HBASE-12148 Remove TimeRangeTracker as point of contention when many threads writing a Store

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stack 2014-10-02 12:39:33 -07:00
parent 129b93bc0e
commit 8ac42d4b40
1 changed files with 111 additions and 0 deletions

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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.regionserver;
import static org.junit.Assert.assertTrue;
import org.apache.hadoop.hbase.io.TimeRange;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.apache.hadoop.hbase.testclassification.RegionServerTests;
import org.junit.Test;
import org.junit.experimental.categories.Category;
@Category({RegionServerTests.class, SmallTests.class})
public class TestTimeRangeTracker {
@Test
public void testAlwaysDecrementingSetsMaximum() {
TimeRangeTracker trr = new TimeRangeTracker();
trr.includeTimestamp(3);
trr.includeTimestamp(2);
trr.includeTimestamp(1);
assertTrue(trr.getMinimumTimestamp() != TimeRangeTracker.INITIAL_MINIMUM_TIMESTAMP);
assertTrue(trr.getMaximumTimestamp() != -1 /*The initial max value*/);
}
@Test
public void testSimpleInRange() {
TimeRangeTracker trr = new TimeRangeTracker();
trr.includeTimestamp(0);
trr.includeTimestamp(2);
assertTrue(trr.includesTimeRange(new TimeRange(1)));
}
/**
* Run a bunch of threads against a single TimeRangeTracker and ensure we arrive
* at right range. Here we do ten threads each incrementing over 100k at an offset
* of the thread index; max is 10 * 10k and min is 0.
* @throws InterruptedException
*/
@Test
public void testArriveAtRightAnswer() throws InterruptedException {
final TimeRangeTracker trr = new TimeRangeTracker();
final int threadCount = 10;
final int calls = 1000 * 1000;
Thread [] threads = new Thread[threadCount];
for (int i = 0; i < threads.length; i++) {
Thread t = new Thread("" + i) {
@Override
public void run() {
int offset = Integer.parseInt(getName());
boolean even = offset % 2 == 0;
if (even) {
for (int i = (offset * calls); i < calls; i++) trr.includeTimestamp(i);
} else {
int base = offset * calls;
for (int i = base + calls; i >= base; i--) trr.includeTimestamp(i);
}
}
};
t.start();
threads[i] = t;
}
for (int i = 0; i < threads.length; i++) {
threads[i].join();
}
assertTrue(trr.getMaximumTimestamp() == calls * threadCount);
assertTrue(trr.getMinimumTimestamp() == 0);
}
/**
* Bit of code to test concurrent access on this class.
* @param args
* @throws InterruptedException
*/
public static void main(String[] args) throws InterruptedException {
long start = System.currentTimeMillis();
final TimeRangeTracker trr = new TimeRangeTracker();
final int threadCount = 5;
final int calls = 1024 * 1024 * 128;
Thread [] threads = new Thread[threadCount];
for (int i = 0; i < threads.length; i++) {
Thread t = new Thread("" + i) {
@Override
public void run() {
for (int i = 0; i < calls; i++) trr.includeTimestamp(i);
}
};
t.start();
threads[i] = t;
}
for (int i = 0; i < threads.length; i++) {
threads[i].join();
}
System.out.println(trr.getMinimumTimestamp() + " " + trr.getMaximumTimestamp() + " " +
(System.currentTimeMillis() - start));
}
}