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HDFS-16420. Avoid deleting unique data blocks when deleting redundancy striped blocks. (#3880) 

Reviewed-by: litao <tomleescut@gmail.com>
Signed-off-by: Takanobu Asanuma <tasanuma@apache.org>
This commit is contained in:
Jackson Wang 2022-01-14 21:38:11 +08:00 committed by Chao Sun
parent 8af28b7cca
commit d7cacea07b
4 changed files with 72 additions and 2 deletions
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5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
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@ -756,6 +756,11 @@ public class BlockManager implements BlockStatsMXBean {
return placementPolicies.getPolicy(CONTIGUOUS);
}
@VisibleForTesting
public BlockPlacementPolicy getStriptedBlockPlacementPolicy() {
return placementPolicies.getPolicy(STRIPED);
}
public void refreshBlockPlacementPolicy(Configuration conf) {
BlockPlacementPolicies bpp =
new BlockPlacementPolicies(conf, datanodeManager.getFSClusterStats(),

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicy.java
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@ -196,9 +196,10 @@ public abstract class BlockPlacementPolicy {
if (moreThanOne.remove(cur)) {
if (storages.size() == 1) {
final DatanodeStorageInfo remaining = storages.get(0);
moreThanOne.remove(remaining);
if (moreThanOne.remove(remaining)) {
exactlyOne.add(remaining);
}
}
} else {
exactlyOne.remove(cur);
}

6
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/BaseReplicationPolicyTest.java
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@ -50,6 +50,7 @@ abstract public class BaseReplicationPolicyTest {
protected NameNode namenode;
protected DatanodeManager dnManager;
protected BlockPlacementPolicy replicator;
private BlockPlacementPolicy striptedPolicy;
protected final String filename = "/dummyfile.txt";
protected DatanodeStorageInfo[] storages;
protected String blockPlacementPolicy;
@ -90,6 +91,7 @@ abstract public class BaseReplicationPolicyTest {
final BlockManager bm = namenode.getNamesystem().getBlockManager();
replicator = bm.getBlockPlacementPolicy();
striptedPolicy = bm.getStriptedBlockPlacementPolicy();
cluster = bm.getDatanodeManager().getNetworkTopology();
dnManager = bm.getDatanodeManager();
// construct network topology
@ -111,6 +113,10 @@ abstract public class BaseReplicationPolicyTest {
}
}
public BlockPlacementPolicy getStriptedPolicy() {
return striptedPolicy;
}
@After
public void tearDown() throws Exception {
namenode.stop();

58
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestReplicationPolicy.java
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@ -1018,6 +1018,64 @@ public class TestReplicationPolicy extends BaseReplicationPolicyTest {
assertEquals(chosen, storages[1]);
}
/**
* Test for the chooseReplicaToDelete are processed based on
* EC and STRIPED Policy.
*/
@Test
public void testStripedChooseReplicaToDelete() throws Exception {
List<DatanodeStorageInfo> replicaList = new ArrayList<>();
List<DatanodeStorageInfo> candidate = new ArrayList<>();
final Map<String, List<DatanodeStorageInfo>> rackMap
= new HashMap<String, List<DatanodeStorageInfo>>();
replicaList.add(storages[0]);
replicaList.add(storages[1]);
replicaList.add(storages[2]);
replicaList.add(storages[4]);
candidate.add(storages[0]);
candidate.add(storages[2]);
candidate.add(storages[4]);
// Refresh the last update time for all the datanodes
for (int i = 0; i < dataNodes.length; i++) {
DFSTestUtil.resetLastUpdatesWithOffset(dataNodes[i], 0);
}
List<DatanodeStorageInfo> first = new ArrayList<>();
List<DatanodeStorageInfo> second = new ArrayList<>();
BlockPlacementPolicy policy = getStriptedPolicy();
policy.splitNodesWithRack(replicaList, candidate, rackMap, first,
second);
// storages[0] is in first set as its rack has two replica nodes,
// while storages[2] and dataNodes[4] are in second set.
assertEquals(1, first.size());
assertEquals(2, second.size());
List<StorageType> excessTypes = new ArrayList<>();
excessTypes.add(StorageType.DEFAULT);
DatanodeStorageInfo chosen = ((BlockPlacementPolicyDefault) policy)
.chooseReplicaToDelete(first, second, excessTypes, rackMap);
// Within all storages, storages[0] is in the rack that has two replica blocks
assertEquals(chosen, storages[0]);
policy.adjustSetsWithChosenReplica(rackMap, first, second, chosen);
assertEquals(0, first.size());
assertEquals(2, second.size());
// Within second set, storages[2] should be next to be deleted in order.
excessTypes.add(StorageType.DEFAULT);
chosen = ((BlockPlacementPolicyDefault) policy).chooseReplicaToDelete(
first, second, excessTypes, rackMap);
assertEquals(chosen, storages[2]);
policy.adjustSetsWithChosenReplica(rackMap, first, second, chosen);
assertEquals(0, first.size());
assertEquals(1, second.size());
chosen = ((BlockPlacementPolicyDefault) policy).chooseReplicaToDelete(
first, second, excessTypes, rackMap);
assertEquals(chosen, null);
}
private long calculateRemaining(DatanodeDescriptor dataNode) {
long sum = 0;
for (DatanodeStorageInfo storageInfo: dataNode.getStorageInfos()){