HDFS-10423. Increase default value of httpfs maxHttpHeaderSize. Contributed by Nicolae Popa.

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/conf/httpfs-env.sh

@@ -38,6 +38,10 @@
 #
 # export HTTPFS_HTTP_HOSTNAME=$(hostname -f)
 
+# The maximum size of Tomcat HTTP header
+#
+# export HTTPFS_MAX_HTTP_HEADER_SIZE=65536
+
 # The location of the SSL keystore if using SSL
 #
 # export HTTPFS_SSL_KEYSTORE_FILE=${HOME}/.keystore

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/libexec/httpfs-config.sh

@@ -42,6 +42,7 @@ function hadoop_subproject_init
   export HADOOP_CATALINA_HTTP_PORT="${HTTPFS_HTTP_PORT:-14000}"
   export HADOOP_CATALINA_ADMIN_PORT="${HTTPFS_ADMIN_PORT:-$((HADOOP_CATALINA_HTTP_PORT+1))}"
   export HADOOP_CATALINA_MAX_THREADS="${HTTPFS_MAX_THREADS:-150}"
+  export HADOOP_CATALINA_MAX_HTTP_HEADER_SIZE="${HTTPFS_MAX_HTTP_HEADER_SIZE:-65536}"
 
   export HTTPFS_SSL_ENABLED=${HTTPFS_SSL_ENABLED:-false}
 

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/tomcat/server.xml

@@ -71,6 +71,7 @@
     -->
     <Connector port="${httpfs.http.port}" protocol="HTTP/1.1"
                connectionTimeout="20000"
+               maxHttpHeaderSize="${httpfs.max.http.header.size}"
                redirectPort="8443"/>
     <!-- A "Connector" using the shared thread pool-->
     <!--

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/tomcat/ssl-server.xml.conf

@@ -70,6 +70,7 @@
          described in the APR documentation -->
     <Connector port="${httpfs.http.port}" protocol="HTTP/1.1" SSLEnabled="true"
                maxThreads="150" scheme="https" secure="true"
+               maxHttpHeaderSize="${httpfs.max.http.header.size}"
                clientAuth="false" sslEnabledProtocols="TLSv1,TLSv1.1,TLSv1.2,SSLv2Hello"
                keystoreFile="${httpfs.ssl.keystore.file}"
                keystorePass="_httpfs_ssl_keystore_pass_"/>

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/site/markdown/ServerSetup.md.vm

@@ -80,6 +80,8 @@ HttpFS preconfigures the HTTP and Admin ports in Tomcat's `server.xml` to 14000
 
 Tomcat logs are also preconfigured to go to HttpFS's `logs/` directory.
 
+HttpFS default value for the maxHttpHeaderSize parameter in Tomcat's `server.xml` is set to 65536 by default.
+
 The following environment variables (which can be set in HttpFS's `etc/hadoop/httpfs-env.sh` script) can be used to alter those values:
 
 * HTTPFS\_HTTP\_PORT
@@ -88,6 +90,8 @@ The following environment variables (which can be set in HttpFS's `etc/hadoop/ht
 
 * HADOOP\_LOG\_DIR
 
+* HTTPFS\_MAX\_HTTP\_HEADER\_SIZE
+
 HttpFS Configuration
 --------------------