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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14055) Untangle region - region server dependencies
Date Fri, 10 Jul 2015 17:18:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14622609#comment-14622609
] 

stack commented on HBASE-14055:
-------------------------------

What is requestSystemCompaction?

How much of this patch comes from the region-as-pv2-store experiment, if any?

What is going on with this change where compactions and memstore checker are no longer ScheduledChores?

	  CompactionChecker compactionChecker;

Ditto memstore checker.

Does this undo work reducing running chore thread count?

On

    private final List<RegionServices> regionServices = new CopyOnWriteArrayList<>();

When would RegionServices change out from under us? Or is this just around starting and stopping
so RegionServices not pulled from under running chores?

Apart from above nits, its nice. +1  Are javadoc and checkstyle warnings yours?  When we going
to have  hbase-region and hbase-wal modules?


> Untangle region - region server dependencies
> --------------------------------------------
>
>                 Key: HBASE-14055
>                 URL: https://issues.apache.org/jira/browse/HBASE-14055
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: hbase-14055_v1.patch
>
>
> We need to untangle region from outside of region server. The parent jira is trying to
create an embedded library, like leveldb, out of region so that it should be possible to host
a set of regions without being a regionserver. 
> From a layering point of view, region hosting and WAL services should be abstracted.
Hosting a region means threads for flushing, compaction, cleanups, hosting a WAL, and block
cache. The RegionServer normally holds these, together with RpcServer and zk connection, heartbeats,
and all other stuff that is required for running as a deamon and inside a cluster. 
> See parent jira for some more context. 



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