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https://issues.apache.org/jira/browse/HBASE-20234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16428871#comment-16428871
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Anastasia Braginsky commented on HBASE-20234:
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{quote}Do we have access to Fetch-And-Increment from java?
{quote}
I looked around and found those links:
[http://ashkrit.blogspot.co.il/2014/02/atomicinteger-java-7-vs-java-8.html]
It appears that since Java8 there are some intrinsic function to change CAS to
F&I in Java8
[http://ashkrit.blogspot.co.il/2017/07/java-intrinsic-magic.html]
I can not find F&I in the Unsafe class, although it is reasonable to support it.
{quote}The counters may be local to Store but they are updated by multiple
threads so they'll be contended, no? I suppose if the counter is at
region-level, there'll be more contention....
{quote}
The in-memory-compaction counters per-store should have no contention as there
can be only one in-memory-compaction at a store in specific point in time. Of
course, such per-region counters will experience contention.
> Expose in-memory compaction metrics
> -----------------------------------
>
> Key: HBASE-20234
> URL: https://issues.apache.org/jira/browse/HBASE-20234
> Project: HBase
> Issue Type: Sub-task
> Reporter: stack
> Assignee: Anastasia Braginsky
> Priority: Major
>
> Hard to glean insight from how well in-memory compaction is doing currently.
> It dumps stats into the logs but better if they were available to a
> dashboard. This issue is about exposing a couple of helpful counts. There are
> already by-region metrics. We can add a few for in-memory compaction (Help me
> out [~anastas]... what counts would be best to expose).
> Flush related metrics include....
> {code}
> Namespace_default_table_tsdb-tree_region_cfbf23e7330a1a2bbde031f9583d3415_metric_flushesQueuedCount:
> {
> description: "Number flushes requested/queued for this region",
> value: 0
> {
> description: "The number of cells flushed to disk",
> value: 0
> },
> {
> description: "The total amount of data flushed to disk, in bytes",
> value: 0
> },
> ...
> {code}
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