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https://issues.apache.org/jira/browse/HBASE-21301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16653913#comment-16653913
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Andrew Purtell commented on HBASE-21301:
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bq. <table_name_uid - 1 byte><timestamp - 4 bytes><metric_name_uid 1
byte><region_uid 1 byte><region_name_uid - x bytes>
We will need more than 1 byte for table_name_uid and region_name_uid. Assume
for design purposes the number of regions or tables can be on the order of
millions. I think that calls for 4 bytes, maybe 3 for table_name_uid (unsigned
24 bits allows for 16777215 unique values). This will still be a lot more
efficient than putting the table name and region name as strings into the key.
What is region_uid? Isn't the region uniquely identified by region_name_uid?
> Heatmap for key access patterns
> -------------------------------
>
> Key: HBASE-21301
> URL: https://issues.apache.org/jira/browse/HBASE-21301
> Project: HBase
> Issue Type: Improvement
> Reporter: Archana Katiyar
> Assignee: Archana Katiyar
> Priority: Major
>
> Google recently released a beta feature for Cloud Bigtable which presents a
> heat map of the keyspace. *Given how hotspotting comes up now and again here,
> this is a good idea for giving HBase ops a tool to be proactive about it.*
> >>>
> Additionally, we are announcing the beta version of Key Visualizer, a
> visualization tool for Cloud Bigtable key access patterns. Key Visualizer
> helps debug performance issues due to unbalanced access patterns across the
> key space, or single rows that are too large or receiving too much read or
> write activity. With Key Visualizer, you get a heat map visualization of
> access patterns over time, along with the ability to zoom into specific key
> or time ranges, or select a specific row to find the full row key ID that's
> responsible for a hotspot. Key Visualizer is automatically enabled for Cloud
> Bigtable clusters with sufficient data or activity, and does not affect Cloud
> Bigtable cluster performance.
> <<<
> From
> [https://cloudplatform.googleblog.com/2018/07/on-gcp-your-database-your-way.html]
> (Copied this description from the write-up by [~apurtell], thanks Andrew.)
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