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Chukwa >> mail # user >> Deadlock happening in ChukwaDailyRollingFileAppender


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Re: Deadlock happening in ChukwaDailyRollingFileAppender
Hi Abhijit,

SocketAppender sends log entries as a full entry.  Chunk is created
per log entry (can be multiple lines).  There is no need to do
additional escaping.  SocketAdaptor should be configured in
initial_adaptors like:

add SocketAdaptor JobSummary 9098 0

This means to tag the log file collected through port 9098 as
JobSummary log file.
Hope this helps.

regards,
Eric

On Sun, Jun 24, 2012 at 6:27 PM, Abhijit Dhar <[EMAIL PROTECTED]> wrote:
> Does SocketAppender ecsape newlines? Like, log an exception with a stack
> trace(multiple lines) as a single log statement? And can it register an
> adapter automatically?
>
> On Jun 24, 2012 12:20 PM, "Eric Yang" <[EMAIL PROTECTED]> wrote:
>>
>> Hi Abhijit,
>>
>> The dead lock happens when there are too many registrations with the
>> agent and agent has exceeded the open file descriptor limit.  I would
>> recommend to use Log4J SocketAppender with combination of
>> SocketAdaptor.  It reduces the overhead of file offset tracking and
>> reduces the number of file descriptors used by the agent.  It works
>> better than using ChukwaDailyFileAppender and file adaptor
>> combination.
>>
>> regards,
>> Eric
>>
>> On Fri, Jun 22, 2012 at 9:50 AM, Abhijit Dhar <[EMAIL PROTECTED]>
>> wrote:
>> > Hi,
>> >
>> > I am getting a deadlock in ChukwaDailyRollingFileAppender. The thread
>> > dump
>> > is:
>> >
>> > Found one Java-level deadlock:
>> > ============================>> > "Thread-4":
>> >  waiting to lock monitor 0x00007f1970004818 (object 0x00000000cb6669e8,
>> > a
>> > java.lang.Class),
>> >  which is held by "Thread for syncLogs"
>> > "Thread for syncLogs":
>> >  waiting to lock monitor 0x00007f1970004ea8 (object 0x00000000d65c44b8,
>> > a
>> > org.apache.log4j.Logger),
>> >  which is held by "main"
>> > "main":
>> >  waiting to lock monitor 0x00007f1970003d98 (object 0x00000000d65c3e80,
>> > a
>> > org.apache.log4j.Logger),
>> >  which is held by "communication thread"
>> > "communication thread":
>> >  waiting to lock monitor 0x0000000041eba250 (object 0x00000000d6736ec0,
>> > a
>> > java.lang.Object),
>> >  which is held by "main"
>> >
>> > Java stack information for the threads listed above:
>> > ==================================================>> > "Thread-4":
>> >        at org.apache.hadoop.mapred.TaskLog.syncLogs(TaskLog.java:213)
>> >        - waiting to lock <0x00000000cb6669e8> (a java.lang.Class for
>> > org.apache.hadoop.mapred.TaskLog)
>> >        at org.apache.hadoop.mapred.Child$1.run(Child.java:75)
>> > "Thread for syncLogs":
>> >        at org.apache.log4j.Category.getAllAppenders(Category.java:409)
>> >        - waiting to lock <0x00000000d65c44b8> (a
>> > org.apache.log4j.Logger)
>> >        at org.apache.hadoop.mapred.TaskLog.syncLogs(TaskLog.java:218)
>> >        - locked <0x00000000cb6669e8> (a java.lang.Class for
>> > org.apache.hadoop.mapred.TaskLog)
>> >        at org.apache.hadoop.mapred.Child$2.run(Child.java:89)
>> > "main":
>> >        at org.apache.log4j.Category.callAppenders(Category.java:202)
>> >        - waiting to lock <0x00000000d65c3e80> (a
>> > org.apache.log4j.Logger)
>> >        at org.apache.log4j.Category.forcedLog(Category.java:388)
>> >        at org.apache.log4j.Category.warn(Category.java:1008)
>> >        at
>> >
>> > org.apache.hadoop.chukwa.datacollection.controller.ChukwaAgentController.addByName(ChukwaAgentController.java:267)
>> >        at
>> >
>> > org.apache.hadoop.chukwa.inputtools.log4j.ChukwaDailyRollingFileAppender.subAppend(ChukwaDailyRollingFileAppender.java:565)
>> >        - locked <0x00000000d6736ec0> (a java.lang.Object)
>> >        at
>> > org.apache.log4j.WriterAppender.append(WriterAppender.java:159)
>> >        at
>> > org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:230)
>> >        - locked <0x00000000d65b38c0> (a
>> > com.glassdoor.chukwa.inputtools.log4j.GDChukwaDailyRollingFileAppender)
>> >        at
>> >
>> > org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:65)