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https://issues.apache.org/jira/browse/CASSANDRA-20491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov reassigned CASSANDRA-20491:
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Assignee: Dmitry Konstantinov
> Document offheap memory used by Cassandra
> -----------------------------------------
>
> Key: CASSANDRA-20491
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20491
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Documentation
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
>
> There are many places where Cassandra uses offheap memory and several methods
> to do it, it would be nice to have a summary doc about this usage.
> A draft version:
> ||Case||Off-heap memory type||Way to monitor||Related configuration||
> |offheap_buffers memtables|Direct byte buffer| | |
> |offheap_object memtables|Native allocator| | |
> |Chunk cache| | | |
> |Hints| | | |
> |Repair Merkle trees| | | |
> |Bloom filters|Native allocator| | |
> |Index summaries|Native allocator| | |
> |Compression metadata|Native allocator| | |
> |Direct IO commitlog | | | |
> |Compression| | | |
> |Netty PooledByteBufAllocator|Unsafe.allocateMemory| | |
> | | | | |
> | | | | |
> Off-heap memory types:
>
> ||Type||Allocation logic||Monitoring||Limit||
> |Direct byte buffer| ByteBuffer.allocateDirect(size)|JMX:
> java.nio:name=direct,type=BufferPool|-XX:MaxDirectMemorySize|
> |Native allocator|org.apache.cassandra.utils.memory.MemoryUtil#allocate
> com.sun.jna.Native#malloc| | |
> |Unsafe.allocateMemory|Unsafe.allocateMemory| | |
>
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