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From GitBox <...@apache.org>
Subject [GitHub] [storm] bipinprasad commented on a change in pull request #3136: [STORM-3519] Change ConstraintSolverStrategy::backtrackSearch to iteration
Date Mon, 14 Oct 2019 16:25:51 GMT
bipinprasad commented on a change in pull request #3136: [STORM-3519] Change ConstraintSolverStrategy::backtrackSearch
to iteration
URL: https://github.com/apache/storm/pull/3136#discussion_r334562680
 
 

 ##########
 File path: storm-server/src/main/java/org/apache/storm/scheduler/resource/strategies/scheduling/ConstraintSolverStrategy.java
 ##########
 @@ -320,51 +320,101 @@ private boolean checkSchedulingFeasibility(int maxStateSearch) {
         return GenericResourceAwareStrategy.sortObjectResourcesImpl(allResources, exec, topologyDetails,
existingScheduleFunc);
     }
 
-    // Backtracking algorithm does not take into account the ordering of executors in worker
to reduce traversal space
+    /**
+     * Try to schedule till successful or till limits (backtrack count or time) have been
exceeded.
+     *
+     * @param state terminal state of the executor assignment.
+     * @return SolverResult with success attribute set to true or false indicting whether
ALL executors were assigned.
+     */
     @VisibleForTesting
     protected SolverResult backtrackSearch(SearcherState state) {
-        state.incStatesSearched();
-        if (state.areSearchLimitsExceeded()) {
-            LOG.warn("Limits Exceeded");
-            return new SolverResult(state, false);
-        }
+        long         startTimeMilli     = System.currentTimeMillis();
 
 Review comment:
   We need real time here therefore the use of System. Time.currentTimeMillis() does not give
actual time, but time that can be manipulated by mock (used in test)

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