original recipient. Attempting to merge them with
my own archives (which had no conversion done) led to
unnecessary duplicates showing up.
Then, normalize CRLF line endings in text portions to LF.
In the headers, we relax the content_id hashing to ignore quotes
and lower-case domain names in To, Cc, and From headers since
some mail processors will alter them.
Finally, I've discovered Email::MIME->new($mime->as_string)
does not always round-trip reliably, so we calculate the
content_id twice on user-supplied messages.
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While hunting duplicates, I noticed a leading '-' in some
Message-IDs as a result of RFC4648 encoding. While '-' seems
allowed by RFC5322 and URL-friendly (RFC4648), they are uncommon
and make using Message-IDs as arguments for command-line tools
more difficult. So prefix them with a datestamp to at least
give readers some sense of the age. And shorten the "localhost"
hostname to "z" to save space.
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git fast-import and the main V2Writable process combined takes
about one CPU, so avoid having too many Xapian partitions which
cause unnecessary I/O contention.
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Since we only query the SQLite over DB for OVER/XOVER; do not
need to waste space storing fields To/Cc/:bytes/:lines or the
XNUM term. We only use From/Subject/References/Message-ID/:blob
in various places of the PSGI code.
For reindexing, we will take advantage of docid stability
in "xapian-compact --no-renumber" to ensure duplicates do not
show up in search results. Since the PSGI interface is the
only consumer of Xapian at the moment, it has no need to
search based on NNTP article number.
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Since we handle the overview info synchronously, we only need
barriers in tests, now. We will use asynchronous checkpoints
to sync less-important Xapian data.
For data deduplication, this requires us to hoist out the
cat-blob support in ::Import for reading uncommitted data
in git.
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Since the overview stuff is a synchronization point anyways,
move it into the main V2Writable process and allow us to
drop a bunch of code. This is another step towards making
Xapian optional for v2.
In other words, the fan-out point is moved and the Xapian
partitions no longer need to synchronize against each other:
Before:
/-------->\
/---------->\
v2writable -->+----parts----> over
\---------->/
\-------->/
After:
/---------->
/----------->
v2writable --> over-->+----parts--->
\----------->
\---------->
Since the overview/threading logic needs to run on the same core
that feeds git-fast-import, it's slower for small repos but is
not noticeable in large imports where I/O wait in the partitions
dominates.
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Favor simpler internal APIs this time around, this cuts
a fair amount of code out and takes another step towards
removing Xapian as a dependency for v2 repos.
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Some of this jankiness was from early performance problems
and they turned out to be unnecessary measures.
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This hopefully helps for people who try to understand
this design.
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For upgrades, this will let users keep an old version
running while performing "public-inbox-index" on the
newest version.
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The Xapian partitions will trigger the removal anyways.
Test this and fix some description/spelling errors
while we're at it.
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The partition count can change if public-inbox-compact runs
while public-inbox-watch or public-inbox-index is running.
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Xapian may become unhappy if a DB is modified during iteration:
nntp://news.gmane.org/20180228004400.GU12724@survex.com
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This is important for people running mirrors via "git fetch",
as they need to be kept up-to-date. Purging is also now
supported in mirrors.
The short-lived "--regenerate" option is gone and is now
implicitly enabled as a result. It's still cheap when
article number regeneration is unnecessary, as we track
the range for each git repository.
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We do not need to rewrite old commits unaffected by the object_id
purge, only newer commits. This was a state management bug :x
We will also return the new commit ID of rewritten history to
aid in incremental indexing of mirrors for the next change.
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searchidx_checkpoint was too convoluted and confusing.
Since barrier is mostly the same thing; use that instead
and add an fsync option for the overview DB.
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This ought to provide better performance and scalability
which is less dependent on inbox size. Xapian does not
seem optimized for some queries used by the WWW homepage,
Atom feeds, XOVER and NEWNEWS NNTP commands.
This can actually make Xapian optional for NNTP usage,
and allow more functionality to work without Xapian
installed.
Indexing performance was extremely bad at first, but
DBI::Profile helped me optimize away problematic queries.
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I was too aggressively disabling parallelization to speed up
the test suite and broke this :x Re-enable parallelization
for the v2reindex test so we can catch it later.
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We need to ensure there is only one file in the top-level tree
at any commit so the "add; remove; add;" sequence on the same
message is detected properly.
Otherwise, git will not detect the second "add" unless
a second message is added to history.
Deletes are now stored in "d" (and not "D" or "_/D") at the
top-level, now. There's no need to have a "_" to reduce churn
as "m" and "d" should never co-exist. It's now lowercased to
make it easier-to-distinguish from "D" in git-log output.
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Ensure -convert and -compact do not make repositories
unreadable on live servers.
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This is consistent with how we internally generate new
Message-IDs to break conflicts and allows ->reindex to
succeed while walking backwards through history
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By supporting purge and allowing users to delete git partitions,
we can open up ourselves to gaps and un-reindexible data. Let
that be.
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Somebody may only care about the most recent history,
so allow -init and -index to operate quietly on missing
partitions.
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And we do not want to start making confused repos if somebody
leaves out "-V2" the second time around.
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The layout of this structure ended up being a bit different
and the read-only access is handled through the ::Inbox class,
instead.
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Purging existing messages is fairly straightforward since we can
take advantage of Xapian and lookup the git object_id with it.
Unfortunately, purging an already "removed" message (which is
no longer in Xapian) is not as easy and we'll need to expose
->purge_oids to purge by the git object_id (currently SHA-1).
Furthermore, we expire reflogs and prune in hopes a dumb HTTP
client won't get the object.
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The original Message-ID is still the most important when
discussing with other recipients who do not rely on a message
flowing through public-inbox. So whatever Message-ID we use
to deduplicate internally will be secondary and less important.
All of our front-end v2 code is order-independent, so we won't
let the message count against us, that way.
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