leventov commented on a change in pull request #7154: rename maintenance mode
to decommission
URL: https://github.com/apache/incubator-druid/pull/7154#discussion_r262280836
##########
File path:
server/src/main/java/org/apache/druid/server/coordinator/helper/DruidCoordinatorBalancer.java
##########
@@ -95,37 +95,38 @@ private void balanceTier(
{
if (params.getAvailableSegments().size() == 0) {
- log.info("Metadata segments are not available. Cannot balance.");
+ log.warn("Metadata segments are not available. Cannot balance.");
return;
}
currentlyMovingSegments.computeIfAbsent(tier, t -> new
ConcurrentHashMap<>());
if (!currentlyMovingSegments.get(tier).isEmpty()) {
reduceLifetimes(tier);
- log.info("[%s]: Still waiting on %,d segments to be moved", tier,
currentlyMovingSegments.get(tier).size());
+ log.info(
+ "[%s]: Still waiting on %,d segments to be moved. Skipping balance.",
+ tier,
+ currentlyMovingSegments.get(tier).size()
+ );
return;
}
/*
- Take as much segments from maintenance servers as priority allows and
find the best location for them on
- available servers. After that, balance segments within available servers
pool.
+ Take as many segments from decommissioning servers as velocity allows
and find the best location for them on
+ active servers. After that, balance segments within active servers pool.
*/
Map<Boolean, List<ServerHolder>> partitions =
-
servers.stream().collect(Collectors.partitioningBy(ServerHolder::isInMaintenance));
- final List<ServerHolder> maintenanceServers = partitions.get(true);
- final List<ServerHolder> availableServers = partitions.get(false);
+
servers.stream().collect(Collectors.partitioningBy(ServerHolder::isDecommissioning));
+ final List<ServerHolder> decommissioningServers = partitions.get(true);
+ final List<ServerHolder> activeServers = partitions.get(false);
log.info(
- "Found %d servers in maintenance, %d available servers servers",
- maintenanceServers.size(),
- availableServers.size()
+ "Found %d active servers, %d decommissioning servers",
+ activeServers.size(),
+ decommissioningServers.size()
);
- if (maintenanceServers.isEmpty()) {
- if (availableServers.size() <= 1) {
- log.info("[%s]: %d available servers servers found. Cannot balance.",
tier, availableServers.size());
- }
- } else if (availableServers.isEmpty()) {
- log.info("[%s]: no available servers servers found during maintenance.
Cannot balance.", tier);
+ if ((decommissioningServers.isEmpty() && activeServers.size() <= 1) ||
activeServers.isEmpty()) {
+ log.warn("[%s]: insufficient active servers. Cannot balance.", tier);
+ return;
Review comment:
Is it planned that we don't emit stats in this case? If yes, a comment
should be left explicitly stating this.
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