[jira] [Created] (CASSANDRA-20670) IntrusiveStack.accumulate is not accumulating correctly

["Yuqi Yan (Jira)" <ji...@apache.org>]

Yuqi Yan created CASSANDRA-20670:
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             Summary: IntrusiveStack.accumulate is not accumulating correctly
                 Key: CASSANDRA-20670
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20670
             Project: Apache Cassandra
          Issue Type: Bug
            Reporter: Yuqi Yan
            Assignee: Yuqi Yan


{code:java}
protected static <T extends IntrusiveStack<T>> long accumulate(T list, LongAccumulator<T> accumulator, long initialValue)
{
    long value = initialValue;
    while (list != null)
    {
        value = accumulator.apply(list, initialValue);
                                          ^^^
        list = list.next;
    }
    return value;
} {code}
Seems we're restarting from the beginning every time when accumulating. This is used in Paxos V2 when aggregating the responses from peers.

Added a simple unit test around FailureRecordingCallback to reproduce this



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