[
https://issues.apache.org/jira/browse/CASSANDRA-10143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14706849#comment-14706849
]
Aleksey Yeschenko commented on CASSANDRA-10143:
-----------------------------------------------
No ideas, don't see how this can be possible. Will have a look at code/test
once 3.0 is out.
> Apparent counter overcount during certain network partitions
> ------------------------------------------------------------
>
> Key: CASSANDRA-10143
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10143
> Project: Cassandra
> Issue Type: Bug
> Reporter: Joel Knighton
> Assignee: Aleksey Yeschenko
> Fix For: 2.1.x, 2.2.x, 3.0.x
>
>
> This issue is reproducible in this [Jepsen
> Test|https://github.com/riptano/jepsen/blob/f45f5320db608d48de2c02c871aecc4910f4d963/cassandra/test/cassandra/counter_test.clj#L16].
> The test starts a five-node cluster and issues increments by one against a
> single counter. It then checks that the counter is in the range [OKed
> increments, OKed increments + Write Timeouts] at each read. Increments are
> issued at CL.ONE and reads at CL.ALL. Throughout the test, network failures
> are induced that create halved network partitions. A halved network partition
> splits the cluster into three connected nodes and two connected nodes,
> randomly.
> This test started failing; bisects showed that it was actually a test change
> that caused this failure. When the network partitions are induced in a cycle
> of 15s healthy/45s partitioned or 20s healthy/45s partitioned, the test
> failes. When network partitions are induced in a cycle of 15s healthy/60s
> partitioned, 20s healthy/45s partitioned, or 20s healthy/60s partitioned, the
> test passes.
> There is nothing unusual in the logs of the nodes for the failed tests. The
> results are very reproducible.
> One noticeable trend is that more reads seem to get serviced during the
> failed tests.
> Most testing has been done in 2.1.8 - the same issue appears to be present in
> 2.2/3.0/trunk, but I haven't spent as much time reproducing.
> Ideas?
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
