Elek, Marton created HDDS-240:
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Summary: Implement metrics for EventQueue
Key: HDDS-240
URL: https://issues.apache.org/jira/browse/HDDS-240
Project: Hadoop Distributed Data Store
Issue Type: Bug
Components: SCM
Reporter: Elek, Marton
Assignee: Elek, Marton
Fix For: 0.2.1
The heart of the SCM is the lightweight EventQueue which is implemented in
HDDS-25.
The main advantage to use a centralized EventQueue API is that all the thread
handling could be implemented in one central place (with unified the
monitoring, thread naming, lifecycle management).
In this jira I propose to create basic metrics for EventQueue. As (in the
current implementation) each handler has an own executor which has already some
metrics (for check when the unit tests could be stoped), it's quite easy to
convert the atomic counters to real hadoop metrics.
For the sake of simplicity I also propose to remove the addHandlerGroup. The
method supported the case when the Executor was shared between multiple
handlers. It's a special case, it's more harder to monitor (we need tricky
naming convention) and can't see real demand. We can restore it when we will
see the requirements.
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