```
java.lang.IndexOutOfBoundsException: Index: 2, Size: 1
at java.util.ArrayList.rangeCheck(ArrayList.java:659)
at java.util.ArrayList.get(ArrayList.java:435)
at com.aliyun.emr.rss.service.deploy.master.clustermeta.AbstractMetaManager.updateReleaseSlotsMeta(AbstractMetaManager.java:104)
at com.aliyun.emr.rss.service.deploy.master.clustermeta.SingleMasterMetaManager.handleReleaseSlots(SingleMasterMetaManager.java:53)
at com.aliyun.emr.rss.service.deploy.master.Master.handleReleaseSlots(Master.scala:456)
at com.aliyun.emr.rss.service.deploy.master.Master$$anonfun$receiveAndReply$1.$anonfun$applyOrElse$12(Master.scala:189)
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
at com.aliyun.emr.rss.service.deploy.master.Master.executeWithLeaderChecker(Master.scala:156)
at com.aliyun.emr.rss.service.deploy.master.Master$$anonfun$receiveAndReply$1.applyOrElse(Master.scala:189)
at com.aliyun.emr.rss.common.rpc.netty.Inbox.$anonfun$process$1(Inbox.scala:110)
at com.aliyun.emr.rss.common.rpc.netty.Inbox.safelyCall(Inbox.scala:214)
at com.aliyun.emr.rss.common.rpc.netty.Inbox.process(Inbox.scala:107)
at com.aliyun.emr.rss.common.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:222)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)
```
