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https://issues.apache.org/jira/browse/HDDS-3626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17757613#comment-17757613
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Siyao Meng commented on HDDS-3626:
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Block size might be the main one we need to look at in regards to RocksDB
tunables:
{code}
table_options.block_cache
{code}
https://github.com/facebook/rocksdb/wiki/Memory-usage-in-RocksDB
> Limit the off-heap memory of RocksDB in datanode
> ------------------------------------------------
>
> Key: HDDS-3626
> URL: https://issues.apache.org/jira/browse/HDDS-3626
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: runzhiwang
> Assignee: runzhiwang
> Priority: Major
> Attachments: image-2020-05-20-17-07-30-542.png
>
>
> Datanode occupy 5.2GB physical memory, Xmx is 2200m, MaxDirectMemorySize is
> 800m, so there is at least 2.2GB memory occupied by RocksDB. I also track
> the memory allocated in datanode, you can find RocksDB allocate 74.2% of the
> total memory.
> !image-2020-05-20-17-07-30-542.png!
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