[HDDS-10421] [Snapshot] OM corruption due to NullPointerException

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Component/s: Snapshot
• Labels: ozone-snapshot
• Assignee: Unassigned
• Reporter: Jyotirmoy Sinha
• Created: 26/Feb/24 05:27
• Updated: 28/Feb/24 17:24
• Resolved: 28/Feb/24 17:19

Description

Scenario :

• Generate data over parallel threads over various volume/buckets
• Perform parallel snapshot create/delete/list operations over above buckets
• Perform parallel snapdiff operations over each bucket
• Perform parallel read operations of snapshot contents

Nullpointer exception in OM logs -

2024-02-14 21:50:59,574 [OM StateMachine ApplyTransaction Thread - 0] WARN org.apache.hadoop.ozone.om.snapshot.SnapshotCache: Key: '/vol-yu9w1/buck-kmkp4/snap1707922796' does not exist in cache.
2024-02-14 21:50:59,907 [OM StateMachine ApplyTransaction Thread - 0] ERROR org.apache.hadoop.ozone.om.ratis.OzoneManagerStateMachine: Terminating with exit status 1: Request cmdType: SnapshotPurge
clientId: "client-62D7790F8E6C"
SnapshotPurgeRequest {
  snapshotDBKeys: "/vol-yu9w1/buck-kmkp4/snap1707922796"
}
 failed with exception
java.lang.NullPointerException
        at org.apache.hadoop.ozone.om.snapshot.SnapshotUtils.getNextActiveSnapshot(SnapshotUtils.java:152)
        at org.apache.hadoop.ozone.om.request.snapshot.OMSnapshotPurgeRequest.validateAndUpdateCache(OMSnapshotPurgeRequest.java:99)
        at org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.handleWriteRequest(OzoneManagerRequestHandler.java:375)
        at org.apache.hadoop.ozone.om.ratis.OzoneManagerStateMachine.runCommand(OzoneManagerStateMachine.java:568)
        at org.apache.hadoop.ozone.om.ratis.OzoneManagerStateMachine.lambda$1(OzoneManagerStateMachine.java:359)
        at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1604)
        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)
2024-02-14 21:50:59,912 [shutdown-hook-0] INFO org.apache.ranger.audit.provider.AuditProviderFactory: ==> JVMShutdownHook.run() 

Issue Links

• duplicates: HDDS-10408 NPE causes OM crash in Snapshot Purge request