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https://issues.apache.org/jira/browse/HBASE-21987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xiang Li updated HBASE-21987:
-----------------------------
Description:
The logic of offline mode for RSGroupInfoManagerImpl#flushConfig(Map<String,
RSGroupInfo> newGroupMap) could be simplified.
{code:RSGroupInfoManagerImpl}
if (!isOnline()) {
Map<String, RSGroupInfo> m = Maps.newHashMap(rsGroupMap);
RSGroupInfo oldDefaultGroup = m.remove(RSGroupInfo.DEFAULT_GROUP);
RSGroupInfo newDefaultGroup =
newGroupMap.remove(RSGroupInfo.DEFAULT_GROUP);
if (!m.equals(newGroupMap) ||
!oldDefaultGroup.getTables().equals(newDefaultGroup.getTables())) {
throw new IOException("Only default servers can be updated during
offline mode");
}
newGroupMap.put(RSGroupInfo.DEFAULT_GROUP, newDefaultGroup);
rsGroupMap = newGroupMap;
return;
}
{code}
The logic is to make a copy of the private member called "rsGroupMap" as m, and
get the default group out of m and newGroupMap and then compare. Then restore
the newGroupMap and update rsGroupMap.
This function sometimes is called by
{code:RSGroupInfoManagerImpl}
private synchronized void flushConfig() throws IOException {
flushConfig(this.rsGroupMap);
}
{code}
by RSGroupInfoManagerImpl.RSGroupStartupWorker#waitForGroupTableOnline() during
HMaster starts
When newGroupMap (the input of flushConfig() is this.rsGroupMap, the
comparision is not needed, as they are the same.
> Simplify RSGroupInfoManagerImpl#flushConfig() for offline mode
> --------------------------------------------------------------
>
> Key: HBASE-21987
> URL: https://issues.apache.org/jira/browse/HBASE-21987
> Project: HBase
> Issue Type: Improvement
> Components: rsgroup
> Reporter: Xiang Li
> Assignee: Xiang Li
> Priority: Minor
>
> The logic of offline mode for RSGroupInfoManagerImpl#flushConfig(Map<String,
> RSGroupInfo> newGroupMap) could be simplified.
> {code:RSGroupInfoManagerImpl}
> if (!isOnline()) {
> Map<String, RSGroupInfo> m = Maps.newHashMap(rsGroupMap);
> RSGroupInfo oldDefaultGroup = m.remove(RSGroupInfo.DEFAULT_GROUP);
> RSGroupInfo newDefaultGroup =
> newGroupMap.remove(RSGroupInfo.DEFAULT_GROUP);
> if (!m.equals(newGroupMap) ||
> !oldDefaultGroup.getTables().equals(newDefaultGroup.getTables())) {
> throw new IOException("Only default servers can be updated during
> offline mode");
> }
> newGroupMap.put(RSGroupInfo.DEFAULT_GROUP, newDefaultGroup);
> rsGroupMap = newGroupMap;
> return;
> }
> {code}
> The logic is to make a copy of the private member called "rsGroupMap" as m,
> and get the default group out of m and newGroupMap and then compare. Then
> restore the newGroupMap and update rsGroupMap.
> This function sometimes is called by
> {code:RSGroupInfoManagerImpl}
> private synchronized void flushConfig() throws IOException {
> flushConfig(this.rsGroupMap);
> }
> {code}
> by RSGroupInfoManagerImpl.RSGroupStartupWorker#waitForGroupTableOnline()
> during HMaster starts
> When newGroupMap (the input of flushConfig() is this.rsGroupMap, the
> comparision is not needed, as they are the same.
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