Aravindan Vijayan created HDDS-2200:
---------------------------------------

             Summary: Recon does not handle the NULL snapshot from OM DB 
cleanly.
                 Key: HDDS-2200
                 URL: https://issues.apache.org/jira/browse/HDDS-2200
             Project: Hadoop Distributed Data Store
          Issue Type: Bug
          Components: Ozone Recon
            Reporter: Aravindan Vijayan
            Assignee: Aravindan Vijayan


{code}
2019-09-27 11:35:19,835 [pool-9-thread-1] ERROR      - Null snapshot location 
got from OM.
2019-09-27 11:35:19,839 [pool-9-thread-1] INFO       - Calling reprocess on 
Recon tasks.
2019-09-27 11:35:19,840 [pool-7-thread-1] INFO       - Starting a 'reprocess' 
run of ContainerKeyMapperTask.
2019-09-27 11:35:20,069 [pool-7-thread-1] INFO       - Creating new Recon 
Container DB at /tmp/recon/db/recon-container.db_1569609319840
2019-09-27 11:35:20,069 [pool-7-thread-1] INFO       - Cleaning up old Recon 
Container DB at /tmp/recon/db/recon-container.db_1569609258721.
2019-09-27 11:35:20,144 [pool-9-thread-1] ERROR      - Unexpected error :
java.util.concurrent.ExecutionException: java.lang.NullPointerException
        at java.util.concurrent.FutureTask.report(FutureTask.java:122)
        at java.util.concurrent.FutureTask.get(FutureTask.java:192)
        at 
org.apache.hadoop.ozone.recon.tasks.ReconTaskControllerImpl.reInitializeTasks(ReconTaskControllerImpl.java:181)
        at 
org.apache.hadoop.ozone.recon.spi.impl.OzoneManagerServiceProviderImpl.syncDataFromOM(OzoneManagerServiceProviderImpl.java:333)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
        at 
org.apache.hadoop.ozone.recon.tasks.ContainerKeyMapperTask.reprocess(ContainerKeyMapperTask.java:81)
        at 
org.apache.hadoop.ozone.recon.tasks.ReconTaskControllerImpl.lambda$reInitializeTasks$3(ReconTaskControllerImpl.java:176)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
{code}



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