Cassandra节点正在运行，但无法连接？

分类：编程问答

如何解决Cassandra节点正在运行，但无法连接？

使用Cassandra 3.11.8版，openjdk-8u242-b08

在崩溃之前，我正在更改具有50k +列的表，因此这可能是所有这些的一个因素。理想情况下，我宁愿丢失提交中的数据（如果仍然永久插入积压的数据），这样我就可以连接到主机，从而可以恢复服务。

在开始错误之前，我开始执行alter table命令，每次调用1000次将许多列插入表中。最终，在完成其中的一半之后，我收到了所有节点的错误消息。

2020-09-10 15:34:29警告[控制连接]连接到时出错 127.0.0.3:9042：回溯（最近一次通话最近）：文件“ cassandra \ cluster.py”，行3522，在 cassandra.cluster.ControlConnection._reconnect_internal文件 “ cassandra \ cluster.py”，第3591行，在 cassandra.cluster.ControlConnection._try_connect文件 “ cassandra \ cluster.py”，第3588行，在 cassandra.cluster.ControlConnection._try_connect文件 “ cassandra \ cluster.py”，第3690行，在 cassandra.cluster.ControlConnection._refresh_schema文件 第142行中的“ cassandra \ metadata.py” cassandra.metadata.Metadata.refresh文件“ cassandra \ metadata.py”， cassandra.metadata.Metadata._rebuild_all文件中的第165行 get_all_keyspaces文件中的“ cassandra \ metadata.py”行2522 get_all_keyspaces文件中的“ cassandra \ metadata.py”行2031 “ cassandra \ metadata.py”，第2719行，在 cassandra.metadata.SchemaParserV3._query_all文件 在“ cassandra \ connection.py”行985中 cassandra.connection.Connection.wait_for_responses文件 “ cassandra \ connection.py”，第983行，在 cassandra.connection.Connection.wait_for_responses文件 第1435行的“ cassandra \ connection.py”在 cassandra.connection.ResponseWaiter.deliver cassandra.OperationTimedOut：errors = None，last_host = None

我正在服务器上运行8个节点。我已重置所有节点，并且握手已完成。但是我无法连接到任何节点上的集群。一旦cassandra开始运行，我的system.log和debug.log都有相似的日志。 gc.log已有一段时间没有更新，所以让我想知道怎么回事？有趣的一点是，我只检索表中的列列表总计3次，我在桌面上运行此代码时使用2个节点（资源少得多）没有问题，并且没有收到任何这些问题。

编辑：为清楚起见，我的应用程序/连接未运行，并且下面的这些日志是定期发生的事情。我试图查看计划的任务，但无法找到有关cassandra的信息。我想知道它是从什么积压书中读取的，是否可以阻止它。理想情况下，我想停止这种工作负担……

-------SYSTEM.LOG-------
INFO  [GossipStage:1] 2020-09-10 17:38:52,376 StorageService.java:2400 - Node /127.0.0.9 state jump to NORMAL
WARN  [OptionalTasks:1] 2020-09-10 17:38:54,802 CassandraRoleManager.java:377 - CassandraRoleManager skipped default role setup: some nodes were not ready
INFO  [OptionalTasks:1] 2020-09-10 17:38:54,802 CassandraRoleManager.java:416 - Setup task failed with error,rescheduling
INFO  [HANDSHAKE-/127.0.0.4] 2020-09-10 17:38:56,965 OutboundTcpConnection.java:561 - Handshaking version with /127.0.0.4
INFO  [HANDSHAKE-/127.0.0.4] 2020-09-10 17:38:58,262 OutboundTcpConnection.java:561 - Handshaking version with /127.0.0.4
INFO  [GossipStage:1] 2020-09-10 17:38:59,102 Gossiper.java:1139 - Node /127.0.0.4 has restarted,now UP
INFO  [GossipStage:1] 2020-09-10 17:38:59,103 TokenMetadata.java:497 - Updating topology for /127.0.0.4
INFO  [GossipStage:1] 2020-09-10 17:38:59,105 Gossiper.java:1103 - InetAddress /127.0.0.4 is now UP
INFO  [HANDSHAKE-/127.0.0.5] 2020-09-10 17:38:59,813 OutboundTcpConnection.java:561 - Handshaking version with /127.0.0.5
INFO  [GossipStage:1] 2020-09-10 17:39:00,104 StorageService.java:2400 - Node /127.0.0.4 state jump to NORMAL
INFO  [HANDSHAKE-/127.0.0.5] 2020-09-10 17:39:01,029 OutboundTcpConnection.java:561 - Handshaking version with /127.0.0.5
INFO  [GossipStage:1] 2020-09-10 17:39:01,266 Gossiper.java:1139 - Node /127.0.0.5 has restarted,now UP
INFO  [GossipStage:1] 2020-09-10 17:39:01,267 TokenMetadata.java:497 - Updating topology for /127.0.0.5
INFO  [GossipStage:1] 2020-09-10 17:39:01,270 Gossiper.java:1103 - InetAddress /127.0.0.5 is now UP
INFO  [GossipStage:1] 2020-09-10 17:39:04,271 StorageService.java:2400 - Node /127.0.0.5 state jump to NORMAL
INFO  [ScheduledTasks:1] 2020-09-10 17:43:05,805 NoSpamLogger.java:91 - Some operations were slow,details available at debug level (debug.log)
INFO  [ScheduledTasks:1] 2020-09-10 17:48:40,892 NoSpamLogger.java:91 - Some operations were slow,details available at debug level (debug.log)
INFO  [ScheduledTasks:1] 2020-09-10 17:54:35,999 NoSpamLogger.java:91 - Some operations were slow,details available at debug level (debug.log)
INFO  [ScheduledTasks:1] 2020-09-10 17:59:36,083 NoSpamLogger.java:91 - Some operations were slow,details available at debug level (debug.log)
INFO  [Service Thread] 2020-09-10 18:00:24,722 GCInspector.java:285 - ParNew GC in 237ms.  CMS Old Gen: 717168160 -> 887151520; Par Eden Space: 1718091776 -> 0; Par Survivor Space: 12757512 -> 214695936
INFO  [ScheduledTasks:1] 2020-09-10 18:04:56,160 NoSpamLogger.java:91 - Some operations were slow,details available at debug level (debug.log)

------DEBUG.LOG------
INFO  [Service Thread] 2020-09-10 18:00:24,722 GCInspector.java:285 - ParNew GC in 237ms.  CMS Old Gen: 717168160 -> 887151520; Par Eden Space: 1718091776 -> 0; Par Survivor Space: 12757512 -> 214695936
DEBUG [ScheduledTasks:1] 2020-09-10 18:00:26,102 MonitoringTask.java:173 - 1 operations were slow in the last 4996 msecs:
<SELECT * FROM system_schema.columns>,was slow 2 times: avg/min/max 1256/1232/1281 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:00:56,110 MonitoringTask.java:173 - 1 operations were slow in the last 5007 msecs:
<SELECT * FROM system_schema.columns>,time 795 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:01:01,111 MonitoringTask.java:173 - 1 operations were slow in the last 5003 msecs:
<SELECT * FROM system_schema.columns>,time 808 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:03:41,143 MonitoringTask.java:173 - 1 operations were slow in the last 5002 msecs:
<SELECT * FROM system_schema.columns>,time 853 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:04:06,148 MonitoringTask.java:173 - 1 operations were slow in the last 4996 msecs:
<SELECT * FROM system_schema.columns>,time 772 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:04:26,153 MonitoringTask.java:173 - 1 operations were slow in the last 4991 msecs:
<SELECT * FROM system_schema.columns>,time 838 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:04:31,154 MonitoringTask.java:173 - 1 operations were slow in the last 5009 msecs:
<SELECT * FROM system_schema.columns>,time 841 msec - slow timeout 500 msec
INFO  [ScheduledTasks:1] 2020-09-10 18:04:56,details available at debug level (debug.log)
DEBUG [ScheduledTasks:1] 2020-09-10 18:04:56,160 MonitoringTask.java:173 - 1 operations were slow in the last 5004 msecs:
<SELECT * FROM system_schema.columns>,time 772 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:05:11,165 MonitoringTask.java:173 - 1 operations were slow in the last 4994 msecs:
<SELECT * FROM system_schema.columns>,time 808 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:05:31,171 MonitoringTask.java:173 - 1 operations were slow in the last 5004 msecs:
<SELECT * FROM system_schema.columns>,time 834 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:05:56,176 MonitoringTask.java:173 - 1 operations were slow in the last 5010 msecs:
<SELECT * FROM system_schema.columns>,was slow 2 times: avg/min/max 847/837/857 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:07:16,196 MonitoringTask.java:173 - 1 operations were slow in the last 5003 msecs:
<SELECT * FROM system_schema.columns>,time 827 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:07:31,200 MonitoringTask.java:173 - 1 operations were slow in the last 5007 msecs:
<SELECT * FROM system_schema.columns>,time 834 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:08:01,207 MonitoringTask.java:173 - 1 operations were slow in the last 5000 msecs:
<SELECT * FROM system_schema.columns>,time 799 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:08:16,211 MonitoringTask.java:173 - 1 operations were slow in the last 4999 msecs:
<SELECT * FROM system_schema.columns>,time 780 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:08:36,217 MonitoringTask.java:173 - 1 operations were slow in the last 5000 msecs:
<SELECT * FROM system_schema.columns>,time 835 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:09:01,221 MonitoringTask.java:173 - 1 operations were slow in the last 5002 msecs:
<SELECT * FROM system_schema.columns>,time 832 msec - slow timeout 500 msec
INFO  [ScheduledTasks:1] 2020-09-10 18:09:56,231 NoSpamLogger.java:91 - Some operations were slow,details available at debug level (debug.log)
DEBUG [ScheduledTasks:1] 2020-09-10 18:09:56,231 MonitoringTask.java:173 - 1 operations were slow in the last 4995 msecs:
<SELECT * FROM system_schema.columns>,time 778 msec - slow timeout 500 msec
DEBUG [ScheduledTasks:1] 2020-09-10 18:10:06,233 MonitoringTask.java:173 - 1 operations were slow in the last 5009 msecs:
<SELECT * FROM system_schema.columns>,time 1099 msec - slow timeout 500 msec

解决方法

超时是由于驱动程序试图在建立控制连接时解析架构而引起的。

驱动程序将控制连接用于管理任务，例如在初始化阶段发现集群的拓扑和架构。我已经在这篇帖子中进行了更详细的讨论-https://community.datastax.com/questions/7702/。

在您的情况下，驱动程序初始化在解析您提到的表中的数千列时超时。我必须承认这对我来说是新的。我从来没有使用过具有数千列的集群，所以我很好奇知道您的用例是什么，也许有一个更好的数据模型。

作为一种解决方法，您可以尝试消除默认超时，以查看驱动程序是否最终能够初始化。但是，这将成为一个临时解决方案，因为驱动程序每次发生DDL时都需要解析该架构。干杯！

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