[jboss-jira] [JBoss JIRA] (WFLY-12937) Expired distributed web sessions/SFSBs not properly removed following rehash

[Paul Ferraro (Jira)]

Paul Ferraro created WFLY-12937:
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             Summary: Expired distributed web sessions/SFSBs not properly removed following rehash
                 Key: WFLY-12937
                 URL: https://issues.redhat.com/browse/WFLY-12937
             Project: WildFly
          Issue Type: Bug
          Components: Clustering
    Affects Versions: 18.0.1.Final
            Reporter: Paul Ferraro
            Assignee: Paul Ferraro


On topology change, changes to primary session ownership determine when a given member should schedule expiration of a given session, or cancel a scheduled expiration of a previously owned session. Primary ownership is determined by 2 components: the key partitioner and a consistent hash. The key partitioner determines which the segment to which a given key is assigned. A consistent hash determines which member is the primary owner of a given segment.

The logic for determining primary ownership changes currently uses the wrong key partitioner. Currently, we use the partitioner from the cache configuration. However, when grouping is enabled (which is the case for web sessions and SFSBs), this parititioner is wrapped by a GroupPartitioner at runtime. That is the one we need.

This results in expired web sessions/SFSBs remaining in memory, potentially indefinitely.



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