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It was making imports too noisy.
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As with the ::Import class this wraps, we want this to be
usable as a checkpoint and be able to call ->add afterwards.
We'll be relying on ->done to flush changes through all
partition and skeleton DBs for deduplication checks.
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A work-in-progress, but it appears the v2 UI pieces do
will not require a lot of work to do.
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The skeleton DB is where we store all the information needed
for NNTP overviews via XOVER. This seems to be the only change
necessary (besides eventually handling duplicates) necessary
to support our nntpd interface for v2 repositories.
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Iterating through a list of documents while modifying them does
not seem to be supported in Xapian and it can trigger
DatabaseCorruptError exceptions. This only worked with past
datasets out of dumb luck. With the work-in-progress "v2"
public-inbox layout, this problem might become more visible
as the "thread skeleton" is partitioned out to a separate,
smaller Xapian database.
I've reproduced the problem on both Debian 8.x and 9.x with
Xapian 1.2.19 (chert backend) and 1.4.3 (glass backend)
respectively.
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I added these while chasing down the DatabaseCorruptError
exceptions which turned out to be caused by Xapian DB
modifications during iteration.
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We need to ensure Xapian transaction commits are made to remote
partitions before associated commits hit the skeleton DB.
This causes unnecessary commits to be made to the skeleton DB;
but they're mostly harmless. Further work will be necessary
to ensure proper ordering and avoidance of unnecessary commits.
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Interchangably using "all", "skel", "threader", etc. were
confusing. Standardize on the "skeleton" term to describe
this class since it's also used for retrieval of basic headers.
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A different Xapian DB requires the use of a different Enquire
object. This is necessary for get_thread and thread skeleton
to work in the PSGI UI.
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We will need timestamp, YYYYMMDD, article number, and line count
for querying thread information (including XOVER for NNTP).
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Any Xapian DB is subject to the same errors and retries.
Perhaps in the future this can made more granular to avoid
unnecessary reopens.
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Make data passed via Storable to the skeleton worker
a little neater.
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Otherwise, references and thread linking doesn't happen
across subject mismatches. Oops, this is important.
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We haven't needed this since we integrated threading
and dropped Email::Abstract and Mail::Thread usage.
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This used to lookup the message in git, but no longer, so
remove a needless indirection layer and call add_message
directly.
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This makes viewing "ps" output nicer.
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This was adding a needless newline into doc_data
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It works around some bugs in older Email::MIME which we'll
find useful.
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Probably unnecessary, but set binmode for consistency across
platforms.
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Leaking these pipes to child processes wasn't harmful, but
made determining relationships and dataflow between processes
more confusing.
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Relying more on Xapian requires retrying reopens in more
places to ensure it does not fall down and show errors to
the user.
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Fortunately, Xapian multiple database support makes things
easier but we still need to handle the skeleton DB separately.
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This should give us an idea of how much a problem deduplication
will be.
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We want to reduce the time in the main V2Writable process
spends writing to the pipe, as the main process itself is
the primary source of contention.
While we're at it, always flush after writing to ensure
the child sees it at once. (Grr... Perl doesn't use writev)
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Instead of relying on the git object_id hash to partition,
round-robin to these partitions based on the NNTP article
number. This reduces the partition pipes as a source of
contention when two (or more) sequential messages end up
going to the same partition.
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The parallelization requires splitting Msgmap, text+term
indexing, and thread-linking out into separate processes.
git-fast-import is fast, so we don't bother parallelizing it.
Msgmap (SQLite) and thread-linking (Xapian) must be serialized
because they rely on monotonically increasing numbers (NNTP
article number and internal thread_id, respectively).
We handle msgmap in the main process which drives fast-import.
When the article number is retrieved/generated, we write the
entire message to per-partition subprocesses via pipes for
expensive text+term indexing.
When these per-partition subprocesses are done with the
expensive text+term indexing, they write SearchMsg (small data)
to a shared pipe (inherited from the main V2Writable process)
back to the threader, which runs its own subprocess.
The number of text+term Xapian partitions is chosen at import
and can be made equal to the number of cores in a machine.
V2Writable --> Import -> git-fast-import
\-> SearchIdxThread -> Msgmap (synchronous)
\-> SearchIdxPart[n] -> SearchIdx[*]
\-> SearchIdxThread -> SearchIdx ("threader", a subprocess)
[* ] each subprocess writes to threader
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It is less confusing without the clobber assignment; and
PublicInbox::MIME exists to workaround bugs in older
Email::MIME (which is in Debian 9 (stretch))
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This will let us quickly test between v2 and v1 inboxes.
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This is too slow, currently. Working with only 2017 LKML
archives:
git-only: ~1 minute
git + SQLite: ~12 minutes
git+Xapian+SQlite: ~45 minutes
So yes, it looks like we'll need to parallelize Xapian indexing,
at least.
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Since we'll be adding new repositories to the `alternates' file
in git, we must restart the `git cat-file --batch' process as
git currently does not detect changes to the alternates file
in long-running cat-file processes.
Don't bother with the `--batch-check' process since we won't be
using it with v2.
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Wrap the old Import package to enable creating new repos based
on size thresholds. This is better than relying on time-based
rotation as LKML traffic seems to be increasing.
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It won't be in v2
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In general, they are, but there's no way for or general purpose
mail server to enforce that. This is a step in allowing us
to handle more corner cases which existing lists throw at us.
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This likely has no real world implications, though, as we
fall back to Msgmap lookups anyways.
Broken since commit 7eeadcb62729b0efbcb53cd9b7b181897c92cf9a
("search: remove unnecessary abstractions and functionality")
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Despite email not existing until 1971; "Jan 1, 1970 00:00:00"
seems like a common default timestamp for some test emails
to use as a Date: header.
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There's a lot of crap in archives and git-fast-import
accepts empty names and email addresses for authors
just fine.
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Big lists are orders of magnitude more efficient with v2.
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For LKML, it appears we need an even more liberal parser than
RFC2822 date parser in git. I have not validated Date::Parse
parses dates correctly, but this at least prevents
git-fast-import(1) from choking.
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There's a lot of weird characters which show up in LKML archives
which we did not support before. Furthermore, allow spaces
before the '>' in the From: line as at least some non-spam
poster used it.
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I decided not to copy the notmuch implementation regarding
serialization of integers to Xapian metadata.
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This will allow easier-compatibility with v2 code which will
introduce content_id as the unique identifier.
The old "XMID" becomes "XM" as a free text searchable term.
"Q" becomes "XMID" as a boolean prefix.
There's no user-visible changes in this, but there needs to
be a schema version bump later on...
(more changes planned which can affect v1)
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Wrap "get-mark" and "checkpoint" commands for git-fast-import
while documenting/cementing parts of the API.
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This can be useful for getting baseline of performance
of just Email::MIME and Date: header parsing. We'll need
to do some Date: header parsing for LKML since there are
some wonky date formats which causes the git RFC822 parser
to choke.
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Oops, I guess this code was never called and may not be
needed. But for now, import it so it can run properly.
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Check for this before doing the Xapian-based v2 importer.
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Call order will need to change a bit since this is going to be
tied to Xapian
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We'll reuse this class in v2, but won't be utilizing
per-git-repository ssoma.lock files.
Meanwhile, stop treating ::Inbox objects as an afterthought
and allow importing name and email into them.
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For machines which have never seen ssoma, they don't need the
index so stop creating it.
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