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Code Issues Activity

🐛 Fix vthread pining on get-file-data-for-thumbnail rpc method

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This commit is contained in:
Andrey Antukh 2023-03-16 19:40:58 +01:00
parent 9173c73eca
commit 938890c04c
1 changed files with 18 additions and 0 deletions
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18
backend/src/app/rpc/commands/files.clj
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@ -670,12 +670,30 @@
;; --- COMMAND QUERY: get-file-data-for-thumbnail
;; FIXME: performance issue
;;
;; We need to improve how we set frame for thumbnail in order to avoid
;; loading all pages into memory for find the frame set for thumbnail.
(defn get-file-data-for-thumbnail
[conn {:keys [data id] :as file}]
(letfn [;; function responsible on finding the frame marked to be
;; used as thumbnail; the returned frame always have
;; the :page-id set to the page that it belongs.
(get-thumbnail-frame [data]
;; NOTE: this is a hack for avoid perform blocking
;; operation inside the for loop, clojure lazy-seq uses
;; synchronized blocks that does not plays well with
;; virtual threads, so we need to perform the load
;; operation first. This operation forces all pointer maps
;; load into the memory.
(->> (-> data :pages-index vals)
(filter pmap/pointer-map?)
(run! pmap/load!))
;; Then proceed to find the frame set for thumbnail
(d/seek :use-for-thumbnail?
(for [page (-> data :pages-index vals)
frame (-> page :objects ctt/get-frames)]