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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