我有一个性能用例,我需要在EntryProcessor中识别某些process()调用,这需要超过300毫秒.我尝试使用具有以下配置的SlowOperationDetector.
<!-- SlowOperation Detector Configuration -->
<property name="hazelcast.slow.operation.detector.enabled">true</property>
<property name="hazelcast.slow.operation.detector.stacktrace.logging.enabled">true</property>
<property name="hazelcast.slow.operation.detector.log.purge.interval.seconds">60000</property>
<property name="hazelcast.slow.operation.detector.log.retention.seconds">60000</property>
<property name="hazelcast.slow.operation.detector.threshold.millis">300</property>
我给出了一个示例测试代码,它在进程()内部休眠1秒钟.
public static void main(String args[])
{
Config cfg = null;
try {
cfg = new FileSystemXmlConfig("C:\\workarea\\hazelcast\\hazelcast-perf.xml");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance(cfg);
IMap<String, Employee> employeesMap = hazelcastInstance.getMap("anyMap");
employeesMap.put("100", new Employee(100));
SlowEntryProcessor slowEntryProcessor = new SlowEntryProcessor();
employeesMap.executeOnKey("100", slowEntryProcessor);
}
static public class SlowEntryProcessor implements EntryProcessor<String, Employee>
{
private static final long serialVersionUID = 1L;
@Override
public EntryBackupProcessor<String, Employee> getBackupProcessor()
{
return null;
}
@Override
public Object process(Entry<String, Employee> arg0)
{
System.out.println("About to sleep");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("done processing");
return null;
}
}
当配置的阈值小于1000毫秒时,我不会看到任何日志.所以在这个例子中,我没有看到任何缓慢的操作堆栈跟踪或日志.
如果我将睡眠时间更改为2秒,并将操作阈值降低至1秒,则慢速操作检测器启动并显示日志.
这是SlowOperationDetector中的错误还是我在这里遗漏了什么?
最佳答案 这不是一个bug;但设计.我们所做的是定期扫描当前正在执行的操作.所以这取决于扫描的频率.不打算使用慢速操作检测器(并且因此未设计)来检测这种短操作.它实际上是用于多秒操作执行.