防止Cassandra转储hprof文件 [英] Preventing Cassandra from dumping hprof files

问题描述

我想阻止Cassandra转储hprof文件，因为我不需要使用它们。

我也有非常有限的磁盘空间（100GB中有50GB） GB用于数据），这些文件吞噬了所有的磁盘空间，然后才能说停止。

我该怎么办呢？

是否有可以用来擦除这些文件的shell脚本？

解决方案

这是因为Cassandra以 -XX：+ HeapDumpOnOutOfMemoryError Java选项开头。如果你想分析哪个是好东西。此外，如果你得到大量的堆转储，表明你应该调整Cassandra可用的内存。

我还没试过。但要阻止此选项，请在 $ CASSANDRA_HOME / conf / cassandra-env.sh

<$ p $中注释以下行p> JVM_OPTS =$ JVM_OPTS -XX：+ HeapDumpOnOutOfMemoryError


可选你也可以对这个区块发表评论，但我认为并不是真的需要。我猜这个版块有1.0+版本。我在0.7.3中找不到这个。

  #set jvm HeapDumpPath with CASSANDRA_HEAPDUMP_DIR 
 if [x $ CASSANDRA_HEAPDUMP_DIR！=x];然后
 JVM_OPTS =$ JVM_OPTS -XX：HeapDumpPath = $ CASSANDRA_HEAPDUMP_DIR / cassandra -`date +％s`-pid $$。hprof
 fi 
  

如果有效，请告诉我。

---

更新

...我猜是当Cassandra崩溃/关闭时，JVM会抛弃它。有什么方法可以防止这种情况发生吗？

如果要完全禁用JVM堆转储，请参见此处如何在VM崩溃后禁用创建Java堆转储？

I would like to stop Cassandra from dumping hprof files as I do not require the use of them.

I also have very limited disk space (50GB out of 100 GB is used for data), and these files swallow up all the disk space before I can say "stop".

How should I go about it?

Is there a shell script that I could use to erase these files from time to time?

解决方案

It happens because Cassandra starts with -XX:+HeapDumpOnOutOfMemoryError Java option. Which is good stuff if you want to analyze. Also, if you are getting lots of heap-dump that indicate that you should probably tune the memory available to Cassandra.

I haven't tried it. But to block this option, comment the following line in $CASSANDRA_HOME/conf/cassandra-env.sh

JVM_OPTS="$JVM_OPTS -XX:+HeapDumpOnOutOfMemoryError"

Optionally, you may comment this block as well, but not really required, I think. This block is available in 1.0+ version I guess. I can't find this in 0.7.3.

# set jvm HeapDumpPath with CASSANDRA_HEAPDUMP_DIR
if [ "x$CASSANDRA_HEAPDUMP_DIR" != "x" ]; then
    JVM_OPTS="$JVM_OPTS -XX:HeapDumpPath=$CASSANDRA_HEAPDUMP_DIR/cassandra-`date +%s`-pid$$.hprof"
fi

Let me know if this worked.

---

Update

...I guess it is JVM throwing it out when Cassandra crashes / shuts down. Any way to prevent that one from happening?

If you want to disable JVM heap-dump altogether, see here how to disable creating java heap dump after VM crashes?

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