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HDDS-1981: Datanode should sync db when container is moved to CLOSED or QUASI_CLOSED state (#1319)

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Lokesh Jain 2019-08-27 10:22:03 +05:30 committed by GitHub
parent 567091aa9b
commit 4379370fb1
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6 changed files with 59 additions and 4 deletions
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6
hadoop-hdds/common/src/main/java/org/apache/hadoop/utils/LevelDBStore.java
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@ -240,6 +240,12 @@ public void compactDB() throws IOException {
}
}
@Override
public void flushDB(boolean sync) {
// TODO: Implement flush for level db
// do nothing
}
@Override
public void writeBatch(BatchOperation operation) throws IOException {
List<BatchOperation.SingleOperation> operations =

6
hadoop-hdds/common/src/main/java/org/apache/hadoop/utils/MetadataStore.java
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@ -131,6 +131,12 @@ List<Map.Entry<byte[], byte[]>> getSequentialRangeKVs(byte[] startKey,
*/
void compactDB() throws IOException;
/**
* Flush the outstanding I/O operations of the DB.
* @param sync if true will sync the outstanding I/Os to the disk.
*/
void flushDB(boolean sync) throws IOException;
/**
* Destroy the content of the specified database,
* a destroyed database will not be able to load again.

13
hadoop-hdds/common/src/main/java/org/apache/hadoop/utils/RocksDBStore.java
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@ -279,6 +279,19 @@ public void compactDB() throws IOException {
}
}
@Override
public void flushDB(boolean sync) throws IOException {
if (db != null) {
try {
// for RocksDB it is sufficient to flush the WAL as entire db can
// be reconstructed using it.
db.flushWal(sync);
} catch (RocksDBException e) {
throw toIOException("Failed to flush db", e);
}
}
}
private void deleteQuietly(File fileOrDir) {
if (fileOrDir != null && fileOrDir.exists()) {
try {

1
hadoop-hdds/common/src/main/proto/DatanodeContainerProtocol.proto
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@ -144,6 +144,7 @@ enum Result {
CONTAINER_NOT_OPEN = 39;
CONTAINER_MISSING = 40;
BLOCK_TOKEN_VERIFICATION_FAILED = 41;
ERROR_IN_DB_SYNC = 42;
}
/**

34
hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/KeyValueContainer.java
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@ -68,6 +68,8 @@
.Result.DISK_OUT_OF_SPACE;
import static org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
.Result.ERROR_IN_COMPACT_DB;
import static org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
.Result.ERROR_IN_DB_SYNC;
import static org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
.Result.INVALID_CONTAINER_STATE;
import static org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
@ -298,8 +300,14 @@ public void markContainerUnhealthy() throws StorageContainerException {
@Override
public void quasiClose() throws StorageContainerException {
// The DB must be synced during close operation
flushAndSyncDB();
writeLock();
try {
// Second sync should be a very light operation as sync has already
// been done outside the lock.
flushAndSyncDB();
updateContainerData(containerData::quasiCloseContainer);
} finally {
writeUnlock();
@ -308,16 +316,18 @@ public void quasiClose() throws StorageContainerException {
@Override
public void close() throws StorageContainerException {
// The DB must be synced during close operation
flushAndSyncDB();
writeLock();
try {
// Second sync should be a very light operation as sync has already
// been done outside the lock.
flushAndSyncDB();
updateContainerData(containerData::closeContainer);
} finally {
writeUnlock();
}
// It is ok if this operation takes a bit of time.
// Close container is not expected to be instantaneous.
compactDB();
}
/**
@ -365,6 +375,22 @@ void compactDB() throws StorageContainerException {
}
}
private void flushAndSyncDB() throws StorageContainerException {
try {
try (ReferenceCountedDB db = BlockUtils.getDB(containerData, config)) {
db.getStore().flushDB(true);
LOG.info("Container {} is synced with bcsId {}.",
containerData.getContainerID(),
containerData.getBlockCommitSequenceId());
}
} catch (StorageContainerException ex) {
throw ex;
} catch (IOException ex) {
LOG.error("Error in DB sync while closing container", ex);
throw new StorageContainerException(ex, ERROR_IN_DB_SYNC);
}
}
@Override
public KeyValueContainerData getContainerData() {
return containerData;

3
hadoop-hdds/container-service/src/test/java/org/apache/hadoop/ozone/container/keyvalue/TestKeyValueContainerMarkUnhealthy.java
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@ -155,6 +155,9 @@ public void testMarkClosedContainerAsUnhealthy() throws IOException {
*/
@Test
public void testMarkQuasiClosedContainerAsUnhealthy() throws IOException {
// We need to create the container so the sync-on-quasi-close operation
// does not NPE.
keyValueContainer.create(volumeSet, volumeChoosingPolicy, scmId);
keyValueContainer.quasiClose();
keyValueContainer.markContainerUnhealthy();
assertThat(keyValueContainerData.getState(), is(UNHEALTHY));