Agents and Collectors do not respond to HUP signals
---------------------------------------------------
Key: CHUKWA-631
URL: https://issues.apache.org/jira/browse/CHUKWA-631
Project: Chukwa
Issue Type: Bug
Components: data collection
Affects Versions: 0.4.0
Environment: Red Hat Enterprise Linux Server release 5.4, 64 bit
{noformat}
$ java -version
java version "1.6.0_23"
Java(TM) SE Runtime Environment (build 1.6.0_23-b05)
Java HotSpot(TM) 64-Bit Server VM (build 19.0-b09, mixed mode)
{noformat}
Reporter: Noel Duffy
On RHEL 5.4, agents and collectors do not respond to HUP signals sent to the
process PID.
I start the agent like this, then attempt to kill it like so:
{noformat}
$ pwd
/usr/local/chukwa/bin
$ ./start-agents.sh
$ pgrep -lf Agent
23148 /usr/java/latest/bin/java
-Djava.library.path=/usr/lib/hadoop/lib/native/Linux-X86-64 [...]
org.apache.hadoop.chukwa.datacollection.agent.ChukwaAgent
$ cat /var/run/Agent.pid
23148
$ kill -hup 23148
$ ps -fp 23148
UID PID PPID C STIME TTY TIME CMD
root 23148 1 0 Jan23 pts/0 00:00:19 /usr/java/latest/bin/java
-Djava.library.path=/usr/lib/hadoop/lib/native/}}
$ pgrep -lf Agent
23148 /usr/java/latest/bin/java
-Djava.library.path=/usr/lib/hadoop/lib/native/Linux-X86-64 [...] :
org.apache.hadoop.chukwa.datacollection.agent.ChukwaAgent}}
{noformat}
The agent is still running, and /var/log/agent.log shows no indication that the
signal was seen.
The agent is running one adaptor:
{noformat}
$ echo "list" | nc localhost 9093
adaptor_b5382452cfdc2ae81bd45d8126804843)
org.apache.hadoop.chukwa.datacollection.adaptor.ExecAdaptor Iostat 60
/usr/bin/iostat -x -k 55 2 11215696
{noformat}
We can see this child process running too:
{noformat}
$ ps -f --ppid 23148
UID PID PPID C STIME TTY TIME CMD
root 7116 23148 0 12:40 pts/0 00:00:00 /usr/bin/iostat -x -k 55 2
{noformat}
In the case of the collector, I start it like so:
{noformat}
$ ./start-collectors.sh
localhost: starting collector, logging to
/var/log/chukwa-chukwa-collector-<hostname.>out
localhost: 2012-01-24 04:24:11.04::INFO: Logging to STDERR via
org.mortbay.log.StdErrLog
localhost: 2012-01-24 04:24:11.104::INFO: jetty-6.1.11
$ pgrep -lf collector
10220 /usr/java/latest/bin/java
-Djava.library.path=/usr/lib/hadoop/lib/native/Linux-X86-64
-DCHUKWA_HOME=/usr/local/chukwa/bin/.. [...] :
org.apache.hadoop.chukwa.datacollection.collector.CollectorStub
$ kill -HUP 10220
$ pgrep -lf collector
10220 /usr/java/latest/bin/java
-Djava.library.path=/usr/lib/hadoop/lib/native/Linux-X86-64
-DCHUKWA_HOME=/usr/local/chukwa/bin/ [...]:
org.apache.hadoop.chukwa.datacollection.collector.CollectorStub
{noformat}
The logs on the collector show no indication that any signal was received.
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