Hello list,

   I am using Chukwa-0.5.0 to collect data to HDFS and Hbase.All the
processes seem to be running fine but I am not able to see anything
happening on the HDFA and Hbase web interface.Need some guidance.Here
is the content of agent.log file -

 2011-12-19 03:56:59,936 INFO main Log4JMetricsContext -
Log4JMetricsContext.chukwaAgent.period=60
2011-12-19 03:57:00,052 INFO main ChukwaAgent - Config - CHUKWA_HOME:
[/home/saif/chukwa-incubating-0.5.0]
2011-12-19 03:57:00,052 INFO main ChukwaAgent - Config -
CHUKWA_CONF_DIR: [/home/saif/chukwa-incubating-0.5.0/etc/chukwa]
2011-12-19 03:57:00,354 INFO main ChukwaAgent - Config -
CHECKPOINT_BASE_NAME: [chukwa_agent_checkpoint]
2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config -
checkpointDir: [/home/saif/chukwa/log]
2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config -
CHECKPOINT_INTERVAL_MS: [5000]
2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config -
DO_CHECKPOINT_RESTORE: [true]
2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config -
STATS_INTERVAL_MS: [10000]
2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config - tags:
[cluster="chukwa"]
2011-12-19 03:57:00,355 INFO main ChukwaAgent - checkpoints are
enabled, period is 5000
2011-12-19 03:57:00,356 INFO main ChukwaAgent - No checkpoints found
in /home/saif/chukwa/log
2011-12-19 03:57:00,356 INFO main ChukwaAgent - starting adaptors
listed in /home/saif/chukwa-incubating-0.5.0/etc/chukwa/initial_adaptors
2011-12-19 03:57:00,450 INFO main ChukwaAgent - started a new adaptor,
id = adaptor_c79bf882974a14286cffe29d3d4cf0d6
function=[org.apache.hadoop.chukwa.datacollection.adaptor.sigar.SystemMetrics@56c163f]
2011-12-19 03:57:00,454 INFO main ChukwaAgent - started a new adaptor,
id = adaptor_93df4746476c9a4b624f6755b122f9dc
function=[org.apache.hadoop.chukwa.datacollection.adaptor.SocketAdaptor@7d95d4fe]
2011-12-19 03:57:00,455 INFO main ChukwaAgent - started a new adaptor,
id = adaptor_79203ebcc495e11b747254e660380620
function=[org.apache.hadoop.chukwa.datacollection.adaptor.SocketAdaptor@177f409c]
2011-12-19 03:57:00,456 INFO main ChukwaAgent - started a new adaptor,
id = adaptor_c6fd1e5021ad8023477ef0b56a24a29f
function=[org.apache.hadoop.chukwa.datacollection.adaptor.SocketAdaptor@2b8bbc5a]
2011-12-19 03:57:00,457 INFO main ChukwaAgent - started a new adaptor,
id = adaptor_e2b39549cac6e966126df286a79ae6ad
function=[org.apache.hadoop.chukwa.datacollection.adaptor.SocketAdaptor@513c6a22]
2011-12-19 03:57:00,460 INFO main FileAdaptor - adaptor id:
adaptor_0e36ff3fa49e813872f20a93305db668 started file adaptor on file
/home/saif/hbase
2011-12-19 03:57:00,460 INFO main ChukwaAgent - started a new adaptor,
id = adaptor_0e36ff3fa49e813872f20a93305db668
function=[org.apache.hadoop.chukwa.datacollection.adaptor.FileAdaptor@7455d93d]
2011-12-19 03:57:00,461 INFO Thread-8 FileAdaptorTailer - calling
sendFile for /home/saif/hbase
2011-12-19 03:57:00,462 INFO main AgentControlSocketListener -
AgentControlSocketListerner ask for port: 9093
2011-12-19 03:57:00,462 INFO main AgentControlSocketListener - socket
bound to 9093
2011-12-19 03:57:00,462 INFO main ChukwaAgent - control socket started
on port 9093
2011-12-19 03:57:00,470 INFO Thread-8 FileAdaptor - Adding
/home/saif/hbase to the queue
2011-12-19 03:57:00,471 INFO Thread-8 FileAdaptor - /home/saif/hbase
added to the queue
2011-12-19 03:57:00,471 INFO Thread-8 FileAdaptor - Enter
Shutdown:HARD_STOP -
ObjectId:org.apache.hadoop.chukwa.datacollection.adaptor.FileAdaptor@7455d93d
2011-12-19 03:57:00,472 INFO Thread-8 FileAdaptor - Exist
Shutdown:HARD_STOP -
ObjectId:org.apache.hadoop.chukwa.datacollection.adaptor.FileAdaptor@7455d93d
2011-12-19 03:57:00,472 INFO Thread-8 ChukwaAgent - shutdown
[Abruptly] on adaptor_0e36ff3fa49e813872f20a93305db668, FooData 0
/home/saif/hbase
2011-12-19 03:57:00,506 INFO main log - Logging to
org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via
org.mortbay.log.Slf4jLog
2011-12-19 03:57:00,547 INFO main log - jetty-6.1.26
2011-12-19 03:57SelectChannelConnector@0.0.0.0:9090
2011-12-19 03:57:00,597 INFO main ChukwaAgent - started Chukwa http
agent interface on port 9090
2011-12-19 03:57:00,597 INFO Timer-2 ChukwaAgent - writing checkpoint 0
2011-12-19 03:57:00,599 INFO main ChukwaAgent - local agent started on port 9093
2011-12-19 03:57:00,599 INFO HTTP post thread HttpConnector -
HttpConnector started at time:1324247220599
2011-12-19 03:57:00,599 INFO HTTP post thread DataFactory - Config -
System.getenv("CHUKWA_HOME"): [/home/saif/chukwa-incubating-0.5.0/]
2011-12-19 03:57:00,599 INFO HTTP post thread DataFactory - Config -
System.getenv("chukwaConf"):
[/home/saif/chukwa-incubating-0.5.0/etc/chukwa]
2011-12-19 03:57:00,599 INFO HTTP post thread DataFactory - setting up
collectors file:
/home/saif/chukwa-incubating-0.5.0/etc/chukwa/collectors
2011-12-19 03:57:00,634 INFO HTTP post thread HttpConnector - using
collectors from collectors file
2011-12-19 03:57:00,634 INFO HTTP post thread ChukwaHttpSender -
collected 1 chunks for post_0
2011-12-19 03:57:00,647 INFO HTTP post thread ChukwaHttpSender -
2011-12-19 03:57:00,700 INFO Timer-3 HttpConnector - # http chunks
ACK'ed since last report: 0
2011-12-19 03:57:00,811 INFO HTTP post thread ChukwaHttpSender -
response length 33
2011-12-19 03:57:00,812 INFO HTTP post thread ChukwaHttpSender -
post_0 sent 1 chunks, got back 1 acks
2011-12-19 03:57:00,812 WARN HTTP post thread ChukwaAgent - got commit
up to 68  for adaptor
org.apache.hadoop.chukwa.datacollection.adaptor.FileAdaptor@7455d93d
that doesn't appear to be running: 5 total
2011-12-19 03:57:05,597 INFO Timer-2 ChukwaAgent - writing checkpoint 1
2011-12-19 03:57:10,472 INFO Thread-8 FileAdaptorTailer - Waiting queue is empty
2011-12-19 03:57:14,308 INFO HTTP post thread ChukwaHttpSender -
collected 1 chunks for post_1
2011-12-19 03:57:14,308 INFO HTTP post thread ChukwaHttpSender -
2011-12-19 03:57:14,860 INFO HTTP post thread ChukwaHttpSender -
response length 35
2011-12-19 03:57:14,861 INFO HTTP po

Hi,

Do you have writer.hdfs.filesystem in chukwa-collector-conf.xml
pointing to your namenode?
>From the collector log file, it indicates that there are data written
to HBase, and HDFS.

HICC dashboard does not show any data unless you run
ClusterSummary.pig aggregation script.
You can debug if there is data in HBase by running HBase shell like this:

scan "SystemMetrics", {LIMIT=>100}

If everything is working as expected, there should be some data
appears on the console.
For data sending to HDFS, the data is normally written to:

hdfs://namenode:8020/chukwa/logs/*.done files

The data on HDFS will only get splitted apart by running chukwa demux ETL job.
After demux, the data would be stored to hdfs://namenode:8020/chukwa/repos.

Hope this helps.
regards,
Eric

On Sun, Dec 18, 2011 at 2:39 PM, Mohammad Tariq <[EMAIL PROTECTED]> wrote:
> Hello list,
>
>   I am using Chukwa-0.5.0 to collect data to HDFS and Hbase.All the
> processes seem to be running fine but I am not able to see anything
> happening on the HDFA and Hbase web interface.Need some guidance.Here
> is the content of agent.log file -
>
>  2011-12-19 03:56:59,936 INFO main Log4JMetricsContext -
> Log4JMetricsContext.chukwaAgent.period=60
> 2011-12-19 03:57:00,052 INFO main ChukwaAgent - Config - CHUKWA_HOME:
> [/home/saif/chukwa-incubating-0.5.0]
> 2011-12-19 03:57:00,052 INFO main ChukwaAgent - Config -
> CHUKWA_CONF_DIR: [/home/saif/chukwa-incubating-0.5.0/etc/chukwa]
> 2011-12-19 03:57:00,354 INFO main ChukwaAgent - Config -
> CHECKPOINT_BASE_NAME: [chukwa_agent_checkpoint]
> 2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config -
> checkpointDir: [/home/saif/chukwa/log]
> 2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config -
> CHECKPOINT_INTERVAL_MS: [5000]
> 2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config -
> DO_CHECKPOINT_RESTORE: [true]
> 2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config -
> STATS_INTERVAL_MS: [10000]
> 2011-12-19 03:57:00,355 INFO main ChukwaAgent - Config - tags:
> [cluster="chukwa"]
> 2011-12-19 03:57:00,355 INFO main ChukwaAgent - checkpoints are
> enabled, period is 5000
> 2011-12-19 03:57:00,356 INFO main ChukwaAgent - No checkpoints found
> in /home/saif/chukwa/log
> 2011-12-19 03:57:00,356 INFO main ChukwaAgent - starting adaptors
> listed in /home/saif/chukwa-incubating-0.5.0/etc/chukwa/initial_adaptors
> 2011-12-19 03:57:00,450 INFO main ChukwaAgent - started a new adaptor,
> id = adaptor_c79bf882974a14286cffe29d3d4cf0d6
> function=[org.apache.hadoop.chukwa.datacollection.adaptor.sigar.SystemMetrics@56c163f]
> 2011-12-19 03:57:00,454 INFO main ChukwaAgent - started a new adaptor,
> id = adaptor_93df4746476c9a4b624f6755b122f9dc
> function=[org.apache.hadoop.chukwa.datacollection.adaptor.SocketAdaptor@7d95d4fe]
> 2011-12-19 03:57:00,455 INFO main ChukwaAgent - started a new adaptor,
> id = adaptor_79203ebcc495e11b747254e660380620
> function=[org.apache.hadoop.chukwa.datacollection.adaptor.SocketAdaptor@177f409c]
> 2011-12-19 03:57:00,456 INFO main ChukwaAgent - started a new adaptor,
> id = adaptor_c6fd1e5021ad8023477ef0b56a24a29f
> function=[org.apache.hadoop.chukwa.datacollection.adaptor.SocketAdaptor@2b8bbc5a]
> 2011-12-19 03:57:00,457 INFO main ChukwaAgent - started a new adaptor,
> id = adaptor_e2b39549cac6e966126df286a79ae6ad
> function=[org.apache.hadoop.chukwa.datacollection.adaptor.SocketAdaptor@513c6a22]
> 2011-12-19 03:57:00,460 INFO main FileAdaptor - adaptor id:
> adaptor_0e36ff3fa49e813872f20a93305db668 started file adaptor on file
> /home/saif/hbase
> 2011-12-19 03:57:00,460 INFO main ChukwaAgent - started a new adaptor,
> id = adaptor_0e36ff3fa49e813872f20a93305db668
> function=[org.apache.hadoop.chukwa.datacollection.adaptor.FileAdaptor@7455d93d]
> 2011-12-19 03:57:00,461 INFO Thread-8 FileAdaptorTailer - calling
> sendFile for /home/saif/hbase
> 2011-12-19 03:57:00,462 INFO main AgentControlSocketListener -
> AgentControlSocketListerner ask for port: 9093
> 2011-12-19 03:57:00,462 INFO main AgentControlSocketListener - socket

Hi Eric,
   Yet  writer.hdfs.filesystem is set..But, since this property was
set I could see the following error in collector.log file -

2011-12-19 13:23:20,544 INFO main ChukwaConfiguration - chukwaConf is
/home/solr/chukwa-incubating-0.5.0/etc/chukwa
2011-12-19 13:23:20,783 INFO main log - Logging to
org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via
org.mortbay.log.Slf4jLog
2011-12-19 13:23:20,807 INFO main log - jetty-6.1.26
2011-12-19 13:23:20,829 INFO main root - initing servletCollector
2011-12-19 13:23:20,830 INFO main PipelineStageWriter - using
pipelined writers, pipe length is 3
2011-12-19 13:23:20,832 INFO Thread-6 SocketTeeWriter - listen thread started
2011-12-19 13:23:20,832 INFO main ChukwaConfiguration - chukwaConf is
/home/solr/chukwa-incubating-0.5.0/etc/chukwa
2011-12-19 13:23:20,902 INFO main ChukwaConfiguration - chukwaConf is
/home/solr/chukwa-incubating-0.5.0/etc/chukwa
2011-12-19 13:23:20,948 ERROR main PipelineStageWriter - failed to set
up pipeline, defaulting to SeqFileWriter
java.lang.ClassNotFoundException:
           org.apache.hadoop.chukwa.datacollection.writer.SeqFileWriter
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:819)
at org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter.init(PipelineStageWriter.java:80)
at org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector.init(ServletCollector.java:112)
at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:736)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:224)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.apache.hadoop.chukwa.datacollection.collector.CollectorStub.main(CollectorStub.java:136)
2011-12-19 13:23:20,950 WARN main root - Exception trying to
initialize SeqFileWriter
org.apache.hadoop.chukwa.datacollection.writer.WriterException: bad pipeline
at org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter.init(PipelineStageWriter.java:99)
at org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector.init(ServletCollector.java:112)
at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:736)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:224)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.apache.hadoop.chukwa.datacollection.collector.CollectorStub.main(CollectorStub.java:136)

Regards,
    Mohammad Tariq

On Mon, Dec 19, 2011 at 9:34 AM, Eric Yang <[EMAIL PROTECTED]> wrote:

It looks like chukwaCollector.pipeline is misconfigured.  Is there a
blank space somewhere?
Mind posting your chukwa-collector-conf.xml?

regards,
Eric

On Mon, Dec 19, 2011 at 2:13 AM, Mohammad Tariq <[EMAIL PROTECTED]> wrote:
> Hi Eric,
>   Yet  writer.hdfs.filesystem is set..But, since this property was
> set I could see the following error in collector.log file -
>
> 2011-12-19 13:23:20,544 INFO main ChukwaConfiguration - chukwaConf is
> /home/solr/chukwa-incubating-0.5.0/etc/chukwa
> 2011-12-19 13:23:20,783 INFO main log - Logging to
> org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via
> org.mortbay.log.Slf4jLog
> 2011-12-19 13:23:20,807 INFO main log - jetty-6.1.26
> 2011-12-19 13:23:20,829 INFO main root - initing servletCollector
> 2011-12-19 13:23:20,830 INFO main PipelineStageWriter - using
> pipelined writers, pipe length is 3
> 2011-12-19 13:23:20,832 INFO Thread-6 SocketTeeWriter - listen thread started
> 2011-12-19 13:23:20,832 INFO main ChukwaConfiguration - chukwaConf is
> /home/solr/chukwa-incubating-0.5.0/etc/chukwa
> 2011-12-19 13:23:20,902 INFO main ChukwaConfiguration - chukwaConf is
> /home/solr/chukwa-incubating-0.5.0/etc/chukwa
> 2011-12-19 13:23:20,948 ERROR main PipelineStageWriter - failed to set
> up pipeline, defaulting to SeqFileWriter
> java.lang.ClassNotFoundException:
>           org.apache.hadoop.chukwa.datacollection.writer.SeqFileWriter
>        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>        at java.security.AccessController.doPrivileged(Native Method)
>        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
>        at java.lang.Class.forName0(Native Method)
>        at java.lang.Class.forName(Class.java:247)
>        at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:819)
>        at org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter.init(PipelineStageWriter.java:80)
>        at org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector.init(ServletCollector.java:112)
>        at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
>        at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
>        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>        at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:736)
>        at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
>        at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
>        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>        at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
>        at org.mortbay.jetty.Server.doStart(Server.java:224)
>        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>        at org.apache.hadoop.chukwa.datacollection.collector.CollectorStub.main(CollectorStub.java:136)
> 2011-12-19 13:23:20,950 WARN main root - Exception trying to
> initialize SeqFileWriter
> org.apache.hadoop.chukwa.datacollection.writer.WriterException: bad pipeline
>        at org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter.init(PipelineStageWriter.java:99)
>        at org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector.init(ServletCollector.java:112)
>        at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
>        at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
>        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>        at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:736)
>        at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
>        at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)

Hi Eric,

   You were correct.It was because of a blank space.I am sorry for my
ignorance.Thanks again.

Regards,
    Mohammad Tariq

On Tue, Dec 20, 2011 at 10:16 AM, Eric Yang-3 [via Apache Chukwa]
<ml-node+[EMAIL PROTECTED]> wrote:
> It looks like chukwaCollector.pipeline is misconfigured.  Is there a
> blank space somewhere?
> Mind posting your chukwa-collector-conf.xml?
>
> regards,
> Eric
>
> On Mon, Dec 19, 2011 at 2:13 AM, Mohammad Tariq <[hidden email]> wrote:
>
>> Hi Eric,
>>   Yet  writer.hdfs.filesystem is set..But, since this property was
>> set I could see the following error in collector.log file -
>>
>> 2011-12-19 13:23:20,544 INFO main ChukwaConfiguration - chukwaConf is
>> /home/solr/chukwa-incubating-0.5.0/etc/chukwa
>> 2011-12-19 13:23:20,783 INFO main log - Logging to
>> org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via
>> org.mortbay.log.Slf4jLog
>> 2011-12-19 13:23:20,807 INFO main log - jetty-6.1.26
>> 2011-12-19 13:23:20,829 INFO main root - initing servletCollector
>> 2011-12-19 13:23:20,830 INFO main PipelineStageWriter - using
>> pipelined writers, pipe length is 3
>> 2011-12-19 13:23:20,832 INFO Thread-6 SocketTeeWriter - listen thread
>> started
>> 2011-12-19 13:23:20,832 INFO main ChukwaConfiguration - chukwaConf is
>> /home/solr/chukwa-incubating-0.5.0/etc/chukwa
>> 2011-12-19 13:23:20,902 INFO main ChukwaConfiguration - chukwaConf is
>> /home/solr/chukwa-incubating-0.5.0/etc/chukwa
>> 2011-12-19 13:23:20,948 ERROR main PipelineStageWriter - failed to set
>> up pipeline, defaulting to SeqFileWriter
>> java.lang.ClassNotFoundException:
>>           org.apache.hadoop.chukwa.datacollection.writer.SeqFileWriter
>>        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>>        at java.security.AccessController.doPrivileged(Native Method)
>>        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>>        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>>        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>>        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
>>        at java.lang.Class.forName0(Native Method)
>>        at java.lang.Class.forName(Class.java:247)
>>        at
>> org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:819)
>>        at
>> org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter.init(PipelineStageWriter.java:80)
>>        at
>> org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector.init(ServletCollector.java:112)
>>        at
>> org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
>>        at
>> org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
>>        at
>> org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>>        at
>> org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:736)
>>        at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
>>        at
>> org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
>>        at
>> org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>>        at
>> org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
>>        at org.mortbay.jetty.Server.doStart(Server.java:224)
>>        at
>> org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>>        at
>> org.apache.hadoop.chukwa.datacollection.collector.CollectorStub.main(CollectorStub.java:136)
>> 2011-12-19 13:23:20,950 WARN main root - Exception trying to
>> initialize SeqFileWriter
>> org.apache.hadoop.chukwa.datacollection.writer.WriterException: bad
>> pipeline
>>        at
>> org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter.init(PipelineStageWriter.java:99)
>>        at
>> org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector.init(ServletCollector.java:112)
>>        at
>> org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
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