Chi-Hsuan Huang created HDDS-17693:
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Summary: [Recon][UI] Heatmap hides keys with very low read counts
Key: HDDS-17693
URL: https://issues.apache.org/jira/browse/HDDS-17693
Project: Apache Ozone
Issue Type: Bug
Reporter: Chi-Hsuan Huang
The heatmap API omits {{color}} when it is 0.0, because
{{EntityReadAccessHeatMapResponse}} uses {{@JsonInclude\(NON\_DEFAULT\)}} on a
primitive {{double}}. {{HeatMapUtil}} floors the color to 3 decimals, so a key
read less than 0.1% as often as the busiest key in its bucket arrives without
{{color}}, for example:
{code}
{"label":"cold\-key","path":"/vol1/buck1/cold\-key","size":256,"accessCount":1}
{code}
The UI uses {{color}} to detect leaves. {{updateSize}} in {{heatmap.tsx}} only
sets {{normalizedSize}} when the node has {{color}}, so this key gets no size
and is not drawn at all. Giving the same key {{"color": 0.002}} makes it render
normally.
{{nodeClick}} in {{heatmapPlot.tsx}} has the same check \({{\!data.color}}\),
so once the tile is visible again, clicking it would drill into the key path.
Both checks should tell leaves from groups by structure instead: groups always
have a non\-empty {{children}}, and leaves omit it \({{NON\_EMPTY}}\).
Reproduced with HeatMapUtil.generateHeatMap on two keys in one bucket \(5000
reads and 1 read\), and by loading that JSON into the Recon UI dev server. Not
yet tried on a live cluster.
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