bharathv commented on a change in pull request #3438:
URL: https://github.com/apache/hbase/pull/3438#discussion_r661697488
##########
File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
##########
@@ -2551,19 +2566,44 @@ private int setOfflineInZooKeeper(final RegionState
state, final ServerName dest
* know the version. So in fact we will never assign a system region to a RS
without registering on zk.
*/
public List<ServerName> getExcludedServersForSystemTable() {
+ return getExcludedServersForSystemTable(false);
+ }
+
+ /**
+ * Get a list of servers that this region can not assign to.
+ * For system table, we must assign them to a server with highest version.
+ * We can disable this exclusion using config:
+ * "hbase.min.version.move.system.tables" if checkForMinVersion is true.
+ *
+ * @param checkForMinVersion if true, check for minVersionToMoveSysTables
+ * and decide moving system table regions accordingly.
+ * @return List of Excluded servers for System table regions.
+ */
+ private List<ServerName> getExcludedServersForSystemTable(
+ boolean checkForMinVersion) {
List<Pair<ServerName, String>> serverList = new ArrayList<>();
for (ServerName s : serverManager.getOnlineServersList()) {
serverList.add(new Pair<>(s, server.getRegionServerVersion(s)));
}
if (serverList.isEmpty()) {
- return new ArrayList<>();
+ return Collections.emptyList();
}
- String highestVersion = Collections.max(serverList, new
Comparator<Pair<ServerName, String>>() {
+ String highestVersion = Collections.max(serverList,
+ new Comparator<Pair<ServerName, String>>() {
@Override
public int compare(Pair<ServerName, String> o1, Pair<ServerName, String>
o2) {
return VersionInfo.compareVersion(o1.getSecond(), o2.getSecond());
}
}).getSecond();
+ if (checkForMinVersion) {
+ if
(!DEFAULT_MIN_VERSION_MOVE_SYS_TABLES_CONFIG.equals(minVersionToMoveSysTables))
{
Review comment:
I don't have a strong opinion. If you ask me, I like the following
version but its subjective. I'm fine with whatever you think is good.
```
checkForMinVersion = checkForMinVersion &&
!DEFAULT_MIN_VERSION_MOVE_SYS_TABLES_CONFIG.equals(minVersionToMoveSysTables);
if (checkForMinVersion) {
,,,,
}
```
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