Hi,all
I want to parse big log files using Clojure.
And the structure of each line record is
"UserID,Lantitude,Lontitude,Timestamp".
My implemented steps are:
----> Read log file & Get top-n user list
----> Find each top-n user's records and store in separate log file
(UserID.log) .
The implement source code :
;======================================================
(defn parse-file
""
[file n]
(with-open [rdr (io/reader file)]
(println "001 begin with open ")
(let [lines (line-seq rdr)
res (parse-recur lines)
sorted
(into (sorted-map-by (fn [key1 key2]
(compare [(get res key2) key2]
[(get res key1) key1])))
res)]
(println "Statistic result : " res)
(println "Top-N User List : " sorted)
(find-write-recur lines sorted n)
)))
(defn parse-recur
""
[lines]
(loop [ls lines
res {}]
(if ls
(recur (next ls)
(update-res res (first ls)))
res)))
(defn update-res
""
[res line]
(let [params (string/split line #",")
id (if (> (count params) 1) (params 0) "0")]
(if (res id)
(update-in res [id] inc)
(assoc res id 1))))
(defn find-write-recur
"Get each users' records and store into separate log file"
[lines sorted n]
(loop [x n
sd sorted
id (first (keys sd))]
(if (and (> x 0) sd)
(do (create-write-file id
(find-recur lines id))
(recur (dec x)
(rest sd)
(nth (keys sd) 1))))))
(defn find-recur
""
[lines id]
(loop [ls lines
res []]
(if ls
(recur (next ls)
(update-vec res id (first ls)))
res)))
(defn update-vec
""
[res id line]
(let [params (string/split line #",")
id_ (if (> (count params) 1) (params 0) "0")]
(if (= id id_ )
(conj res line)
res)))
(defn create-write-file
"Create a new file and write information into the file."
([file info-lines]
(with-open [wr (io/writer (str MAIN-PATH file))]
(doseq [line info-lines] (.write wr (str line "\n")))
))
([file info-lines append?]
(with-open [wr (io/writer (str MAIN-PATH file) :append append?)]
(doseq [line info-lines] (.write wr (str line "\n"))))
))
;======================================================
I tested this clj in REPL with command (parse-file "./DATA/log.log" 3), and
get the results:
Records Size Time Result
1,000 42KB <1s OK
10,000 420KB <1s OK
100,000 4.3MB 3s OK
1,000,000 43MB 15s OK
6,000,000 258MB >20M "OutOfMemoryError Java heap space
java.lang.String.substring (String.java:1913)"
======================================================
Here is the question:
1. how can i fix the error when i try to parse big log file , like > 200MB
2. how can i optimize the function to run faster ?
3. there are logs more than 1G size , how can the function deal with it.
I am still new to Clojure, any suggestion or solution will be appreciate~
Thanks
BR
------------------------------------
刘家齐 （Jacky Liu）
手机：15201091195 邮箱：liujiaq...@gmail.com
Skype：jacky_liu_1987 QQ：406229156
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