[HDDS-721] NullPointerException thrown while trying to read a file when datanode restarted

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 0.3.0
• Component/s: Ozone Datanode
• Target Version/s: 0.3.0
• Assignee: Shashikant Banerjee
• Reporter: Nilotpal Nandi
• Created: 24/Oct/18 05:00
• Updated: 30/Oct/18 14:16
• Resolved: 30/Oct/18 14:16

Description

steps taken :

-------------------

1. Put few files and directories using ozonefs
2. stopped all services of cluster.
3. started the scm, om and then datanodes.

While datanodes were starting up, tried to read a file. Null pointer Exception was thrown.

 

[root@ctr-e138-1518143905142-544443-01-000003 ~]# /root/hadoop_trunk/ozone-0.3.0-SNAPSHOT/bin/ozone fs -ls -R /
2018-10-24 04:48:00,703 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
drwxrwxrwx - root root 0 2018-10-24 04:12 /testdir1
-rw-rw-rw- 1 root root 5368709120 1970-02-25 15:29 /testdir1/5GB
-rw-rw-rw- 1 root root 4798 1970-02-25 15:22 /testdir1/passwd
drwxrwxrwx - root root 0 2018-10-24 04:46 /testdir3

[root@ctr-e138-1518143905142-544443-01-000003 ~]# /root/hadoop_trunk/ozone-0.3.0-SNAPSHOT/bin/ozone fs -cat o3fs://fs-bucket.fs-volume/testdir1/passwd
2018-10-24 04:49:24,955 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
cat: Exception getting XceiverClient: com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException