We have a muith-thread program to put data into base . Each thread news an
instance of a HTable ,because they put data into different HTable.
But today we find that this program is stucked. After we stack this java
process,we found that one thread is stucked in
"pool-1-thread-9" prio=10 tid=0x00007fbb14036800 nid=0x4f7a waiting on
condition [0x00007fbb5d411000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at java.lang.Thread.sleep(Thread.java:302)
at java.util.concurrent.TimeUnit.sleep(TimeUnit.java:328)
at
org.apache.hadoop.hbase.util.RetryCounter.sleepUntilNextRetry(RetryCounter.java:54)
at
org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.getData(RecoverableZooKeeper.java:277)
at
org.apache.hadoop.hbase.zookeeper.ZKUtil.getDataInternal(ZKUtil.java:522)
at
org.apache.hadoop.hbase.zookeeper.ZKUtil.getDataAndWatch(ZKUtil.java:498)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.getData(ZooKeeperNodeTracker.java:156)
- locked <0x000000067bc07738> (a
org.apache.hadoop.hbase.zookeeper.RootRegionTracker)
at
org.apache.hadoop.hbase.zookeeper.RootRegionTracker.getRootRegionLocation(RootRegionTracker.java:62)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:821)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:801)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:933)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:832)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:801)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:933)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:836)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:801)
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:238)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:178)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:137)
at com.xingcloud.server.task.EventTask.run(EventTask.java:65)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
And other threads are waiting this lock.
"pool-1-thread-7" prio=10 tid=0x00007fbb14032800 nid=0x4f76 waiting for monitor
entry [0x00007fbb5d493000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.getData(ZooKeeperNodeTracker.java:154)
- waiting to lock <0x000000067bc07738> (a
org.apache.hadoop.hbase.zookeeper.RootRegionTracker)
at
org.apache.hadoop.hbase.zookeeper.RootRegionTracker.getRootRegionLocation(RootRegionTracker.java:62)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:821)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:801)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:933)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:832)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:801)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:933)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:836)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:801)
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:238)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:178)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:137)
at com.xingcloud.server.task.EventTask.run(EventTask.java:65)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
I checked the base code of
org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.getData(RecoverableZooKeeper.java:277)
public byte[] getData(String path, Watcher watcher, Stat stat)
throws KeeperException, InterruptedException {
RetryCounter retryCounter = retryCounterFactory.create();
while (true) {
try {
byte[] revData = zk.getData(path, watcher, stat);
return this.removeMetaData(revData);
} catch (KeeperException e) {
switch (e.code()) {
case CONNECTIONLOSS:
case OPERATIONTIMEOUT:
retryOrThrow(retryCounter, e, "getData");
break;
default:
throw e;
}
}
retryCounter.sleepUntilNextRetry();
retryCounter.useRetry();
}
}
I guess the KeeperException.code is CONNECTIONLOSS , this error code causes
this stucked thing happened.
Why this error code is CONNECTIONLOSS?
And i restart this client program ,this situation still happens. To solve this,
must i restart HBase?
Thanks!
