/**
* Test case that reduces replication of a file with a lot of blocks and then fails over right
* after those blocks enter the DN invalidation queues on the active. Ensures that fencing is
* correct and no replicas are lost.
*/
@Test
public void testNNClearsCommandsOnFailoverWithReplChanges() throws Exception {
// Make lots of blocks to increase chances of triggering a bug.
DFSTestUtil.createFile(fs, TEST_FILE_PATH, 30 * SMALL_BLOCK, (short) 1, 1L);
banner("rolling NN1's edit log, forcing catch-up");
HATestUtil.waitForStandbyToCatchUp(nn1, nn2);
// Get some new replicas reported so that NN2 now considers
// them over-replicated and schedules some more deletions
nn1.getRpcServer().setReplication(TEST_FILE, (short) 2);
while (BlockManagerTestUtil.getComputedDatanodeWork(nn1.getNamesystem().getBlockManager())
> 0) {
LOG.info("Getting more replication work computed");
}
BlockManager bm1 = nn1.getNamesystem().getBlockManager();
while (bm1.getPendingReplicationBlocksCount() > 0) {
BlockManagerTestUtil.updateState(bm1);
cluster.triggerHeartbeats();
Thread.sleep(1000);
}
banner("triggering BRs");
cluster.triggerBlockReports();
nn1.getRpcServer().setReplication(TEST_FILE, (short) 1);
banner("computing invalidation on nn1");
BlockManagerTestUtil.computeInvalidationWork(nn1.getNamesystem().getBlockManager());
doMetasave(nn1);
banner("computing invalidation on nn2");
BlockManagerTestUtil.computeInvalidationWork(nn2.getNamesystem().getBlockManager());
doMetasave(nn2);
// Dump some info for debugging purposes.
banner("Metadata immediately before failover");
doMetasave(nn2);
// Transition nn2 to active even though nn1 still thinks it's active
banner("Failing to NN2 but let NN1 continue to think it's active");
NameNodeAdapter.abortEditLogs(nn1);
NameNodeAdapter.enterSafeMode(nn1, false);
BlockManagerTestUtil.computeInvalidationWork(nn2.getNamesystem().getBlockManager());
cluster.transitionToActive(1);
// Check that the standby picked up the replication change.
assertEquals(1, nn2.getRpcServer().getFileInfo(TEST_FILE).getReplication());
// Dump some info for debugging purposes.
banner("Metadata immediately after failover");
doMetasave(nn2);
banner("Triggering heartbeats and block reports so that fencing is completed");
cluster.triggerHeartbeats();
cluster.triggerBlockReports();
banner("Metadata after nodes have all block-reported");
doMetasave(nn2);
// The block should no longer be postponed.
assertEquals(0, nn2.getNamesystem().getPostponedMisreplicatedBlocks());
// Wait for NN2 to enact its deletions (replication monitor has to run, etc)
BlockManagerTestUtil.computeInvalidationWork(nn2.getNamesystem().getBlockManager());
HATestUtil.waitForNNToIssueDeletions(nn2);
cluster.triggerHeartbeats();
HATestUtil.waitForDNDeletions(cluster);
cluster.triggerDeletionReports();
assertEquals(0, nn2.getNamesystem().getUnderReplicatedBlocks());
assertEquals(0, nn2.getNamesystem().getPendingReplicationBlocks());
banner("Making sure the file is still readable");
FileSystem fs2 = cluster.getFileSystem(1);
DFSTestUtil.readFile(fs2, TEST_FILE_PATH);
}
