[GitHub] [cloudstack] nvazquez commented on issue #3264: Volume snapshot listing failing when originating primary pool removed

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nvazquez commented on issue #3264: Volume snapshot listing failing when 
originating primary pool removed
URL: https://github.com/apache/cloudstack/issues/3264#issuecomment-480329760
 
 
   Error is NullPointerException on `StorageSubsystemSnapshotStrategy`, as the 
pool is removed, this line returns an empty pool: 
https://github.com/apache/cloudstack/blob/4.11.2.0/engine/storage/snapshot/src/org/apache/cloudstack/storage/snapshot/StorageSystemSnapshotStrategy.java#L976
   
   ````
   2019-04-05 13:48:39,507 ERROR [c.c.a.ApiServer] 
(qtp788117692-12:ctx-817b96c3 ctx-5c399d14) (logid:9277d33d) unhandled 
exception executing api command: [Ljava.lang.String;@2829384
   java.lang.NullPointerException
           at 
org.apache.cloudstack.storage.snapshot.StorageSystemSnapshotStrategy.canHandle(StorageSystemSnapshotStrategy.java:978)
           at 
org.apache.cloudstack.storage.helper.StorageStrategyFactoryImpl$3.canHandle(StorageStrategyFactoryImpl.java:72)
           at 
org.apache.cloudstack.storage.helper.StorageStrategyFactoryImpl$3.canHandle(StorageStrategyFactoryImpl.java:69)
           at 
org.apache.cloudstack.storage.helper.StorageStrategyFactoryImpl.bestMatch(StorageStrategyFactoryImpl.java:95)
           at 
org.apache.cloudstack.storage.helper.StorageStrategyFactoryImpl.getSnapshotStrategy(StorageStrategyFactoryImpl.java:69)
           at 
org.apache.cloudstack.storage.snapshot.SnapshotObject.isRevertable(SnapshotObject.java:134)
           at 
com.cloud.api.ApiResponseHelper.createSnapshotResponse(ApiResponseHelper.java:536)
           at 
org.apache.cloudstack.api.command.user.snapshot.ListSnapshotsCmd.execute(ListSnapshotsCmd.java:117)
           at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:150)
           at com.cloud.api.ApiServer.queueCommand(ApiServer.java:732)
   ````
   
   Possible workarounds:
   - Remove the entry on `snapshot_store_ref` with store_role = Primary for 
conflicting snapshot.
   - Update the pool_id column on `snapshot_store_ref` for conflicting snapshot 
to a non-removed pool id.

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