如何将Cassandra(> 2.0)JVM堆大小设置为8GB? [英] How to set Cassandra (>2.0) JVM heap size of 8GB?

问题描述

如何将Cassandra(> 2.0)JVM堆大小设置为8GB?当我键入free -m时，将显示以下内容.如何将Cassandra JVM堆大小设置为8GB?

How to set Cassandra (>2.0) JVM heap size of 8GB? When I type in free -m it gives me the following. How can I set the Cassandra JVM heap size to 8GB?

             total       used       free     shared    buffers     cached
Mem:         16047      11336       4711          0         81       5814
-/+ buffers/cache:       5441      10606
Swap:            0          0          0

推荐答案

如调整文档的Java资源部分:

如果您决定更改Java堆大小，则应在conf/cassandra-env.sh中一起设置MAX_HEAP_SIZE和HEAP_NEWSIZE.

If you decide to change the Java heap sizing, both MAX_HEAP_SIZE and HEAP_NEWSIZE should should be set together in conf/cassandra-env.sh.

在cassandra-env.sh内，搜索以下行:

Inside cassandra-env.sh, search for this line:

#MAX_HEAP_SIZE="4G"

代码中的那一行在发生MAX_HEAP_SIZE计算之后发生，因此它可以作为替代.取消注释，然后进行相应设置.

That line in the code happens after the MAX_HEAP_SIZE calculations have happened, so it works as an override. Uncomment it, and set it accordingly.

MAX_HEAP_SIZE="8G"

请注意超过8G.有关调整JVM的指导，我建议 Amy Tobey的Cassandra 2.1调整指南.她提供了一些有关调整CMS的技巧，以及有关实施新G1GC的重要部分.

Be careful going above 8G. For guidance on tuning the JVM, I recommend Amy Tobey's Cassandra 2.1 Tuning Guide. She offers some tips for tuning CMS, as well as a great section on implementing the new G1GC.

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