Checkpoints increasing without sending data to collector
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Key: CHUKWA-580
URL: https://issues.apache.org/jira/browse/CHUKWA-580
Project: Chukwa
Issue Type: Bug
Affects Versions: 0.4.0
Environment: RHEL
Reporter: Stuti Awasthi
I have a query regarding the checkpoints in chukwa. According to theory :
Every few minutes, each agent process polls a collector to find the length of
each file to which data is being written. The length of the file is then
compared with the offset at which each chunk was to be written. If the file
length exceeds this value, then the data has been committed and the agent
process advances its checkpoint accordingly.(Note that the length returned by
the filesystem is the amount of data that has been successfully replicated.)
This means that chukwa_agent_checkpoint would increase only when the agent
receivers and ack from the collectors. But in case of dirtailing adapter, this
is not correct. I have done the following steps to test this :
- Started agent with some dummy collector which was not present.
- Added dirtailing adapter with Charfile tailing adapter
I can see the following output in my checkpoint file :
ADD adaptor_67653208e8dea46c798e46753fc19dad =
org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.CharFileTailingAdaptorUTF8
Stuti 0 /root/Stuti/yum.log 0
ADD adaptor_b505db62647203ffa3cfe17374042870 =
org.apache.hadoop.chukwa.datacollection.adaptor.DirTailingAdaptor Stuti
/root/Stuti filetailer.CharFileTailingAdaptorUTF8 1295014173306
Since data is not getting sent to collector, so checkpoints should not increase.
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