[jira] [Created] (HDFS-15446) CreateSnapshotOp fails during edit log loading for /.reserved/raw/path with error java.io.FileNotFoundException: Directory does not exist: /.reserved/raw/path

["Srinivasu Majeti (Jira)" <ji...@apache.org>]

Srinivasu Majeti created HDFS-15446:
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             Summary: CreateSnapshotOp fails during edit log loading for /.reserved/raw/path with error java.io.FileNotFoundException: Directory does not exist: /.reserved/raw/path 
                 Key: HDFS-15446
                 URL: https://issues.apache.org/jira/browse/HDFS-15446
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs
    Affects Versions: 3.2.0, 3.3.0
            Reporter: Srinivasu Majeti
            Assignee: Stephen O'Donnell


After allowing snapshot creation for a path say /app-logs , when we try to create snapshot on 
 /.reserved/raw/app-logs , its successful with snapshot creation but later when Standby Namenode is restarted and tries to load the edit record OP_CREATE_SNAPSHOT , we see it failing and Standby Namenode shuts down with an exception "ava.io.FileNotFoundException: Directory does not exist: /.reserved/raw/app-logs" .

Here are the steps to reproduce :
{code:java}
# hdfs dfs -ls /.reserved/raw/
Found 15 items
drwxrwxrwt   - yarn   hadoop          0 2020-06-29 10:27 /.reserved/raw/app-logs
drwxr-xr-x   - hive   hadoop          0 2020-06-29 10:29 /.reserved/raw/prod
++++++++++++++
[root@c3230-node2 ~]# hdfs dfsadmin -allowSnapshot /app-logs
Allowing snapshot on /app-logs succeeded
[root@c3230-node2 ~]# hdfs dfsadmin -allowSnapshot /prod
Allowing snapshot on /prod succeeded
++++++++++++++
# hdfs lsSnapshottableDir
drwxrwxrwt 0 yarn hadoop 0 2020-06-29 10:27 1 65536 /app-logs
drwxr-xr-x 0 hive hadoop 0 2020-06-29 10:29 1 65536 /prod
++++++++++++++
[root@c3230-node2 ~]# hdfs dfs -createSnapshot /.reserved/raw/app-logs testSS
Created snapshot /.reserved/raw/app-logs/.snapshot/testSS
{code}
Exception we see in Standby namenode while loading the snapshot creation edit record.
{code:java}
2020-06-29 10:33:25,488 ERROR namenode.NameNode (NameNode.java:main(1715)) - Failed to start namenode.
java.io.FileNotFoundException: Directory does not exist: /.reserved/raw/app-logs
        at org.apache.hadoop.hdfs.server.namenode.INodeDirectory.valueOf(INodeDirectory.java:60)
        at org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager.getSnapshottableRoot(SnapshotManager.java:259)
        at org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager.createSnapshot(SnapshotManager.java:307)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.applyEditLogOp(FSEditLogLoader.java:772)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:257)
{code}



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