table of contents
PUBLIC-INBOX-INDEX(1) | public-inbox user manual | PUBLIC-INBOX-INDEX(1) |
NAME¶
public-inbox-index - create and update search indices
SYNOPSIS¶
public-inbox-index [OPTIONS] INBOX_DIR...
public-inbox-index [OPTIONS] --all
DESCRIPTION¶
public-inbox-index creates and updates the search, overview and NNTP article number database used by the read-only public-inbox HTTP and NNTP interfaces. Currently, this requires DBD::SQLite and DBI Perl modules. Search::Xapian is optional, only to support the PSGI search interface.
Once the initial indices are created by public-inbox-index, public-inbox-mda(1) and public-inbox-watch(1) will automatically maintain them.
Running this manually to update indices is only required if relying on git-fetch(1) to mirror an existing public-inbox; or if upgrading to a new version of public-inbox using the "--reindex" option.
Having the overview and article number database is essential to running the NNTP interface, and strongly recommended for the HTTP interface as it provides thread grouping in addition to normal search functionality.
OPTIONS¶
- -j JOBS
- --jobs=JOBS
- Influences the number of Xapian indexing shards in a
(public-inbox-v2-format(5)) inbox.
See "--jobs" in public-inbox-init(1) for a full description of sharding.
"--jobs=0" is accepted as of public-inbox 1.6.0 to disable parallel indexing regardless of the number of pre-existing shards.
If the inbox has not been indexed or initialized, "JOBS - 1" shards will be created (one job is always needed for indexing the overview and article number mapping).
Default: the number of existing Xapian shards
- -c
- --compact
- Compacts the Xapian DBs after indexing. This is recommended when using
"--reindex" to avoid running out of disk
space while indexing multiple inboxes.
While option takes a negligible amount of time compared to "--reindex", it requires temporarily duplicating the entire contents of the Xapian DB.
This switch may be specified twice, in which case compaction happens both before and after indexing to minimize the temporal footprint of the (re)indexing operation.
Available since public-inbox 1.4.0.
- --reindex
- Forces a re-index of all messages in the inbox. This can be used for
in-place upgrades and bugfixes while NNTP/HTTP server processes are
utilizing the index. Keep in mind this roughly doubles the size of the
already-large Xapian database. Using this with
"--compact" or running
public-inbox-compact(1) afterwards is recommended to release free
space.
public-inbox protects writes to various indices with flock(2), so it is safe to reindex (and rethread) while public-inbox-watch(1), public-inbox-mda(1) or public-inbox-learn(1) run.
This does not touch the NNTP article number database. It does not affect threading unless "--rethread" is used.
- --all
- Index all inboxes configured in ~/.public-inbox/config. This is an alternative to specifying individual inboxes directories on the command-line.
- --rethread
- Regenerate internal THREADID and message thread associations when
reindexing.
This fixes some bugs in older versions of public-inbox. While it is possible to use this without "--reindex", it makes little sense to do so.
Available in public-inbox 1.6.0+.
- --prune
- Run git-gc(1) to prune and expire reflogs if discontiguous history
is detected. This is intended to be used in mirrors after running
public-inbox-edit(1) or public-inbox-purge(1) to ensure data
is expunged from mirrors.
Available since public-inbox 1.2.0.
- --max-size SIZE
- Sets or overrides "publicinbox.indexMaxSize" on a per-invocation
basis. See "publicinbox.indexMaxSize" below.
Available since public-inbox 1.5.0.
- --batch-size SIZE
- Sets or overrides "publicinbox.indexBatchSize" on a
per-invocation basis. See "publicinbox.indexBatchSize" below.
When using rotational storage but abundant RAM, using a large value (e.g. "500m") with "--sequential-shard" can significantly speed up and reduce fragmentation during the initial index and full "--reindex" invocations (but not incremental updates).
Available in public-inbox 1.6.0+.
- --no-fsync
- Disables fsync(2) and fdatasync(2) operations on SQLite and
Xapian. This is only effective with Xapian 1.4+. This is primarily
intended for systems with low RAM and the small (default)
"--batch-size=1m". Users of large
"--batch-size" may even find disabling
fdatasync(2) causes too much dirty data to accumulate, resulting on
latency spikes from writeback.
Available in public-inbox 1.6.0+.
- --dangerous
- Speed up initial index by using in-place updates and denying support for
concurrent readers. This is only effective with Xapian 1.4+.
Available in public-inbox 1.8.0+
- --sequential-shard
- Sets or overrides "publicinbox.indexSequentialShard" on a
per-invocation basis. See "publicinbox.indexSequentialShard"
below.
Available in public-inbox 1.6.0+.
- --skip-docdata
- Stop storing document data in Xapian on an existing inbox.
See "--skip-docdata" in public-inbox-init(1) for description and caveats.
Available in public-inbox 1.6.0+.
- -E EXTINDEX
- --update-extindex=EXTINDEX
- Update the given external index (public-inbox-extindex-format(5).
Either the configured section name (e.g.
"all") or a directory name may be
specified.
Defaults to "all" if "[extindex "all"]" is configured, otherwise no external indices are updated.
May be specified multiple times in rare cases where multiple external indices are configured.
- --no-update-extindex
- Do not update the "all" external index by default. This negates all uses of "-E" / "--update-extindex=" on the command-line.
- --since=DATESTRING
- --after=DATESTRING
- --until=DATESTRING
- --before=DATESTRING
- Passed directly to git-log(1) to limit changes for "--reindex"
FILES¶
For v1 (ssoma) repositories described in public-inbox-v1-format(5). All public-inbox-specific files are contained within the "$GIT_DIR/public-inbox/" directory.
v2 inboxes are described in public-inbox-v2-format(5).
CONFIGURATION¶
- publicinbox.indexMaxSize
- Prevents indexing of messages larger than the specified size value. A
single suffix modifier of "k",
"m" or
"g" is supported, thus the value of
"1m" to prevents indexing of messages
larger than one megabyte.
This is useful for avoiding memory exhaustion in mirrors via git. It does not prevent public-inbox-mda(1) or public-inbox-watch(1) from importing (and indexing) a message.
This option is only available in public-inbox 1.5 or later.
Default: none
- publicinbox.indexBatchSize
- Flushes changes to the filesystem and releases locks after indexing the
given number of bytes. The default value of
"1m" (one megabyte) is low to minimize
memory use and reduce contention with parallel invocations of
public-inbox-mda(1), public-inbox-learn(1), and
public-inbox-watch(1).
Increase this value on powerful systems to improve throughput at the expense of memory use. The reduction of lock granularity may not be noticeable on fast systems. With SSDs, values above "4m" have little benefit.
For public-inbox-v2-format(5) inboxes, this value is multiplied by the number of Xapian shards. Thus a typical v2 inbox with 3 shards will flush every 3 megabytes by default unless parallelism is disabled via "--sequential-shard" or "--jobs=0".
This influences memory usage of Xapian, but it is not exact. The actual memory used by Xapian and Perl has been observed in excess of 10x this value.
This option is available in public-inbox 1.6 or later. public-inbox 1.5 and earlier used the current default, "1m".
Default: 1m (one megabyte)
- publicinbox.indexSequentialShard
- For public-inbox-v2-format(5) inboxes, setting this to
"true" allows indexing Xapian shards in
multiple passes. This speeds up indexing on rotational storage with high
seek latency by allowing individual shards to fit into the kernel page
cache.
Using a higher-than-normal number of "--jobs" with public-inbox-init(1) may be required to ensure individual shards are small enough to fit into cache.
Warning: interrupting "public-inbox-index(1)" while this option is in use may leave the search indices out-of-date with respect to SQLite databases. WWW and IMAP users may notice incomplete search results, but it is otherwise non-fatal. Using "--reindex" will bring everything back up-to-date.
Available in public-inbox 1.6.0+.
This is ignored on public-inbox-v1-format(5) inboxes.
Default: false, shards are indexed in parallel
- publicinbox.<name>.indexSequentialShard
- Identical to "publicinbox.indexSequentialShard", but only affect the inbox matching <name>.
ENVIRONMENT¶
- PI_CONFIG
- Used to override the default "~/.public-inbox/config" value.
- XAPIAN_FLUSH_THRESHOLD
- The number of documents to update before committing changes to disk. This
environment is handled directly by Xapian, refer to Xapian API
documentation for more details.
For public-inbox 1.6 and later, use "publicinbox.indexBatchSize" instead.
Setting "XAPIAN_FLUSH_THRESHOLD" or "publicinbox.indexBatchSize" for a large "--reindex" may cause public-inbox-mda(1), public-inbox-learn(1) and public-inbox-watch(1) tasks to wait long and unpredictable periods of time during "--reindex".
Default: none, uses "publicinbox.indexBatchSize"
UPGRADING¶
Occasionally, public-inbox will update it's schema version and require a full index by running this command.
CONTACT¶
Feedback welcome via plain-text mail to <mailto:meta@public-inbox.org>
The mail archives are hosted at <https://public-inbox.org/meta/> and <http://4uok3hntl7oi7b4uf4rtfwefqeexfzil2w6kgk2jn5z2f764irre7byd.onion/meta/>
COPYRIGHT¶
Copyright all contributors <mailto:meta@public-inbox.org>
License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
SEE ALSO¶
Search::Xapian, DBD::SQLite, public-inbox-extindex-format(5)
1993-10-02 | public-inbox.git |