Yi Liu created HDFS-7431:
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Summary: log message for InvalidMagicNumberException may be
incorrect
Key: HDFS-7431
URL: https://issues.apache.org/jira/browse/HDFS-7431
Project: Hadoop HDFS
Issue Type: Bug
Components: security
Reporter: Yi Liu
Assignee: Yi Liu
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.
But a low version dfs client is used, then {{InvalidMagicNumberException}} is
thrown with log:
{quote}
Failed to read expected encryption handshake from client at .... Perhaps the
client is running an older version of Hadoop which does not support encryption
{quote}
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.
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