[HDFS-7431] log message for InvalidMagicNumberException may be incorrect

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.7.0
• Component/s: security
• Target Version/s: 2.7.0
• Hadoop Flags: Reviewed
• Assignee: Yi Liu
• Reporter: Yi Liu
• Created: 24/Nov/14 06:44
• Updated: 10/Apr/15 20:30
• Resolved: 18/Dec/14 23:08

Description

For security mode, HDFS now supports that Datanodes don't require root or jsvc if dfs.data.transfer.protection is configured.

Log message for InvalidMagicNumberException, we miss one case:
when the datanodes run on unprivileged port and dfs.data.transfer.protection is configured to authentication but dfs.encrypt.data.transfer is not configured. SASL handshake is required and a low version dfs client is used, then InvalidMagicNumberException is thrown and we write log:

Failed to read expected encryption handshake from client at .... Perhaps the client is running an older version of Hadoop which does not support encryption

Recently I run HDFS built on trunk and security is enabled, but the client is 2.5.1 version. Then I got the above log message, but actually I have not configured encryption.

Issue Links

• relates to: HDFS-7313 Support optional configuration of AES cipher suite on DataTransferProtocol.