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POMultiple Parallel grep of big file using scala future not as speedy as required
 

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  1. POMultiple Parallel grep of big file using scala future not as speedy as required
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    <p>I have a considerably big file(20-30 Mb) . I have a map where I have a key and the corresponding regex as value which I need to grep in the file to get the actual value of the key and store the new key,value in a new map . So here is my approach </p> <pre><code>contextmap //initial map which contains key and value in form of regex contextstrings // final map supposed to have value after the grep def fgrepFuture(e: (String,String)) = Future { val re = new Regex(e._2) Source.fromFile(f).getLines.foreach { re findFirstMatchIn _ match { case None =&gt; ("","") case Some(x) =&gt;(e._1,x.group(1)) } } } val fg = Future.traverse(tmpmap)(fgrepFuture) fg onComplete{ case tups =&gt; for(t &lt;- tups) contextstrings += (t.toString.split(",").head -&gt; t.toString.split(",").tail.head) } </code></pre> <p>Problem here is that by the time future completes my rest of the code(based on asynchronous model of akka actors) moves ahead too far that I don't have the grepped value from file in quick time (which I want to be globally available).I need to get the values fast which I don't know why this approach is not giving me(since multiple future works in parallel),so please point out the flaw.Also <strong>if at all there is a better approach</strong> to get <strong>multiple</strong> value grepped from a <strong>considerably large file</strong> please suggest that as well.</p>
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    1. USHarsh Gupta
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    1. COyou could use the await method ?
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      1. POMultiple Parallel grep of big file using scala future not as speedy as required
      1. USStefan Kunze
    2. COWouldn't the await block the flow (which I don't want)?
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      1. USHarsh Gupta
    3. COBut you were implying your computation is based on a previous one?
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      1. POMultiple Parallel grep of big file using scala future not as speedy as required
      1. USStefan Kunze
 

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