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https://issues.apache.org/jira/browse/HBASE-21874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16782042#comment-16782042
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Sean Busbey commented on HBASE-21874:
-------------------------------------
Overall, docs of the {{hbase.bucketcache.ioengine}} config need to be updated
to cover the addition of pmem. e.g.
* hbase-common/src/main/resources/hbase-default.xml
* src/main/asciidoc/_chapters/hbase-default.adoc
* src/main/asciidoc/_chapters/architecture.adoc
Since we're building off of the mmap implementation we should probably
specifically call out that it's currently treated as non-persistent and e.g.
{{hbase.bucketcache.persistent.path}} doesn't matter.
in BucketCache.java
{code}
+ } else if (ioEngineName.startsWith("pmem:")) {
+ return new PmemIOEngine(ioEngineName.substring(5), capacity);
} else {
throw new IllegalArgumentException(
"Don't understand io engine name for cache- prefix with file:,
files:, mmap: or offheap");
{code}
Update IAE text to include pmem.
> 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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