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https://issues.apache.org/jira/browse/CASSANDRA-20051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17896394#comment-17896394
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Stefan Miklosovic edited comment on CASSANDRA-20051 at 11/7/24 4:39 PM:
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[~jjirsa] btw, I am not sure if it is done on purpose or not but for now, we
can put whatever IP addresses / seeds to seed list and reload. If IP address is
completely made up or a typo is done, then nothing prevents that from having
that as a seed. Is not this wrong? Should not we sanitize such list? E.g. to
check if there is a node in a cluster under such IP? Is there a use case when I
want to set a seed to point to an address behind which no node is running?
was (Author: smiklosovic):
[~jjirsa] btw, I am not sure if it is done on purpose or not but for now, we
can put whatever IP addresses / seeds to seed list and reload. If IP address is
completely made up or a typo is done, then nothing block that to be considered
to be a seed. Is not this wrong? Should not we sanitize such list? E.g. to
check if there is a node in a cluster under such IP? Is there a use case when I
want to set a seed to point to an address behind which no node is running?
> nodetool reloadseeds does not reliably reload the seeds
> -------------------------------------------------------
>
> Key: CASSANDRA-20051
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20051
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Config
> Reporter: Tibor Repasi
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 4.0.x, 4.1.x, 5.0.x, 5.x
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> During re-deploying lots of Cassandra nodes I've observed that some nodes
> does not reliably reload the seeds when {{nodetool reloadseeds}} command was
> issued.
> After the seeds list was changed in the config:
> {code}
> $ grep seeds /etc/cassandra/cassandra.yaml
> - seeds: 10.90.44.82
> $ nodetool getseeds
> Current list of seed node IPs, excluding the current node's IP:
> /10.90.40.86:7000 /10.90.44.86:7000
> $ nodetool reloadseeds
> Updated seed node IP list, excluding the current node's IP: /10.90.40.86:7000
> /10.90.44.86:7000
> {code}
> At this instance the following line was logged to debug.log:
> {code}
> DEBUG [RMI TCP Connection(103568)-127.0.0.1] 2024-11-04 14:04:27,638
> YamlConfigurationLoader.java:124 - Loading settings from
> file:/etc/cassandra/cassandra.yaml
> {code}
> However, getting the old list:
> {code}
> $ nodetool getseeds
> Current list of seed node IPs, excluding the current node's IP:
> /10.90.40.86:7000 /10.90.44.86:7000
> {code}
> These nodes read the seed list only after Cassandra was restarted:
> {code}
> $ sudo systemctl restart cassandra.service
> $ nodetool getseeds
> Seed node list does not contain any remote node IPs
> {code}
> Note: this was observed on a seed node.
> Observed on Cassandra 4.1.7.
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