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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: Nodetool status load value
Date Wed, 29 May 2019 16:12:35 GMT
Hello Simon,

Sorry if the question has already been answered.


This was probably answered here indeed (and multiple times I'm sure), but I
do not mind taking a moment to repeat this :).

About *why?*

This difference is expected. It can be due to multiple factors such as:
- Different compaction states on distinct nodes
- Ongoing compaction and temporary SSTables
- Different number of tombstones evicted (somewhat related to the first
point)
- imbalances in schema/workload (not applicable here, all nodes have 100%
of the data)
- A low number of vnodes (that is good for many other reasons) does have a
negative impact on distribution. (Not applicable, with 256 nodes, data
should be almost perfectly distributed)
- Any snapshots?
- ... (others that don't come to mind right now...)

Anyway, to answer your question more precisely:

Is it OK to have differences between nodes ?


Yes, with this proportions it is perfectly ok. Nodes have a similar dataset
and I imagine queries are well distributed. The situation seems to be
normal, at least nothing looking wrong in this `nodetool status` output I
would say.

C*heers,
-----------------------
Alain Rodriguez - alain@thelastpickle.com
France / Spain

The Last Pickle - Apache Cassandra Consulting
http://www.thelastpickle.com



Le mer. 29 mai 2019 à 08:09, Simon ELBAZ <selbaz@linagora.com> a écrit :

> Hi,
>
> Sorry if the question has already been answered.
>
> Where nodetool status is run on a 3 node cluster (replication factor : 3),
> the load between the different nodes is not equal.
>
> *# nodetool status opush*
> *Datacenter: datacenter1*
> *=======================*
> *Status=Up/Down*
> *|/ State=Normal/Leaving/Joining/Moving*
> *--  Address       Load       Tokens  Owns (effective)  Host
> ID                               Rack*
> *UN  192.168.11.3  9,14 GB    256     100,0%
> 989589e8-9fcf-4c2f-85e9-c0599ac872e5  rack1*
> *UN  192.168.11.2  8,54 GB    256     100,0%
> 42223dd0-1adf-433c-810d-8bc87f0d3af4  rack1*
> *UN  192.168.11.4  8,92 GB    256     100,0%
> 1cecacc3-c301-4ae9-a71e-1a1a944d5731  rack1*
>
> Is it OK to have differences between nodes ?
>
> Thanks for your answer.
>
> Simon
>
>

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