KevinWikant commented on a change in pull request #3675:
URL: https://github.com/apache/hadoop/pull/3675#discussion_r762076676
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDecommission.java
##########
@@ -1654,4 +1658,139 @@ public Boolean get() {
cleanupFile(fileSys, file);
}
+
+ /**
+ * Test DatanodeAdminManager logic to re-queue unhealthy decommissioning
nodes
+ * which are blocking the decommissioning of healthy nodes.
+ * Force the tracked nodes set to be filled with nodes lost while
decommissioning,
+ * then decommission healthy nodes & validate they are decommissioned
eventually.
+ */
+ @Test(timeout = 120000)
+ public void testRequeueUnhealthyDecommissioningNodes() throws Exception {
+ // Allow 3 datanodes to be decommissioned at a time
+
getConf().setInt(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES,
3);
+ // Disable the normal monitor runs
+ getConf()
+ .setInt(MiniDFSCluster.DFS_NAMENODE_DECOMMISSION_INTERVAL_TESTING_KEY,
Integer.MAX_VALUE);
+
+ // Start cluster with 6 datanodes
+ startCluster(1, 6);
+ final FSNamesystem namesystem = getCluster().getNamesystem();
+ final BlockManager blockManager = namesystem.getBlockManager();
+ final DatanodeManager datanodeManager = blockManager.getDatanodeManager();
+ final DatanodeAdminManager decomManager =
datanodeManager.getDatanodeAdminManager();
+ assertEquals(6, getCluster().getDataNodes().size());
+
+ // 3 datanodes will be "live" datanodes that are expected to be
decommissioned eventually
+ final List<DatanodeDescriptor> liveNodes =
getCluster().getDataNodes().subList(3, 6).stream()
+ .map(dn -> getDatanodeDesriptor(namesystem, dn.getDatanodeUuid()))
+ .collect(Collectors.toList());
+ assertEquals(3, liveNodes.size());
+
+ // 3 datanodes will be "dead" datanodes that are expected to never be
decommissioned
+ final List<DatanodeDescriptor> deadNodes =
getCluster().getDataNodes().subList(0, 3).stream()
+ .map(dn -> getDatanodeDesriptor(namesystem, dn.getDatanodeUuid()))
+ .collect(Collectors.toList());
+ assertEquals(3, deadNodes.size());
+
+ // Need to create some data or "isNodeHealthyForDecommissionOrMaintenance"
+ // may unexpectedly return true for a dead node
+ writeFile(getCluster().getFileSystem(), new Path("/tmp/test1"), 1, 100);
Review comment:
should use a larger replication factor here to ensure there are
LowRendundancy blocks
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