Github user keith-turner commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/60#discussion_r48753936
--- Diff:
server/tserver/src/main/java/org/apache/accumulo/tserver/tablet/Scanner.java ---
@@ -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);
--- End diff --
The expense of fairness may not be a problem. I suspect the expense of
fairness is an issue for semaphores that are frequently accessed by many
threads, which is not the case here.
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