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From phrocker <>
Subject [GitHub] accumulo pull request: ACCUMULO-3509: Allow cleanup state to be ke...
Date Mon, 04 Jan 2016 17:07:28 GMT
Github user phrocker commented on a diff in the pull request:
    --- Diff: server/tserver/src/main/java/org/apache/accumulo/tserver/tablet/
    @@ -38,100 +40,126 @@
       private ScanDataSource isolatedDataSource;
       private boolean sawException = false;
       private boolean scanClosed = false;
    +  protected Semaphore scannerSemaphore;
       Scanner(Tablet tablet, Range range, ScanOptions options) {
         this.tablet = tablet;
         this.range = range;
         this.options = options;
    +    scannerSemaphore = new Semaphore(1, true);
    -  public synchronized ScanBatch read() throws IOException, TabletClosedException {
    -    if (sawException)
    -      throw new IllegalStateException("Tried to use scanner after exception occurred.");
    +  public ScanBatch read() throws IOException, TabletClosedException {
         if (scanClosed)
    --- End diff --
    I made a typo when writing the patch from my other machine. I made the boolean volatile
there but in talking with you I will move the scanClosed below the acquisition to avoid the
issue entirely and ensure cache coherency. 

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