ndimiduk commented on a change in pull request #1786: URL: https://github.com/apache/hbase/pull/1786#discussion_r432171658
########## File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java ########## @@ -1911,43 +1912,51 @@ public boolean normalizeRegions() throws IOException { return false; } - synchronized (this.normalizer) { + if (!normalizationInProgressLock.tryLock()) { // Don't run the normalizer concurrently + LOG.info("Normalization already in progress. Skipping request."); + } else { + try { + List<TableName> allEnabledTables = new ArrayList<>( + tableStateManager.getTablesInStates(TableState.State.ENABLED)); + Collections.shuffle(allEnabledTables); - List<TableName> allEnabledTables = new ArrayList<>( - this.tableStateManager.getTablesInStates(TableState.State.ENABLED)); - - Collections.shuffle(allEnabledTables); - - for (TableName table : allEnabledTables) { - TableDescriptor tblDesc = getTableDescriptors().get(table); - if (table.isSystemTable() || (tblDesc != null && - !tblDesc.isNormalizationEnabled())) { - LOG.trace("Skipping normalization for {}, as it's either system" - + " table or doesn't have auto normalization turned on", table); - continue; - } + for (TableName table : allEnabledTables) { + if (table.isSystemTable()) { + continue; + } + final TableDescriptor tblDesc = getTableDescriptors().get(table); + if (tblDesc != null && !tblDesc.isNormalizationEnabled()) { + LOG.debug( + "Skipping {} because normalization is disabled in its table properties.", table); + continue; + } - // make one last check that the cluster isn't shutting down before proceeding. - if (skipRegionManagementAction("region normalizer")) { - return false; - } + // make one last check that the cluster isn't shutting down before proceeding. + if (skipRegionManagementAction("region normalizer")) { + return false; + } - final List<NormalizationPlan> plans = this.normalizer.computePlanForTable(table); - if (CollectionUtils.isEmpty(plans)) { - return true; - } + final List<NormalizationPlan> plans = normalizer.computePlansForTable(table); + if (CollectionUtils.isEmpty(plans)) { + return true; + } - try (final Admin admin = asyncClusterConnection.toConnection().getAdmin()) { - for (NormalizationPlan plan : plans) { - plan.execute(admin); - if (plan.getType() == PlanType.SPLIT) { - splitPlanCount++; - } else if (plan.getType() == PlanType.MERGE) { - mergePlanCount++; + try (final Admin admin = asyncClusterConnection.toConnection().getAdmin()) { + // as of this writing, `plan.execute()` is non-blocking, so there's no artificial rate- + // limiting of merge requests due to this serial loop. Review comment: https://issues.apache.org/jira/browse/HBASE-24463 ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org