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From Andres de la Peña (Jira) <>
Subject [jira] [Commented] (CASSANDRA-16104) Wrong warning about data volumes capacity
Date Thu, 15 Jul 2021 12:55:00 GMT


Andres de la Peña commented on CASSANDRA-16104:

I think that we can change the value of {{concurrent_compactors}} without the setters, we
can just edit it in the configuration file of each tested node. The idea for the test would
be verifying that nodetool is able to throw the warning depending on the configuration of
the connected node, independently of the local environment. I gave it a try with [this tiny
Python dtest|]. The test passes with the
patch and fails without it.

Here is a new CI round including 100 rounds of the proposed dtest:

> Wrong warning about data volumes capacity
> -----------------------------------------
>                 Key: CASSANDRA-16104
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tool/nodetool
>            Reporter: Dmitrii Saprykin
>            Assignee: Dmitrii Saprykin
>            Priority: Normal
>          Time Spent: 10m
>  Remaining Estimate: 0h
> I see the following warning trying to run *nodetool upgradesstables*
> {noformat}
> WARN  16:09:24 Only 34988 MB free across all data volumes. Consider adding more capacity
to your cluster or removing obsolete snapshots
> {noformat}
> This warning is wrong because the wrong storage device capacity gets tested.
> All my cassandra data paths are subdirectories of */data* mount point which has enough
of space:
> {noformat}
> $ df -h /data
> Filesystem      Size  Used Avail Mounted on
> .................     1.2T 200G  1T  /data
> {noformat}
> However what Warning reports is a OS mount which has nothing to do with Cassandra configuration:
> {noformat}
> df -h /
> Filesystem      Size  Used Avail Use% Mounted on
> ............        40G  5.7G   35G  15% /
> {noformat}
> I see this error running Cassandra 3.0.22

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