我最近在我的生产集群和演示集群的system.log文件中都遇到了以下错误。每个集群有2个节点，复制因子为2。我的知识没有改变。我搞不懂这个错误背后的原因是什么。它导致insert和update语句失败。

[SharedPool-Worker-27] ERROR org.apache.cassandra.transport.Message - Unexpected exception during request; channel = [id: 0xeb429d31, /14.0.0.1:34495 => /14.0.0.2:9042]                
    java.lang.AssertionError: -2146739295
    at org.apache.cassandra.db.BufferExpiringCell.<init>(BufferExpiringCell.java:46) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.db.BufferExpiringCell.<init>(BufferExpiringCell.java:39) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.db.AbstractCell.create(AbstractCell.java:176) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.cql3.UpdateParameters.makeColumn(UpdateParameters.java:65) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.cql3.Constants$Setter.execute(Constants.java:314) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.cql3.statements.UpdateStatement.addUpdateForKey(UpdateStatement.java:110) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.cql3.statements.UpdateStatement.addUpdateForKey(UpdateStatement.java:57) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.cql3.statements.ModificationStatement.getMutations(ModificationStatement.java:708) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.cql3.statements.ModificationStatement.executeWithoutCondition(ModificationStatement.java:495) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.cql3.statements.ModificationStatement.execute(ModificationStatement.java:481) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:238) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:493) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.transport.messages.ExecuteMessage.execute(ExecuteMessage.java:138) ~[apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:439) [apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:335) [apache-cassandra-2.1.10.jar:2.1.10]
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.0.23.Final.jar:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [netty-all-4.0.23.Final.jar:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext.access$700(AbstractChannelHandlerContext.java:32) [netty-all-4.0.23.Final.jar:4.0.23.Final]
    at io.netty.channel.AbstractChannelHandlerContext$8.run(AbstractChannelHandlerContext.java:324) [netty-all-4.0.23.Final.jar:4.0.23.Final]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_45]
    at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164) [apache-cassandra-2.1.10.jar:2.1.10]
    at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [apache-cassandra-2.1.10.jar:2.1.10]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_45]

这些是异步请求。在客户端，我也看到了未来的失败。我使用的是cassandra-2.1.10。我还没有完成节点的滚动重启，但我认为这不会解决问题。
我们还注意到，失败的插入/更新似乎发生在几个成功的插入/更新之后。请求语句本身（格式）很好。任何帮助都将不胜感激。
更新：我查看了Cassandra的源代码。它包含以下内容：

assert timeToLive > 0 : timeToLive;
assert localExpirationTime > 0 : localExpirationTime;

看起来它在第二个assert语句中失败了。表的属性中设置了一个ttl值，持续1728000秒。insert/update语句中没有设置ttl。所以我不明白为什么有些陈述在这个Assert上失败了。
编辑：在客户端应用程序上，我看到以下错误消息：
客户端1连接到群集1：

16:36:01.102 [New I/O worker #64] WARN  - /14.0.0.2:9042 replied with server error (java.lang.AssertionError: -2146571535), trying next host

客户端2连接到群集2：

16:30:01.302 [cluster1-nio-worker-7] WARN  - /14.0.0.4:9042 replied with server error (java.lang.AssertionError: -2146571895), defuncting connection.

我相信当上述错误发生时，客户端会断开连接并重新连接。在此期间，其他异步请求失败。