acelyc111 opened a new issue #5612:
URL: https://github.com/apache/incubator-doris/issues/5612
**Describe the bug**
Add a column to a table, but the process blocked.
I found an exception on FE like:
```
2021-04-08 13:39:44,663 INFO (thrift-server-pool-613|804)
[AlterHandler.handleFinishAlterTask():451] before handle alter task tablet
481265671, replica: [replicaId=481265672, BackendId=62134593, version=1,
versionHash=0, dataSize=331285058, rowCount=1823157, lastFailedVersion=3,
lastFailedVersionHash=6798223064512349591, lastSuccessVersion=27,
lastSuccessVersionHash=5339720724553352740, lastFailedTimestamp=1617814890844,
schemaHash=80261792, state=ALTER], task version: 3-6798223064512349591
2021-04-08 13:39:44,664 WARN (thrift-server-pool-613|804)
[MasterImpl.finishTask():221] finish agent task error.
java.lang.IllegalStateException: 3
at
com.google.common.base.Preconditions.checkState(Preconditions.java:176)
~[jprotobuf-2.2.11-jar-with-dependencies.jar:?]
at
org.apache.doris.alter.AlterHandler.handleFinishAlterTask(AlterHandler.java:463)
~[palo-fe.jar:3.4.0]
at
org.apache.doris.master.MasterImpl.finishAlterTask(MasterImpl.java:847)
~[palo-fe.jar:3.4.0]
at
org.apache.doris.master.MasterImpl.finishTask(MasterImpl.java:210)
[palo-fe.jar:3.4.0]
at
org.apache.doris.service.FrontendServiceImpl.finishTask(FrontendServiceImpl.java:376)
[palo-fe.jar:3.4.0]
at
org.apache.doris.thrift.FrontendService$Processor$finishTask.getResult(FrontendService.java:1473)
[palo-fe.jar:3.4.0]
at
org.apache.doris.thrift.FrontendService$Processor$finishTask.getResult(FrontendService.java:1458)
[palo-fe.jar:3.4.0]
at
org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
[libthrift-0.9.3.jar:0.9.3]
at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
[libthrift-0.9.3.jar:0.9.3]
at
org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:286)
[libthrift-0.9.3.jar:0.9.3]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[?:?]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[?:?]
at java.lang.Thread.run(Thread.java:834) [?:?]
```
The new tablet's info can not be updated, and the process blocked.
Why we need this check in case 1?
```
if (replica.getVersion() > task.getVersion()) {
// Case 2.2, do nothing
} else {
if (replica.getLastFailedVersion() > task.getVersion()) {
// Case 2.1
replica.updateVersionInfo(task.getVersion(),
task.getVersionHash(), replica.getDataSize(), replica.getRowCount());
versionChanged = true;
} else {
// Case 1
Preconditions.checkState(replica.getLastFailedVersion()
== -1, replica.getLastFailedVersion()); // Why we need this check?
replica.updateVersionInfo(task.getVersion(),
task.getVersionHash(), replica.getDataSize(), replica.getRowCount());
versionChanged = true;
}
}
```
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