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https://issues.apache.org/jira/browse/HBASE-21874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16770972#comment-16770972
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Wellington Chevreuil commented on HBASE-21874:
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Thanks for the extra details, [~anoop.hbase]. Only an additional question here,
I guess it's same [~vrodionov] has raised before, when you say:
{quote}
The new IOEngine is a mix of mmap engine and off heap where the caching buffers
are created using mmap calls and the reads happens with out copy to on heap but
direct from that cached area.
{quote}
My understanding is that this is achieved by the driver itself, as we can see
PmemIOEngine only overrides read() method to sign deserializers that memory
type is shared.
> 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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