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authorEric Wong (Contractor, The Linux Foundation) <e@80x24.org>2018-02-22 01:49:08 +0000
committerEric Wong (Contractor, The Linux Foundation) <e@80x24.org>2018-02-22 18:33:46 +0000
commit9ecbfc09928dada28094fd3fc79e91a5472b27ea (patch)
treea829ab7765f45e139e8a9d5de1c3784fc26bbf69 /MANIFEST
parenta81ad9c4b1b5d8c2ae8444b6dcb8710bd361f628 (diff)
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
Diffstat (limited to 'MANIFEST')
1 files changed, 2 insertions, 0 deletions
diff --git a/MANIFEST b/MANIFEST
index 4b51b543..2a6f6f07 100644
@@ -84,6 +84,8 @@ lib/PublicInbox/Reply.pm