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Posted to issues@hbase.apache.org by "Guangxu Cheng (JIRA)" <ji...@apache.org> on 2018/07/13 11:25:00 UTC
[jira] [Commented] (HBASE-20883) HMaster Read / Write Requests Per
Sec across RegionServers, currently only Total Requests Per Sec
[ https://issues.apache.org/jira/browse/HBASE-20883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16542919#comment-16542919 ]
Guangxu Cheng commented on HBASE-20883:
---------------------------------------
Duplicate of HBASE-20626?
> HMaster Read / Write Requests Per Sec across RegionServers, currently only Total Requests Per Sec
> --------------------------------------------------------------------------------------------------
>
> Key: HBASE-20883
> URL: https://issues.apache.org/jira/browse/HBASE-20883
> Project: HBase
> Issue Type: Improvement
> Components: Admin, master, metrics, monitoring, UI, Usability
> Affects Versions: 1.1.2
> Reporter: Hari Sekhon
> Priority: Major
>
> HMaster currently shows Requests Per Second per RegionServer under HMaster UI's /master-status page -> Region Servers -> Base Stats section in the Web UI.
> Please add Reads Per Second and Writes Per Second per RegionServer alongside this in the HMaster UI, and also expose the Read/Write/Total requests per sec information in the HMaster JMX API.
> This will make it easier to find read or write hotspotting on HBase as a combined total will minimize and mask differences between RegionServers. For example, we do 30,000 reads/sec but only 900 writes/sec to each RegionServer, so write skew will be masked as it won't show enough significant difference in the much larger combined Total Requests Per Second stat.
> For now I've written a Python tool to calculate this info from RegionServers JMX read/write/total request counts but since HMaster is collecting this info anyway it shouldn't be a big change to improve it to also show Reads / Writes Per Sec as well as Total.
> Find my tools for more granular Read/Write Requests Per Sec Per Regionserver and also Per Region at my [PyTools github repo|https://github.com/harisekhon/pytools] along with a selection of other HBase tools I've used for performance debugging over the years.
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