Aleksey Yeschenko created CASSANDRA-15176:
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Summary: Fix PagingState deserialization when the state was
serialized using protocol version different from current session's
Key: CASSANDRA-15176
URL: https://issues.apache.org/jira/browse/CASSANDRA-15176
Project: Cassandra
Issue Type: Bug
Components: Messaging/Client
Reporter: Aleksey Yeschenko
Assignee: Aleksey Yeschenko
3.0 and native protocol V4 introduced a change to how {{PagingState}} is
serialized. Unfortunately that can break requests during upgrades: since paging
states are opaque, it's possible for a client to receive a paging state encoded
as V3 on a 2.1 node, and then send it to a 3.0 node on a V4 session. The
version of the current session will be used to deserialize the paging state,
instead of the actual version used to serialize it, and the request will fail.
This is obviously sub-optimal, but also avoidable. This JIRA fixes one half of
the problem: 3.0 failing to deserialize 'mislabeled' paging states. We can do
this by inspecting the byte buffer to verify if it's been indeed serialized
with the protocol version used by the session, and if not, use the other method
of deserialization.
It should be noted that we list this as a 'known limitation' somewhere, but
really this is an upgrade-blocking bug for some users of C*.
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