Ubuntu Manpage: public-inbox-index - create and update search indices

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>

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

FILES

CONFIGURATION

ENVIRONMENT

UPGRADING

CONTACT

COPYRIGHT

SEE ALSO