[jira] [Created] (AURORA-178) Log/observe snapshot operations

["Jonathan Boulle (JIRA)" <ji...@apache.org>]

Jonathan Boulle created AURORA-178:
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             Summary: Log/observe snapshot operations
                 Key: AURORA-178
                 URL: https://issues.apache.org/jira/browse/AURORA-178
             Project: Aurora
          Issue Type: Task
          Components: Scheduler
            Reporter: Jonathan Boulle
            Priority: Minor


Currently, snapshot operations of excessive duration aren't necessarily obvious in e.g. the scheduler logs or dashboards. Since this is a potentially critical/dangerous operation (in some cases leading to zookeeper timeouts + scheduler suicide), it would be prudent to expose relevant information more readily (e.g. when the operations commence/complete, timing, etc)

>From Zameer:
{quote}The doSnapshot method of LogStorage is timed with the key "scheduler_log_snapshot". These are the stats it produces:

scheduler_log_snapshot_events 19
scheduler_log_snapshot_events_per_sec 0.0
scheduler_log_snapshot_nanos_per_event 0.0
scheduler_log_snapshot_nanos_total 373115257383
scheduler_log_snapshot_nanos_total_per_sec 0.0
scheduler_log_snapshot_persist_events 19
scheduler_log_snapshot_persist_events_per_sec 0.0
scheduler_log_snapshot_persist_nanos_per_event 0.0
scheduler_log_snapshot_persist_nanos_total 339151517713
scheduler_log_snapshot_persist_nanos_total_per_sec 0.0
scheduler_log_snapshots 19

Which metric should be tracked in our dashboard?
{quote}

>From Bill F:
{quote}a very long snapshot might never be reflected there if a suicide happens mid-way through. The minimal fix would be to just LOG when a snapshot is about to commence.{quote}



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