Executor resource monitoring and local reporting of usage stats
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Key: MESOS-38
URL: https://issues.apache.org/jira/browse/MESOS-38
Project: Mesos
Issue Type: Improvement
Environment: Initial executor monitoring for linux only. Dummy
monitoring capability (no-op) for OSX, with functionality to be filled in later.
Reporter: Sam Whitlock
Implement reporting of resource usage usage on executors and log them to a
local log file (for now). The eventual usage of this will be to report these
statistics to the Mesos master in order to build either or both a timeline for
the webui and/or a top-like command-line interface. This improvement ticket is
just for the local monitoring and log file reporting. A reporting system (to
the master node) will be a later improvement ticket.
With the current version of Mesos, it is not possible to monitor individual
task. Therefore the best this sort of system can do is monitor the usage of an
individual executor and aggregate the resource usage of over the executor's
tasks and resource allocations.
Reporting will be available for both lxc isolation and process-based isolation.
For lxc isolation the task is easier because of the isolation facilities of
lxc. Process-based isolation is more difficult as processes can become
re-parented from the process tree of the executor (e.g. double fork). The
session ID and the process group ID will likely still be the same as that of
the executor except for the uncommon case of the process resetting both of
those.
Initial reporting will be to a local log file. This will be a 'heartbeat' style
akin to pidstat output (in sysstat library). This may not be incredibly useful,
but local monitoring of resource usage is separate from the reporting and
timeline building mentioned above.
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