What exactly does mean CoordinatorScanLatency for example
CoordinatorScanLatency is a timer metric that present coordinator range scan
latency for table.
Is it latency on full table scan or maybe range scan by clustering key?
It is range scan.. clustering key is used to only store data in
sorted fashion – partition key along with chosen partitioner helps in range
scan of data.
Can anybody write into partition while locked?
Writes are atomic – it depends on your chosen consistency level
to determine if writes will fail or succeed.
From: Павел Сапежко [mailto:amelius0...@gmail.com]
Sent: Friday, July 07, 2017 8:23 AM
To: user@cassandra.apache.org
Subject: Re: Understanding of cassandra metrics
Are you really think that I don't read docs? Do you have enough information in
the documentation? I think no. What exactly does mean CoordinatorScanLatency
for example? Is it latency on full table scan or maybe range scan by clustering
key? What exactly mean ViewLockAcquireTime? What is "partition lock"? Can
anybody write into partition while locked? Etc.
пт, 7 июл. 2017 г. в 13:01, Ivan Iliev
<ivan.iliev.il...@gmail.com<mailto:ivan.iliev.il...@gmail.com>>:
1st result on google returns:
http://cassandra.apache.org/doc/latest/operating/metrics.html<https://urldefense.proofpoint.com/v2/url?u=http-3A__cassandra.apache.org_doc_latest_operating_metrics.html&d=DwMFaQ&c=LFYZ-o9_HUMeMTSQicvjIg&r=FsmDztdsVuIKml8IDhdHdg&m=xLXSLhev337PLD18_DQUB610StqO2URoRumDH-UXdtk&s=xTDUr1_OtTvWNi15F4GNSYs6lzQHi-2wX7oa2T37RCY&e=>
On Fri, Jul 7, 2017 at 12:16 PM, Павел Сапежко
<amelius0...@gmail.com<mailto:amelius0...@gmail.com>> wrote:
Hello, I have several question about cassandra metrics. What does exactly mean
the next metrics:
* CoordinatorReadLatency
* CoordinatorScanLatency
* ReadLatency
* RangeLatency
* ViewLockAcquireTime
* ViewReadTime
--
С уважением,
Павел Сапежко
skype: p.sapezhko
--
С уважением,
Павел Сапежко
skype: p.sapezhko
