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https://issues.apache.org/jira/browse/HBASE-19017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramkrishna.s.vasudevan updated HBASE-19017:
-------------------------------------------
Status: Patch Available (was: Open)
> EnableTableProcedure is not retaining the assignments
> -----------------------------------------------------
>
> Key: HBASE-19017
> URL: https://issues.apache.org/jira/browse/HBASE-19017
> Project: HBase
> Issue Type: Bug
> Components: Region Assignment
> Affects Versions: 2.0.0-alpha-3
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 2.0.0-beta-1
>
> Attachments: HBASE-19017.patch
>
>
> Found this while working on HBASE-18946. In branch-1.4 when ever we do enable
> table we try retain assignment.
> But in branch-2 and trunk the EnableTableProcedure tries to get the location
> from the existing regionNode. It always returns null because while doing
> region CLOSE while disabling a table, the regionNode's 'regionLocation' is
> made NULL but the 'lastHost' is actually having the servername where the
> region was hosted. But on trying assignment again we try to see what was the
> last RegionLocation and not the 'lastHost' and we go ahead with new
> assignment.
> On region CLOSE while disable table
> {code}
> public void markRegionAsClosed(final RegionStateNode regionNode) throws
> IOException {
> final RegionInfo hri = regionNode.getRegionInfo();
> synchronized (regionNode) {
> State state = regionNode.transitionState(State.CLOSED,
> RegionStates.STATES_EXPECTED_ON_CLOSE);
> regionStates.removeRegionFromServer(regionNode.getRegionLocation(),
> regionNode);
> regionNode.setLastHost(regionNode.getRegionLocation());
> regionNode.setRegionLocation(null);
> regionStateStore.updateRegionLocation(regionNode.getRegionInfo(), state,
> regionNode.getRegionLocation()/*null*/, regionNode.getLastHost(),
> HConstants.NO_SEQNUM, regionNode.getProcedure().getProcId());
> sendRegionClosedNotification(hri);
> }
> {code}
> In AssignProcedure
> {code}
> ServerName lastRegionLocation = regionNode.offline();
> {code}
> {code}
> public ServerName setRegionLocation(final ServerName serverName) {
> ServerName lastRegionLocation = this.regionLocation;
> if (LOG.isTraceEnabled() && serverName == null) {
> LOG.trace("Tracking when we are set to null " + this, new
> Throwable("TRACE"));
> }
> this.regionLocation = serverName;
> this.lastUpdate = EnvironmentEdgeManager.currentTime();
> return lastRegionLocation;
> }
> {code}
> So further code in AssignProcedure
> {code}
> boolean retain = false;
> if (!forceNewPlan) {
> if (this.targetServer != null) {
> retain = targetServer.equals(lastRegionLocation);
> regionNode.setRegionLocation(targetServer);
> } else {
> if (lastRegionLocation != null) {
> // Try and keep the location we had before we offlined.
> retain = true;
> regionNode.setRegionLocation(lastRegionLocation);
> }
> }
> }
> {code}
> Tries to do retainAssignment but fails because lastRegionLocation is always
> null.
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