[Cassandra] Increase RLIMIT_MEMLOCK for cassandra，

和通数据库htsjk.Com2019-08-02 23:36 来源:未知阅读:425 评论 156 热度5

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[Cassandra] Increase RLIMIT_MEMLOCK for cassandra，

环境：

CentOS6.5

Cassnadra3.10

问题：Cassandra WARN级别日志

WARN  [main] 2018-04-11 13:32:51,296 CLibrary.java:178 - Unable to lock JVM memory (ENOMEM). This can result in part of the JVM being swapped out, especially with mmapped I/O enabled. Increase RLIMIT_MEMLOCK or run Cassandra as root.

WARN  [main] 2018-04-11 13:32:51,296 CLibrary.java:178 - Unable to lock JVM memory (ENOMEM). This can result in part of the JVM being swapped out, especially with mmapped I/O enabled. Increase RLIMIT_MEMLOCK or run Cassandra as root.

我的Cassandra是以cassandra用户运行的，不是root，按照WARN提示将RLIMIT_MEMLOCK增大。

问题解决：

步骤一: 修改limits.conf

vi /etc/security/limits.conf

写入

cassandra - memlock unlimited
cassandra - nofile 100000
cassandra - nproc 32768
cassandra - as unlimited

其中，cassandra是我运行cassandra服务的用户名。

步骤二：修改90-nproc.conf

vi /etc/security/limits.d/90-nproc.conf

写入

cassandra - nproc 32768

步骤三：修改 sysctl.conf

vi /etc/sysctl.conf

写入

# Increase RLIMIT_MEMLOCK for cassandra
vm.max_map_count = 1048575

步骤四：让配置生效

sysctl -p

步骤五：重启cassandra服务

步骤六：查看修改后的参数已经生效

cat /proc/cassandra_pid/limits

其中，cassandra_pid为cassandra服务的进程id

其他操作系统配置参考官方文档：https://docs.datastax.com/en/dse-trblshoot/doc/troubleshooting/insufficientResources.html