xyuanlu commented on code in PR #2106:
URL: https://github.com/apache/helix/pull/2106#discussion_r889176398
##########
helix-core/src/main/java/org/apache/helix/controller/dataproviders/BaseControllerDataProvider.java:
##########
@@ -241,21 +241,64 @@ private void refreshClusterConfig(final HelixDataAccessor
accessor,
if
(_propertyDataChangedMap.get(HelixConstants.ChangeType.CLUSTER_CONFIG).getAndSet(false))
{
_clusterConfig =
accessor.getProperty(accessor.keyBuilder().clusterConfig());
refreshedType.add(HelixConstants.ChangeType.CLUSTER_CONFIG);
+ // TODO: This is a temp function to clean up incompatible batched
disabled instances format.
+ // Remove in later version.
+ if (_clusterConfig!=null &&
needCleanUpBatchedDisabledInstance(_clusterConfig.getRecord())
+ && cleanBatchDisableMapField(accessor)) {
+ LogUtil.logInfo(logger, getClusterEventId(), String
+ .format("Clean ClusterConfig mapField for cluster %s, pipeline
%s", _clusterName,
+ getPipelineName()));
+ }
refreshAbnormalStateResolverMap(_clusterConfig);
} else {
- LogUtil.logInfo(logger, getClusterEventId(), String.format(
- "No ClusterConfig change for cluster %s, pipeline %s", _clusterName,
getPipelineName()));
+ LogUtil.logDebug(logger, getClusterEventId(), String
+ .format("No ClusterConfig change for cluster %s, pipeline %s",
_clusterName,
+ getPipelineName()));
}
}
+ // TODO: This function is used to clean up batched disabled instances for
+ // "DISABLED_INSTANCES" introduced in 1.0.3.0. This temp change should be
reverted after 1.0.5.0 \
+ // or later version.
+ private boolean cleanBatchDisableMapField(final HelixDataAccessor accessor) {
+ boolean successful =
+ accessor.updateProperty(accessor.keyBuilder().clusterConfig(), new
DataUpdater<ZNRecord>() {
+ @Override
+ public ZNRecord update(ZNRecord currentData) {
+ if (currentData == null) {
+ throw new HelixException(
+ "Cluster: " + _clusterConfig.getClusterName() + ": cluster
config is null");
+ }
+ ZNRecord newRecord = new ZNRecord(currentData);
+ String batchDisabledInstanceMapFieldKey =
+ ClusterConfig.ClusterConfigProperty.DISABLED_INSTANCES.name();
+ if (needCleanUpBatchedDisabledInstance(currentData)) {
Review Comment:
It is possible that there is a race condition that 2 pipeline both check
clusterConfig that need update. By adding another check in updater, we reduce
the race window and updater also garente that only one will write back.
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