[CASSANDRA-18376] CEP-15 (Accord) NPE in accord.topology.TopologyManager.localForEpoch

• Type: Bug
• Status: Open
• Priority: Normal
• Resolution: Unresolved
• Fix Version/s: 5.x
• Component/s: Accord
• Bug Category: Correctness - Unrecoverable Corruption / Loss
• Severity: Normal
• Complexity: Normal
• Discovered By: Fuzz Test
• Platform: All
• Assignee: Unassigned
• Reporter: David Capwell
• Created: 28/Mar/23 20:54
• Updated: 28/Mar/23 20:54

Description

java.lang.NullPointerException
	at accord.topology.TopologyManager.localForEpoch(TopologyManager.java:402)
	at accord.local.Node.trySelectProgressKey(Node.java:431)
	at accord.messages.TxnRequest.progressKey(TxnRequest.java:151)
	at accord.messages.TxnRequest.process(TxnRequest.java:143)
	at org.apache.cassandra.service.accord.AccordVerbHandler.doVerb(AccordVerbHandler.java:46)

accord.topology.TopologyManager.Epochs#get is able to return null, yet the callers do not handle

private EpochState get(long epoch)
{
    if (epoch > currentEpoch || epoch <= currentEpoch - epochs.length)
        return null;

    return epochs[(int) (currentEpoch - epoch)];
}

Issue Links

• blocks: CASSANDRA-18196 Initial Merge of Accord Feature Branch to Trunk