ritegarg commented on code in PR #6566:
URL: https://github.com/apache/hadoop/pull/6566#discussion_r1508253750
##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java:
##########
@@ -2651,5 +2653,154 @@ public void
testNameNodeCreateSnapshotTrashRootOnStartup()
}
}
+ @Test
+ public void testSingleRackFailureDuringPipelineSetupMinReplicationPossible()
throws Exception {
+ Configuration conf = getTestConfiguration();
+ conf.setClass(
+ DFSConfigKeys.DFS_BLOCK_REPLICATOR_CLASSNAME_KEY,
+ BlockPlacementPolicyRackFaultTolerant.class,
+ BlockPlacementPolicy.class);
+ conf.setBoolean(
+ HdfsClientConfigKeys.BlockWrite.ReplaceDatanodeOnFailure.ENABLE_KEY,
+ false);
+ conf.setInt(HdfsClientConfigKeys.BlockWrite.ReplaceDatanodeOnFailure.
+ MIN_REPLICATION, 2);
+ // 3 racks & 3 nodes. 1 per rack
+ try (MiniDFSCluster cluster = new
MiniDFSCluster.Builder(conf).numDataNodes(3)
+ .racks(new String[] {"/rack1", "/rack2", "/rack3"}).build()) {
+ cluster.waitClusterUp();
+ DistributedFileSystem fs = cluster.getFileSystem();
+ // kill one DN, so only 2 racks stays with active DN
+ cluster.stopDataNode(0);
+ // create a file with replication 3, for rack fault tolerant BPP,
+ // it should allocate nodes in all 3 racks.
+ DFSTestUtil.createFile(fs, new Path("/testFile"), 1024L, (short) 3,
1024L);
+ cluster.shutdown(true);
Review Comment:
Try with resource handles that. We don't need cluster.shutdown here. See
[AutoCloseable](https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html)
and
[close](https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/MiniDFSCluster.java#L3564)
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