[
https://issues.apache.org/jira/browse/HBASE-20883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16545229#comment-16545229
]
Hari Sekhon commented on HBASE-20883:
-------------------------------------
{quote}This won't scale
{quote}
HMaster UI already shows Total Requests Per Sec next to each RegionServer,
which I think is already calculated from readRequestCount + writeRequestCount
or totalRequestCount differentials. It's just two more columns to expose that
information in the existing table.
I already have OpenTSDB but it's handy for some tools and scripts to be able to
get this information from HBase directly, perhaps you don't want to have to set
up OpenTSDB on HBase to be able to debug somebody's HBase installation and
since it appears that HMaster is already collecting and averaging the
information, it doesn't seem like it hurts to expose that same information in
JMX.
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
