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< h1 id = "background-updates-api" > < a class = "header" href = "#background-updates-api" > Background Updates API< / a > < / h1 >
< p > This API allows a server administrator to manage the background updates being
run against the database.< / p >
< h2 id = "status" > < a class = "header" href = "#status" > Status< / a > < / h2 >
< p > This API gets the current status of the background updates.< / p >
< p > The API is:< / p >
< pre > < code > GET /_synapse/admin/v1/background_updates/status
< / code > < / pre >
< p > Returning:< / p >
< pre > < code class = "language-json" > {
" enabled" : true,
" current_updates" : {
" < db_name> " : {
" name" : " < background_update_name> " ,
" total_item_count" : 50,
" total_duration_ms" : 10000.0,
" average_items_per_ms" : 2.2,
},
}
}
< / code > < / pre >
< p > < code > enabled< / code > whether the background updates are enabled or disabled.< / p >
< p > < code > db_name< / code > the database name (usually Synapse is configured with a single database named 'master').< / p >
< p > For each update:< / p >
< p > < code > name< / code > the name of the update.
< code > total_item_count< / code > total number of " items" processed (the meaning of 'items' depends on the update in question).
< code > total_duration_ms< / code > how long the background process has been running, not including time spent sleeping.
< code > average_items_per_ms< / code > how many items are processed per millisecond based on an exponential average.< / p >
< h2 id = "enabled" > < a class = "header" href = "#enabled" > Enabled< / a > < / h2 >
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< p > This API allows pausing background updates.< / p >
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< p > Background updates should < em > not< / em > be paused for significant periods of time, as
this can affect the performance of Synapse.< / p >
< p > < em > Note< / em > : This won't persist over restarts.< / p >
< p > < em > Note< / em > : This won't cancel any update query that is currently running. This is
usually fine since most queries are short lived, except for < code > CREATE INDEX< / code >
background updates which won't be cancelled once started.< / p >
< p > The API is:< / p >
< pre > < code > POST /_synapse/admin/v1/background_updates/enabled
< / code > < / pre >
< p > with the following body:< / p >
< pre > < code class = "language-json" > {
" enabled" : false
}
< / code > < / pre >
< p > < code > enabled< / code > sets whether the background updates are enabled or disabled.< / p >
< p > The API returns the < code > enabled< / code > param.< / p >
< pre > < code class = "language-json" > {
" enabled" : false
}
< / code > < / pre >
< p > There is also a < code > GET< / code > version which returns the < code > enabled< / code > state.< / p >
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< h2 id = "run" > < a class = "header" href = "#run" > Run< / a > < / h2 >
< p > This API schedules a specific background update to run. The job starts immediately after calling the API.< / p >
< p > The API is:< / p >
< pre > < code > POST /_synapse/admin/v1/background_updates/start_job
< / code > < / pre >
< p > with the following body:< / p >
< pre > < code class = "language-json" > {
" job_name" : " populate_stats_process_rooms"
}
< / code > < / pre >
< p > The following JSON body parameters are available:< / p >
< ul >
< li > < code > job_name< / code > - A string which job to run. Valid values are:
< ul >
< li > < code > populate_stats_process_rooms< / code > - Recalculate the stats for all rooms.< / li >
< li > < code > regenerate_directory< / code > - Recalculate the < a href = "../../../user_directory.html" > user directory< / a > if it is stale or out of sync.< / li >
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