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From Gerrit Jansen van Vuuren <gvanvuu...@specificmedia.com>
Subject RE: Problem in ChukwaRecord file contents
Date Tue, 08 Jun 2010 13:55:46 GMT
Have a look at:

 

 

org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.LWFTAdaptor

 

protected int extractRecords(ChunkReceiver eq, long buffOffsetInFile,

      byte[] buf) throws InterruptedException {

 

 

org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.CharFileTailingAd
aptorUTF8

protected int extractRecords(ChunkReceiver eq, long buffOffsetInFile,

      byte[] buf) throws InterruptedException {

 

If you need one line per record you'd have to write your own adaptor. Maybe
subclass CharFileTailingAdaptorUTF8 

 

 

 

From: Stuti Awasthi [mailto:Stuti_Awasthi@persistent.co.in] 
Sent: Tuesday, June 08, 2010 1:31 PM
To: chukwa-user@hadoop.apache.org; Gerrit van Vuuren
Subject: RE: Problem in ChukwaRecord file contents

 

So is  that means that we will always have several lines of log data in the
<body> tag of chukwa record?

 Can you please tell me where is that agent code that defines this.

 

I have read these ChukwaRecord through Map Reduce and can read the original
log lines. J

 

Stuti

 

From: Gerrit Jansen van Vuuren [mailto:gvanvuuren@specificmedia.com] 
Sent: Tuesday, June 08, 2010 5:53 PM
To: chukwa-user@hadoop.apache.org
Subject: RE: Problem in ChukwaRecord file contents

 

Each chukwa record will contain several lines of log data (depending on how
the agent defines lines J ).

 

You can use the MapReduce Jobs, HDFS or Pig to read these files.  You might
need to do some coding though.

 

I use pig to read to chukwa files and then to get the original log lines I
output the data column (i.e. these original records) using a pig BinStorage.

 

Have a look at
com.specificmedia.hadoop.logimport.demux.chukwa.ChukwaArchive() and the
other chukwa-core classes.

 

Hope this helps.

 

 

Cheers,

 

 

 

From: Stuti Awasthi [mailto:Stuti_Awasthi@persistent.co.in] 
Sent: Tuesday, June 08, 2010 12:51 PM
To: chukwa-user@hadoop.apache.org
Subject: Problem in ChukwaRecord file contents

 

Hi All,

 

I gave my log file as input to chukwa and converted it to .evt file i.e.
ChukwaRecord file

I checked the ChukwaRecord file which is a sequence file with
ChukwaRecordKey and ChukwaRecord.

I saw that the ChukwaRecord contains Timestamp and some other fields. One of
them is the "body" field. 

However, this body field of each record contains a bunch of lines (from my
original log file). 

 

Contents of Original log file:

 

May 29 13:00:16 ps3156 syslogd 1.5.0#5ubuntu3: restart.

May 29 13:00:16 ps3156 anacron[4148]: Job `cron.daily' terminated

May 29 13:00:16 ps3156 anacron[4148]: Normal exit (1 job run)

May 29 13:09:02 ps3156 /USR/SBIN/CRON[19815]: (root) CMD (  [ -x
/usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/
-type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm)

May 29 13:09:02 ps3156 /USR/SBIN/CRON[19815]: (root) CMD (  [ -x
/usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/
-type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm)

 

 

Contents of ChukwaRecord file:

 

{"DataType": "SysLog", "Key":
"1275118200000/ps3156.persistent.co.in/1275118216000", "Timestamp":
1275118216000, "mapFields": {"csource": "ps3156.persistent.co.in", "capp":
"/home/hadoop/Test/syslog_test", "ctags": " cluster="chukwa"", "body": "May
29 13:00:16 ps3156 syslogd 1.5.0#5ubuntu3: restart.

May 29 13:00:16 ps3156 anacron[4148]: Job `cron.daily' terminated

May 29 13:00:16 ps3156 anacron[4148]: Normal exit (1 job run)

May 29 13:09:02 ps3156 /USR/SBIN/CRON[19815]: (root) CMD (  [ -x
/usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/
-type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm)

May 29 13:09:02 ps3156 /USR/SBIN/CRON[19815]: (root) CMD (  [ -x
/usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/
-type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm)
} }

 

I can see that each record in the ChukwaRecord file contains a chunk of
lines from the original log file. Is this behavior correct? 

According to my understanding, each record in the ChukwaRecord file should
contain only one line from the original log file. 

Is it possible to create such a ChukwaRecord file?

Please suggest. 

 

 

Stuti

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