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HDFS-7980. Incremental BlockReport will dramatically slow down namenode startup. Contributed by Walter Su

This commit is contained in:
Tsz-Wo Nicholas Sze 2015-05-07 11:36:35 -07:00
parent bb035ff087
commit 4e1f2eb395
3 changed files with 115 additions and 4 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -386,6 +386,9 @@ Release 2.7.1 - UNRELEASED
HDFS-8305: HDFS INotify: the destination field of RenameOp should always
end with the file name (cmccabe)
HDFS-7980. Incremental BlockReport will dramatically slow down namenode
startup. (Walter Su via szetszwo)
Release 2.7.0 - 2015-04-20
INCOMPATIBLE CHANGES

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
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@ -1812,7 +1812,7 @@ public class BlockManager {
return !node.hasStaleStorages();
}
if (storageInfo.numBlocks() == 0) {
if (storageInfo.getBlockReportCount() == 0) {
// The first block report can be processed a lot more efficiently than
// ordinary block reports. This shortens restart times.
processFirstBlockReport(storageInfo, newReport);
@ -2066,7 +2066,7 @@ public class BlockManager {
final BlockListAsLongs report) throws IOException {
if (report == null) return;
assert (namesystem.hasWriteLock());
assert (storageInfo.numBlocks() == 0);
assert (storageInfo.getBlockReportCount() == 0);
for (BlockReportReplica iblk : report) {
ReplicaState reportedState = iblk.getState();
@ -2478,14 +2478,14 @@ public class BlockManager {
}
// just add it
storageInfo.addBlock(storedBlock);
AddBlockResult result = storageInfo.addBlock(storedBlock);
// Now check for completion of blocks and safe block count
int numCurrentReplica = countLiveNodes(storedBlock);
if (storedBlock.getBlockUCState() == BlockUCState.COMMITTED
&& numCurrentReplica >= minReplication) {
completeBlock(storedBlock.getBlockCollection(), storedBlock, false);
} else if (storedBlock.isComplete()) {
} else if (storedBlock.isComplete() && result == AddBlockResult.ADDED) {
// check whether safe replication is reached for the block
// only complete blocks are counted towards that.
// In the case that the block just became complete above, completeBlock()

108
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java
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@ -47,10 +47,14 @@ import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor.BlockTargetPair;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.hdfs.server.datanode.FinalizedReplica;
import org.apache.hadoop.hdfs.server.datanode.ReplicaBeingWritten;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
import org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo;
import org.apache.hadoop.hdfs.server.protocol.StorageReceivedDeletedBlocks;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.hadoop.net.NetworkTopology;
import org.junit.Assert;
@ -646,6 +650,110 @@ public class TestBlockManager {
BlockListAsLongs.EMPTY, null, false);
assertEquals(1, ds.getBlockReportCount());
}
/**
* test when NN starts and in same mode, it receives an incremental blockReport
* firstly. Then receives first full block report.
*/
@Test
public void testSafeModeIBRBeforeFirstFullBR() throws Exception {
// pretend to be in safemode
doReturn(true).when(fsn).isInStartupSafeMode();
DatanodeDescriptor node = nodes.get(0);
DatanodeStorageInfo ds = node.getStorageInfos()[0];
node.isAlive = true;
DatanodeRegistration nodeReg = new DatanodeRegistration(node, null, null, "");
// register new node
bm.getDatanodeManager().registerDatanode(nodeReg);
bm.getDatanodeManager().addDatanode(node);
assertEquals(node, bm.getDatanodeManager().getDatanode(node));
assertEquals(0, ds.getBlockReportCount());
// Build a incremental report
List<ReceivedDeletedBlockInfo> rdbiList = new ArrayList<>();
// Build a full report
BlockListAsLongs.Builder builder = BlockListAsLongs.builder();
// blk_42 is finalized.
long receivedBlockId = 42; // arbitrary
BlockInfoContiguous receivedBlock = addBlockToBM(receivedBlockId);
rdbiList.add(new ReceivedDeletedBlockInfo(new Block(receivedBlock),
ReceivedDeletedBlockInfo.BlockStatus.RECEIVED_BLOCK, null));
builder.add(new FinalizedReplica(receivedBlock, null, null));
// blk_43 is under construction.
long receivingBlockId = 43;
BlockInfoContiguous receivingBlock = addUcBlockToBM(receivingBlockId);
rdbiList.add(new ReceivedDeletedBlockInfo(new Block(receivingBlock),
ReceivedDeletedBlockInfo.BlockStatus.RECEIVING_BLOCK, null));
builder.add(new ReplicaBeingWritten(receivingBlock, null, null, null));
// blk_44 has 2 records in IBR. It's finalized. So full BR has 1 record.
long receivingReceivedBlockId = 44;
BlockInfoContiguous receivingReceivedBlock = addBlockToBM(receivingReceivedBlockId);
rdbiList.add(new ReceivedDeletedBlockInfo(new Block(receivingReceivedBlock),
ReceivedDeletedBlockInfo.BlockStatus.RECEIVING_BLOCK, null));
rdbiList.add(new ReceivedDeletedBlockInfo(new Block(receivingReceivedBlock),
ReceivedDeletedBlockInfo.BlockStatus.RECEIVED_BLOCK, null));
builder.add(new FinalizedReplica(receivingReceivedBlock, null, null));
// blk_45 is not in full BR, because it's deleted.
long ReceivedDeletedBlockId = 45;
rdbiList.add(new ReceivedDeletedBlockInfo(
new Block(ReceivedDeletedBlockId),
ReceivedDeletedBlockInfo.BlockStatus.RECEIVED_BLOCK, null));
rdbiList.add(new ReceivedDeletedBlockInfo(
new Block(ReceivedDeletedBlockId),
ReceivedDeletedBlockInfo.BlockStatus.DELETED_BLOCK, null));
// blk_46 exists in DN for a long time, so it's in full BR, but not in IBR.
long existedBlockId = 46;
BlockInfoContiguous existedBlock = addBlockToBM(existedBlockId);
builder.add(new FinalizedReplica(existedBlock, null, null));
// process IBR and full BR
StorageReceivedDeletedBlocks srdb =
new StorageReceivedDeletedBlocks(new DatanodeStorage(ds.getStorageID()),
rdbiList.toArray(new ReceivedDeletedBlockInfo[rdbiList.size()]));
bm.processIncrementalBlockReport(node, srdb);
// Make sure it's the first full report
assertEquals(0, ds.getBlockReportCount());
bm.processReport(node, new DatanodeStorage(ds.getStorageID()),
builder.build(), null, false);
assertEquals(1, ds.getBlockReportCount());
// verify the storage info is correct
assertTrue(bm.getStoredBlock(new Block(receivedBlockId)).findStorageInfo
(ds) >= 0);
assertTrue(((BlockInfoContiguousUnderConstruction) bm.
getStoredBlock(new Block(receivingBlockId))).getNumExpectedLocations() > 0);
assertTrue(bm.getStoredBlock(new Block(receivingReceivedBlockId))
.findStorageInfo(ds) >= 0);
assertNull(bm.getStoredBlock(new Block(ReceivedDeletedBlockId)));
assertTrue(bm.getStoredBlock(new Block(existedBlock)).findStorageInfo
(ds) >= 0);
}
private BlockInfoContiguous addBlockToBM(long blkId) {
Block block = new Block(blkId);
BlockInfoContiguous blockInfo =
new BlockInfoContiguous(block, (short) 3);
BlockCollection bc = Mockito.mock(BlockCollection.class);
Mockito.doReturn((short) 3).when(bc).getBlockReplication();
bm.blocksMap.addBlockCollection(blockInfo, bc);
return blockInfo;
}
private BlockInfoContiguous addUcBlockToBM(long blkId) {
Block block = new Block(blkId);
BlockInfoContiguousUnderConstruction blockInfo =
new BlockInfoContiguousUnderConstruction(block, (short) 3);
BlockCollection bc = Mockito.mock(BlockCollection.class);
Mockito.doReturn((short) 3).when(bc).getBlockReplication();
bm.blocksMap.addBlockCollection(blockInfo, bc);
return blockInfo;
}
/**
* Tests that a namenode doesn't choose a datanode with full disks to