tree 2168bb50d017d60e16bde835a8c0d136fb9813ac
parent 0c6b6b66a9b8ae6626d2c500e1afbed0ef06e7a7
author Vishwajith Shivappa <vishwajith.s@gmail.com> 1597855554 -0700
committer GitHub <noreply@github.com> 1597855554 -0700
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SAMZA-2583: Fix NPE in update SamzaHistogram Gauge values (#1418)

* SAMZA-2583: Fix NPE in update SamzaHistogram Gauge values

SamzaHistogram gauges are instantiated via passed in metric registry
newGauge api. The new Gauge api in turn tries to instantiate
HistogramGauge. The newGauge api calls getValue on HistogramGauge
which in turn tries to update the Histogram Gauge values. This means
we are updating Histogram Gauge values in process of creating it.
As a fix, we add  null check in Gauge getValue to avoid NPE.