wchevreuil commented on a change in pull request #828: HBASE-23102: Improper
Usage of Map putIfAbsent
URL: https://github.com/apache/hbase/pull/828#discussion_r347087338
##########
File path:
hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServer.java
##########
@@ -575,32 +575,36 @@ public void removeServers(Set<Address> servers) throws
IOException {
Map<TableName, Map<ServerName, List<RegionInfo>>> result =
Maps.newHashMap();
RSGroupInfo rsGroupInfo = getRSGroupInfo(groupName);
Map<TableName, Map<ServerName, List<RegionInfo>>> assignments =
Maps.newHashMap();
- for(Map.Entry<RegionInfo, ServerName> entry:
+ for (Map.Entry<RegionInfo, ServerName> entry:
master.getAssignmentManager().getRegionStates().getRegionAssignments().entrySet())
{
TableName currTable = entry.getKey().getTable();
ServerName currServer = entry.getValue();
RegionInfo currRegion = entry.getKey();
if (rsGroupInfo.getTables().contains(currTable)) {
- assignments.putIfAbsent(currTable, new HashMap<>());
- assignments.get(currTable).putIfAbsent(currServer, new ArrayList<>());
- assignments.get(currTable).get(currServer).add(currRegion);
+ assignments.computeIfAbsent(currTable, key -> new HashMap<>())
+ .computeIfAbsent(currServer, key -> new ArrayList<>())
+ .add(currRegion);
}
}
Map<ServerName, List<RegionInfo>> serverMap = Maps.newHashMap();
- for(ServerName serverName:
master.getServerManager().getOnlineServers().keySet()) {
- if(rsGroupInfo.getServers().contains(serverName.getAddress())) {
+ for (ServerName serverName:
master.getServerManager().getOnlineServers().keySet()) {
Review comment:
These are more of style changes, not related to the actual jira issue. Let's
address it in a separate issue, and keep this one focused on replacing
_putIfAbsent_ by _computeIfAbsent_, where applicable.
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