我有6个节点,1个Solr, 5个Spark节点,使用datastax。我的集群位于与Amazon EC2类似的服务器上,具有EBS卷。每个节点有3个EBS卷,它们使用LVM组成一个逻辑数据磁盘。在我的OPS中心,同一节点经常变得无响应,这导致我的数据系统连接超时。我的数据量约为400GB,有3个副本。我有20流作业与批处理间隔每分钟。下面是我的错误提示:
/var/log/cassandra/output.log:WARN 13:44:31,868 Not marking nodes down due to local pause of 53690474502 > 5000000000
/var/log/cassandra/system.log:WARN [GossipTasks:1] 2016-09-25 16:40:34,944 FailureDetector.java:258 - Not marking nodes down due to local pause of 64532052919 > 5000000000
/var/log/cassandra/system.log:WARN [GossipTasks:1] 2016-09-25 16:59:12,023 FailureDetector.java:258 - Not marking nodes down due to local pause of 66027485893 > 5000000000
/var/log/cassandra/system.log:WARN [GossipTasks:1] 2016-09-26 13:44:31,868 FailureDetector.java:258 - Not marking nodes down due to local pause of 53690474502 > 5000000000
编辑:这些是我更具体的配置。我想知道我是否做错了什么,如果是这样,我怎么能详细了解它是什么,以及如何解决它?
out堆设置为
MAX_HEAP_SIZE="16G"
HEAP_NEWSIZE="4G"
当前堆:
[root@iZ11xsiompxZ ~]# jstat -gc 11399
S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT
0.0 196608.0 0.0 196608.0 6717440.0 2015232.0 43417600.0 23029174.0 69604.0 68678.2 0.0 0.0 1041 131.437 0 0.000 131.437
[root@iZ11xsiompxZ ~]# jmap -heap 11399
Attaching to process ID 11399, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.102-b14
using thread-local object allocation.
Garbage-First (G1) GC with 23 thread(s)
堆配置:MinHeapFreeRatio = 40
MaxHeapFreeRatio = 70
MaxHeapSize = 51539607552 (49152.0MB)
NewSize = 1363144 (1.2999954223632812MB)
MaxNewSize = 30920409088 (29488.0MB)
OldSize = 5452592 (5.1999969482421875MB)
NewRatio = 2
SurvivorRatio = 8
MetaspaceSize = 21807104 (20.796875MB)
CompressedClassSpaceSize = 1073741824 (1024.0MB)
MaxMetaspaceSize = 17592186044415 MB
G1HeapRegionSize = 16777216 (16.0MB)
堆使用情况:
G1 Heap:
regions = 3072
capacity = 51539607552 (49152.0MB)
used = 29923661848 (28537.427757263184MB)
free = 21615945704 (20614.572242736816MB)
58.059545404588185% used
G1 Young Generation:
Eden Space:
regions = 366
capacity = 6878658560 (6560.0MB)
used = 6140461056 (5856.0MB)
free = 738197504 (704.0MB)
89.26829268292683% used
Survivor Space:
regions = 12
capacity = 201326592 (192.0MB)
used = 201326592 (192.0MB)
free = 0 (0.0MB)
100.0% used
G1 Old Generation:
regions = 1443
capacity = 44459622400 (42400.0MB)
used = 23581874200 (22489.427757263184MB)
free = 20877748200 (19910.572242736816MB)
53.04110320109241% used
40076 interned Strings occupying 7467880 bytes.
我不知道为什么会这样。非常感谢。
您看到的Not marking nodes down due to local pause
消息是由于JVM暂停所致。虽然您在这里通过发布JVM信息做了一些好事,但通常一个好的起点只是查看/var/log/cassandra/system.log
,例如检查ERROR
, WARN
等内容。还可以通过greping GCInspector
检查GC事件的长度和频率。
工具,如nodetool tpstats
在这里是你的朋友,看看你是否已经备份或删除了突变,阻塞了刷新写器等等。
这里的文档有一些好的东西需要检查:https://docs.datastax.com/en/landing_page/doc/landing_page/troubleshooting/cassandra/cassandraTrblTOC.html
还要检查您的节点是否具有推荐的生产设置,这是经常被忽视的:
http://docs.datastax.com/en/landing_page/doc/landing_page/recommendedSettingsLinux.html还有一点需要注意的是,Cassandra对i/o相当敏感,"正常"的EBS可能不够快,无法满足您在这里的需要。把Solr也加入其中,当你遇到Cassandra压缩和Lucene合并同时占用磁盘时,你会看到很多i/o争用。