本文介绍了当Cassandra出现特定的内存错误时如何排查及解决。主要针对'java.lang.OutOfMemoryError:Map failed'这一错误，分析了该问题通常是由Linux系统限制内存锁定所导致，并提供了检查和调整内存限制的方法。
Cassandra dies with "java.lang.OutOfMemoryError: Map failed"
IF Cassandra is dying specifically with the "Map failed" message it means the OS is denying java the ability to lock more memory. In linux, this typically means memlock is limited. Check /proc/<pid of cassandra>/limits to verify this and raise it (eg, via ulimit in bash.) You may also need to increase vm.max_map_count. Note that the debian and redhat packages handle this for you automatically.
http://wiki.apache.org/cassandra/FAQ#mmap
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