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Fix entry count metric for lookup caches #4558

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merged 1 commit into from Feb 2, 2018

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joschi commented Feb 2, 2018

  • Fix entry count metric for lookup caches

The way the LookupCache#entryCount() method was defined, caused implementers to write incorrect implementations.

For example GuavaLookupCache#entryCount() returned a constant Gauge<Long> on the first call (in the constructor
of LookupCache) which was never updated.

Additionally, the CacheTableEntry tried to access the entry count metric through an invalid object path which
resulted in the metric always being displayed as "NaN" in the web interface.

Fixes #4540

  • Make entry count Gauge compatible with Graylog 2.4.x

Refs #4499

Refs #4541
(cherry picked from commit 0ddbeac)

Fix entry count metric for lookup caches
* Fix entry count metric for lookup caches

The way the `LookupCache#entryCount()` method was defined, caused implementers to write incorrect implementations.

For example `GuavaLookupCache#entryCount()` returned a constant `Gauge<Long>` on the first call (in the constructor
of `LookupCache`) which was never updated.

Additionally, the `CacheTableEntry` tried to access the entry count metric through an invalid object path which
resulted in the metric always being displayed as "NaN" in the web interface.

Fixes #4540

* Make entry count Gauge compatible with Graylog 2.4.x

Refs #4499

Refs #4541
(cherry picked from commit 0ddbeac)

@joschi joschi added this to the 2.4.4 milestone Feb 2, 2018

@bernd bernd self-assigned this Feb 2, 2018

@bernd

bernd approved these changes Feb 2, 2018

@bernd bernd merged commit 1f4bcbd into 2.4 Feb 2, 2018

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@bernd bernd deleted the issue-4540-2.4 branch Feb 2, 2018

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