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https://issues.apache.org/jira/browse/OAK-3654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15024219#comment-15024219
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Ian Boston commented on OAK-3654:
---------------------------------
The metrics stats show 2 things.
{code}
min=0.0, max=0.0, mean=0.0, stddev=0.0, median=0.0
duration_unit=microseconds
{code}
The section being timed is too small for System.nanoTime() to detect a
duration. (conclusive)
{code}
mean_rate=2268390.1680024294
{code}
The block gets called at least every 4.4e-7s assuming no other operations.
(indicative, as there are other operations)
Both of which are a strong indication that the block is too quick to be timed
with a timer of the resolution available in the JDK, even if the timing
mechanism had no overhead.
Adding some other sort of instrumentation (meter, counter) might provide
something of value when monitoring the rates longitudinally, but based on the
above it's probable the block should not be instrumented at all.
> Integrate with Metrics for various stats collection
> ----------------------------------------------------
>
> Key: OAK-3654
> URL: https://issues.apache.org/jira/browse/OAK-3654
> Project: Jackrabbit Oak
> Issue Type: New Feature
> Components: core
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
> Fix For: 1.3.12
>
> Attachments: OAK-3654-v1.patch, query-stats.png
>
>
> As suggested by [~ianeboston] in OAK-3478 current approach of collecting
> TimeSeries data is not easily consumable by other monitoring systems. Also
> just extracting the last moment data and exposing it in simple form would not
> be useful.
> Instead of that we should look into using Metrics library [1] for collecting
> metrics. To avoid having dependency on Metrics API all over in Oak we can
> come up with minimal interfaces which can be used in Oak and then provide an
> implementation backed by Metric.
> This task is meant to explore that aspect and come up with proposed changes
> to see if its feasible to make this change
> * metrics-core ~100KB in size with no dependency
> * ASL Licensee
> [1] http://metrics.dropwizard.io
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