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https://issues.apache.org/jira/browse/HADOOP-17011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17090979#comment-17090979
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Ayush Saxena commented on HADOOP-17011:
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I must say the title of this JIRA is so misguiding, Namenode crash gives a
feeling like Namenode dies in between post it has started working.
Well, Can’t see this is a bug actually since it is giving the correct exception
message and indeed the configuration is wrong. It can be seen as an
improvement, if it is required.
Any prominent reason for this?
> Trailing whitespace in fs.defaultFS will crash namenode and datanode
> --------------------------------------------------------------------
>
> Key: HADOOP-17011
> URL: https://issues.apache.org/jira/browse/HADOOP-17011
> Project: Hadoop Common
> Issue Type: Bug
> Components: common
> Reporter: Ctest
> Priority: Major
> Attachments: HADOOP-17011-001.patch
>
>
> *Problem:*
> Currently, `getDefaultUri` is using `conf.get` to get the value of
> `fs.defaultFS`, which means that the trailing whitespace after a valid URI
> won’t be removed and could stop namenode and datanode from starting up.
>
> *How to reproduce (Hadoop-2.8.5):*
> Set the configuration
> {code:java}
> <property>
> <name>fs.defaultFS</name>
> <value>hdfs://localhost:9000 </value>
> </property>{code}
> In core-site.xml (there is a whitespace after 9000) and start HDFS.
> Namenode and datanode won’t start and the log message is:
> {code:java}
> 2020-04-23 11:09:48,198 ERROR
> org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.
> java.lang.IllegalArgumentException: Illegal character in authority at index
> 7: hdfs://localhost:9000
> at java.net.URI.create(URI.java:852)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.setClientNamenodeAddress(NameNode.java:440)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:897)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:885)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1626)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1694)
> Caused by: java.net.URISyntaxException: Illegal character in authority at
> index 7: hdfs://localhost:9000
> at java.net.URI$Parser.fail(URI.java:2848)
> at java.net.URI$Parser.parseAuthority(URI.java:3186)
> at java.net.URI$Parser.parseHierarchical(URI.java:3097)
> at java.net.URI$Parser.parse(URI.java:3053)
> at java.net.URI.<init>(URI.java:588)
> at java.net.URI.create(URI.java:850)
> ... 5 more
> {code}
>
> *Solution:*
> Use `getTrimmed` instead of `get` for `fs.defaultFS`:
> {code:java}
> public static URI getDefaultUri(Configuration conf) {
> URI uri =
> URI.create(fixName(conf.getTrimmed(FS_DEFAULT_NAME_KEY, DEFAULT_FS)));
> if (uri.getScheme() == null) {
> throw new IllegalArgumentException("No scheme in default FS: " + uri);
> }
> return uri;
> }
> {code}
> I have submitted a patch for trunk about this.
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