Apache
/
hbase
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

HBASE-5641 decayingSampleTick1 prevents HBase from shutting down. 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1305722 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
larsh 2012-03-27 03:34:51 +00:00
parent 3fd6997380
commit ef65dde6b3
1 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/main/java/org/apache/hadoop/hbase/metrics/histogram/ExponentiallyDecayingSample.java
View File

@ -22,12 +22,12 @@ import java.util.Random;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.apache.hadoop.hbase.util.Threads;
/**
* An exponentially-decaying random sample of {@code long}s.
* Uses Cormode et al's forward-decaying priority reservoir sampling method
@ -44,7 +44,7 @@ public class ExponentiallyDecayingSample implements Sample {
private static final ScheduledExecutorService TICK_SERVICE =
Executors.newScheduledThreadPool(1,
Threads.getNamedThreadFactory("decayingSampleTick"));
getNamedDaemonThreadFactory("decayingSampleTick"));
private static volatile long CURRENT_TICK =
TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis());
@ -209,4 +209,18 @@ public class ExponentiallyDecayingSample implements Sample {
private void unlockForRegularUsage() {
lock.readLock().unlock();
}
private static ThreadFactory getNamedDaemonThreadFactory(final String prefix) {
return new ThreadFactory() {
private final AtomicInteger threadNumber = new AtomicInteger(1);
@Override
public Thread newThread(Runnable r) {
Thread t= new Thread(r, prefix + threadNumber.getAndIncrement());
t.setDaemon(true);
return t;
}
};
}
}