kangkaisen opened a new issue #1393: Schema change job could not finished URL: https://github.com/apache/incubator-doris/issues/1393 **Describe the bug** Just now， our user found a schema change job run a long time:  I found: 1 The clear alter task run successfully in BE 2 FE continuous send clear schema change job to BE: ``` 2019-06-26 16:40:28,809 INFO 29 [SchemaChangeHandler.runOneCycle():1145] schema change job has finished, send clear tasks to all b e SchemaChangeJob [tableName=app_dt__poi_cis_matched, type=schema change, state=FINISHING, dbId=10004, tableId=111004980, transact ionId=312527717, isPreviousLoadFinished=true, createTime=1561532629855, finishedTime=-1] 2019-06-26 16:40:28,830 INFO 29 [SchemaChangeJob.checkOrResendClearTasks():332] sending clear schema change job tasks for table [1 11004980] 2019-06-26 16:40:28,841 INFO 29 [SchemaChangeJob.checkOrResendClearTasks():364] successfully sending clear schema change job [1110 04980] ``` 3 FE cannot find some clear alter task: ``` 2019-06-26 16:49:10,045 WARN 1620 [MasterImpl.finishTask():122] cannot find task. type: CLEAR_ALTER_TASK, backendId: 18710, signat ure: 111071104 2019-06-26 16:49:10,046 WARN 293815 [MasterImpl.finishTask():122] cannot find task. type: CLEAR_ALTER_TASK, backendId: 63256540, s ignature: 111054732 2019-06-26 16:49:10,047 WARN 2357 [MasterImpl.finishTask():122] cannot find task. type: CLEAR_ALTER_TASK, backendId: 18710, signat ure: 111067009 2019-06-26 16:49:10,048 WARN 1951 [MasterImpl.finishTask():122] cannot find task. type: CLEAR_ALTER_TASK, backendId: 63256540, sig nature: 111052684 2019-06-26 16:49:10,049 WARN 3968 [MasterImpl.finishTask():122] cannot find task. type: CLEAR_ALTER_TASK, backendId: 18710, signat ure: 111058817 ```
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