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From "Yi Liang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18984) [AMv2] Retain assignment does not work well in AMv2
Date Fri, 20 Oct 2017 20:13:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16213161#comment-16213161
] 

Yi Liang commented on HBASE-18984:
----------------------------------

[~ram_krish]
I just fully check the code, I am wrong for the above comments, when do bulk region assign,
the region is transition would not be assigned. So there are no additional AssignProcedure
for region has old procedure.  And we can safely remove the step that CLOSING AND OPENING
writing into meta
See loadMeta below, which use to visit meta to create regionstatenode for all regions
{code}
private void loadMeta() throws IOException {
    // TODO: use a thread pool
    regionStateStore.visitMeta(new RegionStateStore.RegionStateVisitor() {
      @Override
      public void visitRegionState(final RegionInfo regionInfo, final State state,
          final ServerName regionLocation, final ServerName lastHost, final long openSeqNum)
{
        final RegionStateNode regionNode = regionStates.getOrCreateRegionNode(regionInfo);
        synchronized (regionNode) {
          if (!regionNode.isInTransition()) {
            regionNode.setState(state);
            regionNode.setLastHost(lastHost);
            regionNode.setRegionLocation(regionLocation);
            regionNode.setOpenSeqNum(openSeqNum);

            if (state == State.OPEN) {
              assert regionLocation != null : "found null region location for " + regionNode;
              regionStates.addRegionToServer(regionLocation, regionNode);
            } else if (state == State.OFFLINE || regionInfo.isOffline()) {
              regionStates.addToOfflineRegions(regionNode);
            } else {
              // These regions should have a procedure in replay
              regionStates.addRegionInTransition(regionNode, null);
            }
          }
        }
      }
    });

    // every assignment is blocked until meta is loaded.
    wakeMetaLoadedEvent();
  }
{code}

> [AMv2] Retain assignment does not work well in AMv2
> ---------------------------------------------------
>
>                 Key: HBASE-18984
>                 URL: https://issues.apache.org/jira/browse/HBASE-18984
>             Project: HBase
>          Issue Type: Bug
>          Components: proc-v2
>    Affects Versions: 2.0.0
>            Reporter: Yi Liang
>            Assignee: Yi Liang
>             Fix For: 2.0.0
>
>         Attachments: HBASE-18984-V1-master.patch, Screen Shot 2017-10-10 at 2.24.19 PM.png
>
>
> work on 8.17 Retain assignment in https://docs.google.com/document/d/1eVKa7FHdeoJ1-9o8yZcOTAQbv0u0bblBlCCzVSIn69g/edit#heading=h.epjn9nege80k
> To reproduce this error, in hbase shell:
> createTable t1 --> list_regions 't1' --> disable 't1' ---> enable 't1' -->
list_reigons 't1' (maybe you need to try enable/disable multiple times)
> See attached images. same region assigned to different region servers



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