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https://issues.apache.org/jira/browse/HBASE-21874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16769893#comment-16769893
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Wellington Chevreuil commented on HBASE-21874:
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So in this case, assuming device is mounted in "memory mode" describedÂ
[here|https://software.intel.com/en-us/blogs/2018/10/30/intel-optane-dc-persistent-memory-a-major-advance-in-memory-and-storage-architecture],
it works as an extension of main memory? But we still have to access it as a
mmap?
{noformat}
the operating system sees the persistent memory module capacity as the system
main memory. For example, on a common two-socket system, the Memory Mode can
provide 6 TB of main memory, something very difficult and expensive to do with
DRAM (if it is even possible). In Memory Mode, the DRAM installed in the system
acts as a cache to deliver DRAM-like performance for this high-capacity main
memory.
{noformat}
> Bucket cache on Persistent memory
> ---------------------------------
>
> Key: HBASE-21874
> URL: https://issues.apache.org/jira/browse/HBASE-21874
> Project: HBase
> Issue Type: New Feature
> Components: BucketCache
> Affects Versions: 3.0.0
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Priority: Major
> Fix For: 3.0.0
>
> Attachments: HBASE-21874.patch, HBASE-21874.patch,
> HBASE-21874_V2.patch, Pmem_BC.png
>
>
> Non volatile persistent memory devices are byte addressable like DRAM (for
> eg. Intel DCPMM). Bucket cache implementation can take advantage of this new
> memory type and can make use of the existing offheap data structures to serve
> data directly from this memory area without having to bring the data to
> onheap.
> The patch is a new IOEngine implementation that works with the persistent
> memory.
> Note : Here we don't make use of the persistence nature of the device and
> just make use of the big memory it provides.
> Performance numbers to follow.
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