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https://issues.apache.org/jira/browse/HBASE-10866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13958639#comment-13958639
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Andrew Purtell commented on HBASE-10866:
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bq. Regarding "all RegionServers cache the data that would need be the full set
of RegionServers" - current caches keep the data on each regionserver, and then
evict/add elements when triggered by certain event, right? So if the notion of
"triggering event" is abstracted, then the implementation of trigger may be ZK
watcher called from ZK, or paxos agreement reached upon the proposal (in case
of paxos).
Yes, I just want to make sure that the distributed cache case is called out,
because if a small group of processes running the consensus protocol agree and
this triggers some kind of event notification, that's fine; but if all
regionservers holding such a cache must participate in the protocol to be aware
of a change then that won't scale.
> Decouple HLogSplitterHandler from ZooKeeper
> -------------------------------------------
>
> Key: HBASE-10866
> URL: https://issues.apache.org/jira/browse/HBASE-10866
> Project: HBase
> Issue Type: Improvement
> Components: regionserver, Zookeeper
> Reporter: Mikhail Antonov
> Attachments: HBASE-10866.patch, HBASE-10866.patch, HBASE-10866.patch,
> HBASE-10866.patch, HBaseConsensus.pdf
>
>
> As some sort of follow-up or initial step towards HBASE-10296...
> Whatever consensus algorithm/library may be the chosen, perhaps on of first
> practical steps towards this goal would be to better abstract ZK-related API
> and details, which are now throughout the codebase (mostly leaked throuth
> ZkUtil, ZooKeeperWatcher and listeners).
> I'd like to propose a series of patches to help better abstract out zookeeper
> (and then help develop consensus APIs).
> Here is first version of patch for initial review (then I'm planning to work
> on another handlers in regionserver, and then perhaps start working on
> abstracting listeners).
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