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https://issues.apache.org/jira/browse/CASSANDRA-19394?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Miklosovic updated CASSANDRA-19394:
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Resolution: Won't Fix
Status: Resolved (was: Triage Needed)
> Rethink dumping of cluster metadata via CMSOperationsMBean
> ----------------------------------------------------------
>
> Key: CASSANDRA-19394
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19394
> Project: Cassandra
> Issue Type: Improvement
> Components: Tool/nodetool, Transactional Cluster Metadata
> Reporter: Stefan Miklosovic
> Priority: Normal
>
> I think there are two problems in the implementation of dumping
> ClusterMetadata in CMSOperationsMBean
> 1) A dump is saved in a file and dumpClusterMetadata methods will return just
> a file name where that dump is. However, nodetool / JMX call to MBean (or any
> place this method is invoked from, we would like to offer a command in
> nodetool which returns the dump) is meant to be used from anywhere, remotely,
> so what happens when we execute nodetool or call these methods on a machine
> different from a machine a node runs on? E.g. admins can just have some
> jumpbox to a cluster they manage, they do not necessarily have access to
> nodes themselves. So they would not be able to read it.
> 2) It creates temp file which is not deleted so /tmp will be populated with
> these dumps until node is turned off which might take a lot of time and can
> consume a lot of disk space if dumps are done frequently and they are big. An
> adversary might just dump cluster metadata until no disk space is left.
> What I propose is that we would return all dump string, not just a filename
> where we save it. We can also format the output on the client or we can tell
> server what format we want the dump to be returned in.
> If there is a concern about size of data to be returned, we might optionally
> allow dumps to be returned as compressed by simple zipping on server and
> unzipping on client where "zipper" is a standard java.util.zip so it
> basically doesn't matter what jvm runs on client and server.
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