我想使用 ganglia 监控 Hadoop（Hadoop 版本-0.20.2）多节点集群。我的 Hadoop 工作正常。我在阅读以下博客后安装了 Ganglia ---
http://hakunamapdata.com/ganglia-configuration-for-a-small-hadoop-cluster-and-some-troubleshooting/
http://hokamblogs.blogspot.in/2013/06/ganglia-overview-and-installation-on.html
我还研究了使用 Ganglia.pdf 进行监控（附录 B Ganglia 和 Hadoop/HBase）。</p>
I have modified only the following lines in **Hadoop-metrics.properties**(same on all Hadoop Nodes)==>
// Configuration of the "dfs" context for ganglia
dfs.class=org.apache.hadoop.metrics.ganglia.GangliaContext
dfs.period=10
dfs.servers=192.168.1.182:8649
// Configuration of the "mapred" context for ganglia
mapred.class=org.apache.hadoop.metrics.ganglia.GangliaContext
mapred.period=10
mapred.servers=192.168.1.182:8649:8649
// Configuration of the "jvm" context for ganglia
jvm.class=org.apache.hadoop.metrics.ganglia.GangliaContext
jvm.period=10
jvm.servers=192.168.1.182:8649
**gmetad.conf** (Only on Hadoop master Node )
data_source "Hadoop-slaves" 5 192.168.1.182:8649
RRAs "RRA:AVERAGE:0.5:1:302400" //Because i want to analyse one week data.
**gmond.conf** (on all the Hadoop Slave nodes and Hadoop Master)
globals {
daemonize = yes
setuid = yes
user = ganglia
debug_level = 0
max_udp_msg_len = 1472
mute = no
deaf = no
allow_extra_data = yes
host_dmax = 0 /*secs */
cleanup_threshold = 300 /*secs */
gexec = no
send_metadata_interval = 0
}
cluster {
name = "Hadoop-slaves"
owner = "Sandeep Priyank"
latlong = "unspecified"
url = "unspecified"
}
/* The host section describes attributes of the host, like the location */
host {
location = "CASL"
}
/* Feel free to specify as many udp_send_channels as you like. Gmond
used to only support having a single channel */
udp_send_channel {
host = 192.168.1.182
port = 8649
ttl = 1
}
/* You can specify as many udp_recv_channels as you like as well. */
udp_recv_channel {
port = 8649
}
/* You can specify as many tcp_accept_channels as you like to share
an xml description of the state of the cluster */
tcp_accept_channel {
port = 8649
}
现在 Ganglia 只为所有节点提供系统指标（内存、磁盘等）。但它没有在 Web 界面上显示 Hadoop 指标（如 jvm、mapred 指标等）。我该如何解决这个问题？