Source:
<code>public DruidCoordinatorRuntimeParams run(DruidCoordinatorRuntimeParams params) { replicatorThrottler.updateParams( coordinator.getDynamicConfigs().getReplicationThrottleLimit(), coordinator.getDynamicConfigs().getReplicantLifetime() ); CoordinatorStats stats = new CoordinatorStats(); DruidCluster cluster = params.getDruidCluster(); if (cluster.isEmpty()) { log.warn("Uh... I have no servers. Not assigning anything..."); return params; } for (String tier : cluster.getTierNames()) { replicatorThrottler.updateReplicationState(tier); replicatorThrottler.updateTerminationState(tier); } DruidCoordinatorRuntimeParams paramsWithReplicationManager = params.buildFromExisting() .withReplicationManager(replicatorThrottler) .build(); DateTime now = new DateTime(); MetadataRuleManager databaseRuleManager = paramsWithReplicationManager.getDatabaseRuleManager(); final Map<String, Set<String>> missingRules = Maps.newHashMap(); for (DataSegment segment : paramsWithReplicationManager.getAvailableSegments()) { List<Rule> rules = databaseRuleManager.getRulesWithDefault(segment.getDataSource()); boolean foundMatchingRule = false; for (Rule rule : rules) { if (rule.appliesTo(segment, now)) { stats.accumulate(rule.run(coordinator, paramsWithReplicationManager, segment)); foundMatchingRule = true; break; } } if (!foundMatchingRule) { Set<String> missingSegments = missingRules.get(segment.getDataSource()); if (missingSegments == null) { missingSegments = Sets.newHashSet(); missingRules.put(segment.getDataSource(), missingSegments); } missingSegments.add(segment.getIdentifier()); } } if (!missingRules.isEmpty()) { log.makeAlert("Unable to find a matching rules!") <START> .addData("missingSegments", missingRules) <END> .emit(); } return paramsWithReplicationManager.buildFromExisting() .withCoordinatorStats(stats) .build(); }</code><technical_language>This is pretty dangerous alerts bigger 1MB break emitter</technical_language>

Target:
public DruidCoordinatorRuntimeParams run(DruidCoordinatorRuntimeParams params) { replicatorThrottler.updateParams( coordinator.getDynamicConfigs().getReplicationThrottleLimit(), coordinator.getDynamicConfigs().getReplicantLifetime() ); CoordinatorStats stats = new CoordinatorStats(); DruidCluster cluster = params.getDruidCluster(); if (cluster.isEmpty()) { log.warn("Uh... I have no servers. Not assigning anything..."); return params; } for (String tier : cluster.getTierNames()) { replicatorThrottler.updateReplicationState(tier); replicatorThrottler.updateTerminationState(tier); } DruidCoordinatorRuntimeParams paramsWithReplicationManager = params.buildFromExisting() .withReplicationManager(replicatorThrottler) .build(); DateTime now = new DateTime(); MetadataRuleManager databaseRuleManager = paramsWithReplicationManager.getDatabaseRuleManager(); final List<String> segmentsWithMissingRules = Lists.newArrayListWithCapacity(MAX_MISSING_RULES); int missingRules = 0; for (DataSegment segment : paramsWithReplicationManager.getAvailableSegments()) { List<Rule> rules = databaseRuleManager.getRulesWithDefault(segment.getDataSource()); boolean foundMatchingRule = false; for (Rule rule : rules) { if (rule.appliesTo(segment, now)) { stats.accumulate(rule.run(coordinator, paramsWithReplicationManager, segment)); foundMatchingRule = true; break; } } if (!foundMatchingRule) { if (segmentsWithMissingRules.size() < MAX_MISSING_RULES) { segmentsWithMissingRules.add(segment.getIdentifier()); } missingRules++; } } if (!segmentsWithMissingRules.isEmpty()) { log.makeAlert("Unable to find matching rules!") .addData("segmentsWithMissingRulesCount", missingRules) .addData("segmentsWithMissingRules", segmentsWithMissingRules) .emit(); } return paramsWithReplicationManager.buildFromExisting() .withCoordinatorStats(stats) .build(); }