HBASE-22378. HBase Canary fails with TableNotFoundException when table deleted during Canary run

Signed-off-by: Xu Cang <[email protected]>

Author: Caroline Zhou

hbase-server/src/main/java/org/apache/hadoop/hbase/tool/Canary.java

@@ -1246,7 +1246,7 @@ private List<Future<Void>> sniff(TaskType taskType, RegionStdOutSink regionSink)
       LOG.debug("Reading list of tables");
       List<Future<Void>> taskFutures = new LinkedList<>();
       for (TableDescriptor td: admin.listTableDescriptors()) {
-        if (admin.isTableEnabled(td.getTableName()) &&
+        if (admin.tableExists(td.getTableName()) && admin.isTableEnabled(td.getTableName()) &&
             (!td.getTableName().equals(writeTableName))) {
           LongAdder readLatency =
               regionSink.initializeAndGetReadLatencyForTable(td.getTableName().getNameAsString());