[
https://issues.apache.org/jira/browse/HDDS-14699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Siyao Meng updated HDDS-14699:
------------------------------
Description:
In isSnapshotPurged() check, snapshot chain tableKey returning null should not
be the sole indicator for judging whether the snapshot is still active or not.
isSnapshotPurged() incorrectly returning true causes
checkOrphanSnapshotVersions() to incorrectly removing active snapshot's YAML
metadata (in OmSnapshotLocalDataManagerService runs). This in turn causes NPE
in CacheLoader when attempting to load the snapshot.
OM log example:
{code}
2026-02-16 09:47:40,047 INFO [IPC Server handler 92 on
9862]-org.apache.hadoop.ozone.om.snapshot.SnapshotCache: Loading SnapshotId:
'28d99c74-13d8-4a9d-91fe-7d0530ca84a3'
2026-02-16 09:47:40,050 WARN [IPC Server handler 92 on
9862]-org.apache.hadoop.ipc.Server: IPC Server handler 92 on 9862, call Call#2
Retry#0 org.apache.hadoop.ozone.om.protocol.OzoneManagerProtocol.submitRequest
from 10.65.50.249:55484
java.lang.IllegalStateException: java.lang.NullPointerException
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:217)
at
java.base/java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1947)
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.get(SnapshotCache.java:202)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:693)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:681)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveSnapshot(OmSnapshotManager.java:648)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveFsMetadataOrSnapshot(OmSnapshotManager.java:638)
at
org.apache.hadoop.ozone.om.OzoneManager.getReader(OzoneManager.java:5013)
at
org.apache.hadoop.ozone.om.OzoneManager.listStatus(OzoneManager.java:3874)
at
org.apache.hadoop.ozone.om.OzoneManager.listStatus(OzoneManager.java:3865)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.listStatus(OzoneManagerRequestHandler.java:1196)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.handleReadRequest(OzoneManagerRequestHandler.java:269)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitReadRequestToOM(OzoneManagerProtocolServerSideTranslatorPB.java:245)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.internalProcessRequest(OzoneManagerProtocolServerSideTranslatorPB.java:198)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.processRequest(OzoneManagerProtocolServerSideTranslatorPB.java:158)
at
org.apache.hadoop.hdds.server.OzoneProtocolMessageDispatcher.processRequest(OzoneProtocolMessageDispatcher.java:87)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitRequest(OzoneManagerProtocolServerSideTranslatorPB.java:148)
at
org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos$OzoneManagerService$2.callBlockingMethod(OzoneManagerProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:533)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1070)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:995)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:923)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1910)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2905)
Caused by: java.lang.NullPointerException
at
org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:404)
at
org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:1)
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:206)
... 25 more
{code}
Client log (client would keep retrying, but keep hitting the same NPE issue):
{code}
$ ozone fs -ls
ofs://ozone1771677192/vol-test-workload-om-decommission-recommission-1771689727/buck-test-workload-om-decommission-recommission-1771689727/.snapshot/snap-79xbc/
26/02/21 17:42:47 INFO retry.RetryInvocationHandler:
com.google.protobuf.ServiceException:
org.apache.hadoop.ipc.RemoteException(java.lang.IllegalStateException):
java.lang.NullPointerException
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:217)
at
java.base/java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1908)
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.get(SnapshotCache.java:202)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:693)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:681)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveSnapshot(OmSnapshotManager.java:648)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveFsMetadataOrSnapshot(OmSnapshotManager.java:638)
at
org.apache.hadoop.ozone.om.OzoneManager.getReader(OzoneManager.java:5013)
at
org.apache.hadoop.ozone.om.OzoneManager.getFileStatus(OzoneManager.java:3817)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.getOzoneFileStatus(OzoneManagerRequestHandler.java:1024)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.handleReadRequest(OzoneManagerRequestHandler.java:258)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitReadRequestToOM(OzoneManagerProtocolServerSideTranslatorPB.java:245)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.internalProcessRequest(OzoneManagerProtocolServerSideTranslatorPB.java:198)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.processRequest(OzoneManagerProtocolServerSideTranslatorPB.java:158)
at
org.apache.hadoop.hdds.server.OzoneProtocolMessageDispatcher.processRequest(OzoneProtocolMessageDispatcher.java:87)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitRequest(OzoneManagerProtocolServerSideTranslatorPB.java:148)
at
org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos$OzoneManagerService$2.callBlockingMethod(OzoneManagerProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:533)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1070)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:995)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:923)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1910)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2905)
Caused by: java.lang.NullPointerException
at
org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:404)
at
org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:1)
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:206)
... 24 more
{code}
was:
In isSnapshotPurged() check, snapshot chain tableKey returning null should not
be the sole indicator for judging whether the snapshot is still active or not.
isSnapshotPurged() incorrectly returning true causes
checkOrphanSnapshotVersions() to incorrectly removing active snapshot's YAML
metadata (in OmSnapshotLocalDataManagerService runs). This in turn causes NPE
in CacheLoader when attempting to load the snapshot.
OM log:
{code}
2026-02-16 09:47:40,047 INFO [IPC Server handler 92 on
9862]-org.apache.hadoop.ozone.om.snapshot.SnapshotCache: Loading SnapshotId:
'28d99c74-13d8-4a9d-91fe-7d0530ca84a3'
2026-02-16 09:47:40,050 WARN [IPC Server handler 92 on
9862]-org.apache.hadoop.ipc.Server: IPC Server handler 92 on 9862, call Call#2
Retry#0 org.apache.hadoop.ozone.om.protocol.OzoneManagerProtocol.submitRequest
from 10.65.50.249:55484
java.lang.IllegalStateException: java.lang.NullPointerException
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:217)
at
java.base/java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1947)
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.get(SnapshotCache.java:202)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:693)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:681)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveSnapshot(OmSnapshotManager.java:648)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveFsMetadataOrSnapshot(OmSnapshotManager.java:638)
at
org.apache.hadoop.ozone.om.OzoneManager.getReader(OzoneManager.java:5013)
at
org.apache.hadoop.ozone.om.OzoneManager.listStatus(OzoneManager.java:3874)
at
org.apache.hadoop.ozone.om.OzoneManager.listStatus(OzoneManager.java:3865)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.listStatus(OzoneManagerRequestHandler.java:1196)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.handleReadRequest(OzoneManagerRequestHandler.java:269)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitReadRequestToOM(OzoneManagerProtocolServerSideTranslatorPB.java:245)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.internalProcessRequest(OzoneManagerProtocolServerSideTranslatorPB.java:198)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.processRequest(OzoneManagerProtocolServerSideTranslatorPB.java:158)
at
org.apache.hadoop.hdds.server.OzoneProtocolMessageDispatcher.processRequest(OzoneProtocolMessageDispatcher.java:87)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitRequest(OzoneManagerProtocolServerSideTranslatorPB.java:148)
at
org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos$OzoneManagerService$2.callBlockingMethod(OzoneManagerProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:533)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1070)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:995)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:923)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1910)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2905)
Caused by: java.lang.NullPointerException
at
org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:404)
at
org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:1)
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:206)
... 25 more
{code}
Client log (client would keep retrying, but keep hitting the same NPE issue):
{code}
$ ozone fs -ls
ofs://ozone1771677192/vol-test-workload-om-decommission-recommission-1771689727/buck-test-workload-om-decommission-recommission-1771689727/.snapshot/snap-79xbc/
26/02/21 17:42:47 INFO retry.RetryInvocationHandler:
com.google.protobuf.ServiceException:
org.apache.hadoop.ipc.RemoteException(java.lang.IllegalStateException):
java.lang.NullPointerException
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:217)
at
java.base/java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1908)
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.get(SnapshotCache.java:202)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:693)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:681)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveSnapshot(OmSnapshotManager.java:648)
at
org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveFsMetadataOrSnapshot(OmSnapshotManager.java:638)
at
org.apache.hadoop.ozone.om.OzoneManager.getReader(OzoneManager.java:5013)
at
org.apache.hadoop.ozone.om.OzoneManager.getFileStatus(OzoneManager.java:3817)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.getOzoneFileStatus(OzoneManagerRequestHandler.java:1024)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.handleReadRequest(OzoneManagerRequestHandler.java:258)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitReadRequestToOM(OzoneManagerProtocolServerSideTranslatorPB.java:245)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.internalProcessRequest(OzoneManagerProtocolServerSideTranslatorPB.java:198)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.processRequest(OzoneManagerProtocolServerSideTranslatorPB.java:158)
at
org.apache.hadoop.hdds.server.OzoneProtocolMessageDispatcher.processRequest(OzoneProtocolMessageDispatcher.java:87)
at
org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitRequest(OzoneManagerProtocolServerSideTranslatorPB.java:148)
at
org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos$OzoneManagerService$2.callBlockingMethod(OzoneManagerProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:533)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1070)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:995)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:923)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1910)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2905)
Caused by: java.lang.NullPointerException
at
org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:404)
at
org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:1)
at
org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:206)
... 24 more
{code}
> Fix orphan snapshot versions handling when snapshot chain tableKey mapping is
> stale
> -----------------------------------------------------------------------------------
>
> Key: HDDS-14699
> URL: https://issues.apache.org/jira/browse/HDDS-14699
> Project: Apache Ozone
> Issue Type: Bug
> Components: Ozone Manager
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
>
> In isSnapshotPurged() check, snapshot chain tableKey returning null should
> not be the sole indicator for judging whether the snapshot is still active or
> not.
> isSnapshotPurged() incorrectly returning true causes
> checkOrphanSnapshotVersions() to incorrectly removing active snapshot's YAML
> metadata (in OmSnapshotLocalDataManagerService runs). This in turn causes NPE
> in CacheLoader when attempting to load the snapshot.
> OM log example:
> {code}
> 2026-02-16 09:47:40,047 INFO [IPC Server handler 92 on
> 9862]-org.apache.hadoop.ozone.om.snapshot.SnapshotCache: Loading SnapshotId:
> '28d99c74-13d8-4a9d-91fe-7d0530ca84a3'
> 2026-02-16 09:47:40,050 WARN [IPC Server handler 92 on
> 9862]-org.apache.hadoop.ipc.Server: IPC Server handler 92 on 9862, call
> Call#2 Retry#0
> org.apache.hadoop.ozone.om.protocol.OzoneManagerProtocol.submitRequest from
> 10.65.50.249:55484
> java.lang.IllegalStateException: java.lang.NullPointerException
> at
> org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:217)
> at
> java.base/java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1947)
> at
> org.apache.hadoop.ozone.om.snapshot.SnapshotCache.get(SnapshotCache.java:202)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:693)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:681)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveSnapshot(OmSnapshotManager.java:648)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveFsMetadataOrSnapshot(OmSnapshotManager.java:638)
> at
> org.apache.hadoop.ozone.om.OzoneManager.getReader(OzoneManager.java:5013)
> at
> org.apache.hadoop.ozone.om.OzoneManager.listStatus(OzoneManager.java:3874)
> at
> org.apache.hadoop.ozone.om.OzoneManager.listStatus(OzoneManager.java:3865)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.listStatus(OzoneManagerRequestHandler.java:1196)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.handleReadRequest(OzoneManagerRequestHandler.java:269)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitReadRequestToOM(OzoneManagerProtocolServerSideTranslatorPB.java:245)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.internalProcessRequest(OzoneManagerProtocolServerSideTranslatorPB.java:198)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.processRequest(OzoneManagerProtocolServerSideTranslatorPB.java:158)
> at
> org.apache.hadoop.hdds.server.OzoneProtocolMessageDispatcher.processRequest(OzoneProtocolMessageDispatcher.java:87)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitRequest(OzoneManagerProtocolServerSideTranslatorPB.java:148)
> at
> org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos$OzoneManagerService$2.callBlockingMethod(OzoneManagerProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:533)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1070)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:995)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:923)
> at java.base/java.security.AccessController.doPrivileged(Native Method)
> at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1910)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2905)
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:404)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:1)
> at
> org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:206)
> ... 25 more
> {code}
> Client log (client would keep retrying, but keep hitting the same NPE issue):
> {code}
> $ ozone fs -ls
> ofs://ozone1771677192/vol-test-workload-om-decommission-recommission-1771689727/buck-test-workload-om-decommission-recommission-1771689727/.snapshot/snap-79xbc/
> 26/02/21 17:42:47 INFO retry.RetryInvocationHandler:
> com.google.protobuf.ServiceException:
> org.apache.hadoop.ipc.RemoteException(java.lang.IllegalStateException):
> java.lang.NullPointerException
> at
> org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:217)
> at
> java.base/java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1908)
> at
> org.apache.hadoop.ozone.om.snapshot.SnapshotCache.get(SnapshotCache.java:202)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:693)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager.getSnapshot(OmSnapshotManager.java:681)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveSnapshot(OmSnapshotManager.java:648)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager.getActiveFsMetadataOrSnapshot(OmSnapshotManager.java:638)
> at
> org.apache.hadoop.ozone.om.OzoneManager.getReader(OzoneManager.java:5013)
> at
> org.apache.hadoop.ozone.om.OzoneManager.getFileStatus(OzoneManager.java:3817)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.getOzoneFileStatus(OzoneManagerRequestHandler.java:1024)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerRequestHandler.handleReadRequest(OzoneManagerRequestHandler.java:258)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitReadRequestToOM(OzoneManagerProtocolServerSideTranslatorPB.java:245)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.internalProcessRequest(OzoneManagerProtocolServerSideTranslatorPB.java:198)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.processRequest(OzoneManagerProtocolServerSideTranslatorPB.java:158)
> at
> org.apache.hadoop.hdds.server.OzoneProtocolMessageDispatcher.processRequest(OzoneProtocolMessageDispatcher.java:87)
> at
> org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB.submitRequest(OzoneManagerProtocolServerSideTranslatorPB.java:148)
> at
> org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos$OzoneManagerService$2.callBlockingMethod(OzoneManagerProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:533)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1070)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:995)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:923)
> at java.base/java.security.AccessController.doPrivileged(Native Method)
> at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1910)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2905)
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:404)
> at
> org.apache.hadoop.ozone.om.OmSnapshotManager$1.load(OmSnapshotManager.java:1)
> at
> org.apache.hadoop.ozone.om.snapshot.SnapshotCache.lambda$2(SnapshotCache.java:206)
> ... 24 more
> {code}
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