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https://issues.apache.org/jira/browse/HBASE-16392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16025146#comment-16025146
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Ted Yu commented on HBASE-16392:
--------------------------------

For restoreFromSnapshot() :
{code}
+      if (snapshotExists(admin, snapshotName)) {
+        admin.disableTable(BackupSystemTable.getTableName(conf));
+        admin.restoreSnapshot(snapshotName);
+        admin.enableTable(BackupSystemTable.getTableName(conf));
{code}
What if one of the 3 actions above fails ?
{code}
+        // In this case we log WARN and proceed
+        LOG.error("Could not restore backup system table. Snapshot " + 
snapshotName+
{code}
Comment and actual log level are different.
{code}
+  protected static boolean snapshotExists(Admin admin, String snapshotName) 
throws IOException {
{code}
TableBackupClient.java already has snapshotExists() method.
{code}
+  private Delete createDeleteForDeleteOperation() {
{code}
createDeleteForDeleteOperation -> createDeleteForBackupDeleteOperation

> Backup delete fault tolerance
> -----------------------------
>
>                 Key: HBASE-16392
>                 URL: https://issues.apache.org/jira/browse/HBASE-16392
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>              Labels: backup
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16392-v1.patch
>
>
> Backup delete modified file system and backup system table. We have to make 
> sure that operation is atomic, durable and isolated.



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