division of responsibility between agent and adaptor
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Key: CHUKWA-284
URL: https://issues.apache.org/jira/browse/CHUKWA-284
Project: Hadoop Chukwa
Issue Type: Bug
Components: data collection
Affects Versions: 0.1.2, 0.2.0
Reporter: Ari Rabkin
Fix For: 0.2.0
The division of responsibility between adaptor and agent for managing offsets,
datatypes, and such has gotten quite squirrely. And the comments don't match
the code.
For instance, the adaptors track last offset. This means that checkpoint files
include the last byte enqueued to be SENT, rather than the last byte
ACKNOWLEDGED. This violates both the spec and the comments.
I propose that we make the agent responsible for recording offsets and possibly
also datatypes. Are there cases where an Adaptor decides on its own what the
Datatype is for the chunks it outputs? Or outputs chunks of different Types?
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