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https://issues.apache.org/jira/browse/HBASE-21301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16670356#comment-16670356
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Archana Katiyar commented on HBASE-21301:
-----------------------------------------
Need help. When I am testing changes for this Jira using 'hbase master start',
I am seeing following error -
_2018-10-31 21:58:46,444 WARN [master/10.0.0.8:16000:becomeActiveMaster]
master.HMaster:
hbase:namespace,,1540714799202.4877e41f08ffe48fa36526c157d11c40. is NOT online;
state=\{4877e41f08ffe48fa36526c157d11c40 state=OPEN, ts=1541003319363,
server=10.0.0.8,16020,1540714789505}; ServerCrashProcedures=true. Master
startup cannot progress, in holding-pattern until region onlined._
Any idea what is missing here? I am working on master branch.
> 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
> Fix For: 3.0.0, 1.5.0, 2.2.0
>
> Attachments: HBASE-21301.v1.patch
>
>
> 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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