[HDFS-4802] Disallowing snapshot on / twice throws error

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: Snapshot (HDFS-2802)
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Jing Zhao
• Reporter: Ramya Sunil
• Created: 06/May/13 17:39
• Updated: 08/May/13 13:08
• Resolved: 07/May/13 18:45

Description

$ hadoop dfsadmin -allowSnapshot
/Allowing snaphot on / succeeded

$ hadoop dfsadmin -disallowSnapshot /
Disallowing snaphot on / succeeded

$ hadoop dfsadmin -disallowSnapshot /
disallowSnapshot: java.io.IOException: java.lang.IllegalStateException: Error when removing a snapshottable dir: removed != to-be-removed

From the logs:

INFO org.apache.hadoop.ipc.Server: IPC Server handler 34 on 8020, call disallowSnapshot(/) from * error: java.io.IOException: java.lang.IllegalStateException: Error when removing a snapshottable dir: removed != to-be-removed
java.io.IOException: java.lang.IllegalStateException: Error when removing a snapshottable dir: removed != to-be-removed
        at org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager.removeSnapshottable(SnapshotManager.java:126)
        at org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager.resetSnapshottable(SnapshotManager.java:159)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.disallowSnapshot(FSNamesystem.java:6779)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.disallowSnapshot(NameNode.java:1545)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1405)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1401)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1399)