Kylin:控制台界面数据导出异常问题

问题描述

Kylin Web数据导出功能异常，数据无法导出

异常原因

 Note: further occurrences of HTTP request parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Request header is too large
	at org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:557)
	at org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:546)
	at org.apache.coyote.http11.InternalInputBuffer.parseRequestLine(InternalInputBuffer.java:176)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1108)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:654)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:319)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:750)

如上，为题原因为请求头太大

调整解决

异常日志显示是因为请求头太大，所以我们需要调整Kylin Tomcat请求头大小限制，修改tomcat server.xml配置文件，添加如下配置：

maxHttpHeaderSize ="102400

修改位置：

<Connector port="7070" protocol="HTTP/1.1"
           connectionTimeout="20000"
           redirectPort="7443"
           compression="on"
           compressionMinSize="2048"
           noCompressionUserAgents="gozilla,traviata"
           compressableMimeType="text/html,text/xml,text/javascript,application/javascript,application/json,text/css,text/plain"
           URIEncoding="UTF-8"
           maxHttpHeaderSize ="102400"
/>

如果走了Nginx，nginx同时需要调整：
在nginx.conf的http段中加入以下参数：

client_header_buffer_size 512k;
large_client_header_buffers 4 512k;
client_max_body_size 100m;