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https://issues.apache.org/jira/browse/HDFS-13485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16444648#comment-16444648
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Kihwal Lee edited comment on HDFS-13485 at 4/19/18 7:08 PM:
------------------------------------------------------------
That's not web ui. We could make it fail more gracefully when required
parameters are not provided in the request. However, datanode webhdfs server
is not meant to be a user-facing entry point.
was (Author: kihwal):
That's not web ui. We could make it fail more gracefully when required
parameters are not provided in the request.
> DataNode WebUI throws NPE
> -------------------------
>
> Key: HDFS-13485
> URL: https://issues.apache.org/jira/browse/HDFS-13485
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, webhdfs
> Affects Versions: 3.0.0
> Environment: Kerberized. Hadoop 3.0.0, WebHDFS.
> Reporter: Wei-Chiu Chuang
> Priority: Minor
>
> curl -k -i --negotiate -u : "https://hadoop3-4.example.com:20004/webhdfs/v1";
> DataNode Web UI should do a better error checking/handling.
> {noformat}
> 2018-04-19 10:07:49,338 WARN
> org.apache.hadoop.hdfs.server.datanode.web.webhdfs.WebHdfsHandler:
> INTERNAL_SERVER_ERROR
> java.lang.NullPointerException
> at
> org.apache.hadoop.security.token.Token.decodeWritable(Token.java:364)
> at
> org.apache.hadoop.security.token.Token.decodeFromUrlString(Token.java:383)
> at
> org.apache.hadoop.hdfs.server.datanode.web.webhdfs.ParameterParser.delegationToken(ParameterParser.java:128)
> at
> org.apache.hadoop.hdfs.server.datanode.web.webhdfs.DataNodeUGIProvider.ugi(DataNodeUGIProvider.java:76)
> at
> org.apache.hadoop.hdfs.server.datanode.web.webhdfs.WebHdfsHandler.channelRead0(WebHdfsHandler.java:129)
> at
> org.apache.hadoop.hdfs.server.datanode.web.URLDispatcher.channelRead0(URLDispatcher.java:51)
> at
> org.apache.hadoop.hdfs.server.datanode.web.URLDispatcher.channelRead0(URLDispatcher.java:31)
> at
> com.cloudera.io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
> at
> com.cloudera.io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
> at
> com.cloudera.io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310)
> at
> com.cloudera.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
> at
> com.cloudera.io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1379)
> at
> com.cloudera.io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1158)
> at
> com.cloudera.io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1193)
> at
> com.cloudera.io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489)
> at
> com.cloudera.io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:428)
> at
> com.cloudera.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
> at
> com.cloudera.io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1359)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
> at
> com.cloudera.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
> at
> com.cloudera.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:935)
> at
> com.cloudera.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:138)
> at
> com.cloudera.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645)
> at
> com.cloudera.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
> at
> com.cloudera.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
> at
> com.cloudera.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
> at
> com.cloudera.io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
> at
> com.cloudera.io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
> at java.lang.Thread.run(Thread.java:748)
> {noformat}
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