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https://issues.apache.org/jira/browse/HBASE-21455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16800605#comment-16800605
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Pankaj Kumar commented on HBASE-21455:
--------------------------------------

SnapshotQuotaObserverChore should also handle this scenario,

{noformat}

// Collect either the table name itself, or all of the tables in the namespace
 if (null != ns) {
 
tablesToFetchSnapshotsFrom.addAll(Arrays.asList(admin.listTableNamesByNamespace(ns)));
 } else {
 tablesToFetchSnapshotsFrom.add(tn);
 }

{noformat}

> Update filesystem-space quota fail if there is a space quota for non-existing 
> namespace
> ---------------------------------------------------------------------------------------
>
>                 Key: HBASE-21455
>                 URL: https://issues.apache.org/jira/browse/HBASE-21455
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.2
>            Reporter: wenbang
>            Assignee: wenbang
>            Priority: Major
>         Attachments: HBASE-21455.master.001.patch
>
>
> QuotaObserverChore#fetchAllTablesWithQuotasDefined may fail and throw a 
> NamespaceNotFoundException because of namespace does not exist 
> {code:java}
> // Collect all of the tables in the namespace
>       TableName[] tablesInNS = 
> conn.getAdmin().listTableNamesByNamespace(namespace);
> {code}



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