// Let's test for negative delta's or a system that is slower than others in the cluster
@Test
public void testSafeQueryTimeForASlowNode() {
IndexManager.resetIndexBufferTime();
// fake entry update at LMT of 0 and actual time of 10
// safe query time set in index manager is going to be -10
assertTrue(IndexManager.setIndexBufferTime(210, 200));
assertFalse(IndexManager.needsRecalculation(200, 190));
assertFalse(IndexManager.needsRecalculation(200, 200));
assertTrue(IndexManager.needsRecalculation(200, 210));
assertTrue(IndexManager.needsRecalculation(200, 220));
assertTrue(IndexManager.needsRecalculation(200, 221));
// now lets say an entry updates with no delta
assertTrue(IndexManager.setIndexBufferTime(210, 210));
assertTrue(IndexManager.needsRecalculation(200, 190));
assertTrue(IndexManager.needsRecalculation(200, 200));
assertTrue(IndexManager.needsRecalculation(200, 210));
assertTrue(IndexManager.needsRecalculation(200, 220));
assertTrue(IndexManager.needsRecalculation(200, 221));
assertTrue(IndexManager.needsRecalculation(210, 211));
assertFalse(IndexManager.needsRecalculation(212, 210));
}
/**
* This test is for a fix for #47475 We added a way to determine whether to reevaluate an entry
* for query execution The method is to keep track of the delta and current time in a single long
* value The value is then used by the query to determine if a region entry needs to be
* reevaluated based on subtracting the value with the query execution time. This provides a delta
* + some false positive time If the delta + last modified time of the region entry is > query
* start time, we can assume that it needs to be reevaluated
*/
@Test
public void testSafeQueryTime() {
IndexManager.resetIndexBufferTime();
// fake entry update at LMT of 0 and actual time of 10
// safe query time set in index manager is going to be 20
assertTrue(IndexManager.setIndexBufferTime(0, 10));
// fake query start at actual time of 9, 10, 11 and using the fake LMT of 0
assertTrue(IndexManager.needsRecalculation(9, 0));
assertTrue(IndexManager.needsRecalculation(10, 0));
assertFalse(IndexManager.needsRecalculation(11, 0));
assertFalse(
IndexManager.needsRecalculation(9, -3)); // old enough updates shouldn't trigger a recalc
assertTrue(
IndexManager.needsRecalculation(
9, -2)); // older updates but falls within the delta (false positive)
assertTrue(IndexManager.needsRecalculation(10, 5));
// This should eval to true only because of false positives.
assertTrue(IndexManager.needsRecalculation(11, 5));
// Now let's assume a new update has occurred, this update delta and time combo still is not
// larger
assertFalse(IndexManager.setIndexBufferTime(0, 9));
assertFalse(IndexManager.setIndexBufferTime(1, 10));
// Now let's assume a new update has occured where the time is larger (enough to roll off the
// large delta)
// but the delta is smaller
assertTrue(IndexManager.setIndexBufferTime(30, 30));
// Now that we have a small delta, let's see if a query that was "stuck" would reevaluate
// appropriately
assertTrue(IndexManager.needsRecalculation(9, 0));
}