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在运行了大约 3 个月的 activemq 代理后，它非常慢，如下所示。当它重新启动时，它恢复正常（大约 600 毫秒 - 1000 毫秒）。

我正在寻找问题的原因。HD 速度非常快，1K rpm，IO 不多。如果您知道/（可以猜到）问题的原因和解决方案，请告诉我。

    2012-08-27 19:24:06,670 | INFO  | Slow KahaDB access: cleanup took 7190 | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal Checkpoint Worker
    2012-08-27 21:44:14,814 | INFO  | Slow KahaDB access: cleanup took 7176 | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal Checkpoint Worker
    2012-08-27 23:58:15,124 | INFO  | Slow KahaDB access: cleanup took 7210 | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal Checkpoint Worker
    2012-08-28 02:09:03,120 | INFO  | Slow KahaDB access: cleanup took 7212 | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal Checkpoint Worker
    2012-08-28 04:27:46,521 | INFO  | Slow KahaDB access: cleanup took 7196 | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal Checkpoint Worker
    2012-08-28 06:36:38,818 | INFO  | Slow KahaDB access: cleanup took 7191 | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal Checkpoint Worker
    2012-08-28 08:28:09,937 | INFO  | Slow KahaDB access: Journal append took: 13 ms, Index update took 7165 ms | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Transport: tcp:///127.0.0.1:39951
    2012-08-28 08:29:01,715 | INFO  | Slow KahaDB access: Journal append took: 18 ms, Index update took 7171 ms | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Transport: tcp:///127.0.0.1:39951
    2012-08-28 08:29:26,039 | INFO  | Slow KahaDB access: Journal append took: 30 ms, Index update took 7194 ms | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Transport: tcp:///127.0.0.1:39951
    2012-08-28 08:29:52,283 | INFO  | Slow KahaDB access: Journal append took: 7193 ms, Index update took 116 ms | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Transport: tcp:///127.0.0.1:39951
    2012-08-28 08:30:12,140 | INFO  | Slow KahaDB access: Journal append took: 0 ms, Index update took 7596 ms | org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Transport: tcp:///127.0.0.1:39956
    2012-08-28 08:30:25,763 | INFO  | Slow KahaDB access: Journal append took: 11 ms, Index update took 7760 ms |

感谢你们。

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我们遇到了同样的问题，结果证明是内存泄漏（对象永远不会从集合中删除）。尝试运行 java 内存分析器并观察几天内内存的逐渐增长。在我们的案例中，JRockit “任务控制”非常棒。

于 2012-10-04T10:49:38.653 回答