YARN-8151. Yarn RM Epoch should wrap around. Contributed by Young Chen.
This commit is contained in:
Inigo Goiri
parent
87c23ef643
commit
e6a80e476d
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@ -188,6 +188,10 @@ public class YarnConfiguration extends Configuration {
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public static final String RM_EPOCH = RM_PREFIX + "epoch";
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public static final long DEFAULT_RM_EPOCH = 0L;
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/** The epoch range before wrap around. 0 disables wrap around*/
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public static final String RM_EPOCH_RANGE = RM_EPOCH + ".range";
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public static final long DEFAULT_RM_EPOCH_RANGE = 0;
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/** The address of the applications manager interface in the RM.*/
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public static final String RM_ADDRESS =
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RM_PREFIX + "address";
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@ -676,6 +676,13 @@
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<!--value>yarn-cluster</value-->
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</property>
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<property>
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<description>The range of values above base epoch that the RM will use before
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wrapping around</description>
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<name>yarn.resourcemanager.epoch.range</name>
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<value>0</value>
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</property>
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<property>
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<description>The list of RM nodes in the cluster when HA is
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enabled. See description of yarn.resourcemanager.ha
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@ -205,12 +205,12 @@ public class FileSystemRMStateStore extends RMStateStore {
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Epoch epoch = new EpochPBImpl(EpochProto.parseFrom(data));
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currentEpoch = epoch.getEpoch();
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// increment epoch and store it
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byte[] storeData = Epoch.newInstance(currentEpoch + 1).getProto()
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byte[] storeData = Epoch.newInstance(nextEpoch(currentEpoch)).getProto()
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.toByteArray();
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updateFile(epochNodePath, storeData, false);
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} else {
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// initialize epoch file with 1 for the next time.
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byte[] storeData = Epoch.newInstance(currentEpoch + 1).getProto()
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byte[] storeData = Epoch.newInstance(nextEpoch(currentEpoch)).getProto()
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.toByteArray();
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writeFileWithRetries(epochNodePath, storeData, false);
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}
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@ -259,7 +259,7 @@ public class LeveldbRMStateStore extends RMStateStore {
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if (data != null) {
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currentEpoch = EpochProto.parseFrom(data).getEpoch();
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}
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EpochProto proto = Epoch.newInstance(currentEpoch + 1).getProto();
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EpochProto proto = Epoch.newInstance(nextEpoch(currentEpoch)).getProto();
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db.put(dbKeyBytes, proto.toByteArray());
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} catch (DBException e) {
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throw new IOException(e);
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@ -59,7 +59,7 @@ public class MemoryRMStateStore extends RMStateStore {
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@Override
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public synchronized long getAndIncrementEpoch() throws Exception {
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long currentEpoch = epoch;
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epoch = epoch + 1;
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epoch = nextEpoch(epoch);
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return currentEpoch;
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}
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@ -104,6 +104,7 @@ public abstract class RMStateStore extends AbstractService {
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protected static final String VERSION_NODE = "RMVersionNode";
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protected static final String EPOCH_NODE = "EpochNode";
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protected long baseEpoch;
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private long epochRange;
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protected ResourceManager resourceManager;
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private final ReadLock readLock;
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private final WriteLock writeLock;
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@ -732,6 +733,8 @@ public abstract class RMStateStore extends AbstractService {
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// read the base epoch value from conf
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baseEpoch = conf.getLong(YarnConfiguration.RM_EPOCH,
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YarnConfiguration.DEFAULT_RM_EPOCH);
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epochRange = conf.getLong(YarnConfiguration.RM_EPOCH_RANGE,
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YarnConfiguration.DEFAULT_RM_EPOCH_RANGE);
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initInternal(conf);
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}
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@ -818,7 +821,20 @@ public abstract class RMStateStore extends AbstractService {
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* Get the current epoch of RM and increment the value.
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*/
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public abstract long getAndIncrementEpoch() throws Exception;
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/**
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* Compute the next epoch value by incrementing by one.
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* Wraps around if the epoch range is exceeded so that
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* when federation is enabled epoch collisions can be avoided.
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*/
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protected long nextEpoch(long epoch){
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long epochVal = epoch - baseEpoch + 1;
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if (epochRange > 0) {
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epochVal %= epochRange;
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}
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return epochVal + baseEpoch;
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}
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/**
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* Blocking API
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* The derived class must recover state from the store and return a new
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@ -491,13 +491,13 @@ public class ZKRMStateStore extends RMStateStore {
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Epoch epoch = new EpochPBImpl(EpochProto.parseFrom(data));
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currentEpoch = epoch.getEpoch();
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// increment epoch and store it
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byte[] storeData = Epoch.newInstance(currentEpoch + 1).getProto()
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byte[] storeData = Epoch.newInstance(nextEpoch(currentEpoch)).getProto()
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.toByteArray();
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zkManager.safeSetData(epochNodePath, storeData, -1, zkAcl,
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fencingNodePath);
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} else {
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// initialize epoch node with 1 for the next time.
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byte[] storeData = Epoch.newInstance(currentEpoch + 1).getProto()
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byte[] storeData = Epoch.newInstance(nextEpoch(currentEpoch)).getProto()
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.toByteArray();
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zkManager.safeCreate(epochNodePath, storeData, zkAcl,
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CreateMode.PERSISTENT, zkAcl, fencingNodePath);
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@ -94,6 +94,8 @@ public class RMStateStoreTestBase {
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protected final long epoch = 10L;
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private final long epochRange = 10L;
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static class TestDispatcher implements Dispatcher, EventHandler<Event> {
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ApplicationAttemptId attemptId;
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@ -141,6 +143,10 @@ public class RMStateStoreTestBase {
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boolean attemptExists(RMAppAttempt attempt) throws Exception;
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}
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public long getEpochRange() {
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return epochRange;
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}
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void waitNotify(TestDispatcher dispatcher) {
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long startTime = System.currentTimeMillis();
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while(!dispatcher.notified) {
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@ -576,6 +582,14 @@ public class RMStateStoreTestBase {
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long thirdTimeEpoch = store.getAndIncrementEpoch();
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Assert.assertEquals(epoch + 2, thirdTimeEpoch);
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for (int i = 0; i < epochRange; ++i) {
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store.getAndIncrementEpoch();
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}
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long wrappedEpoch = store.getAndIncrementEpoch();
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// Epoch should have wrapped around and then incremented once for a total
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// of + 3
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Assert.assertEquals(epoch + 3, wrappedEpoch);
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}
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public void testAppDeletion(RMStateStoreHelper stateStoreHelper)
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@ -118,6 +118,7 @@ public class TestFSRMStateStore extends RMStateStoreTestBase {
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conf.setLong(YarnConfiguration.FS_RM_STATE_STORE_RETRY_INTERVAL_MS,
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900L);
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conf.setLong(YarnConfiguration.RM_EPOCH, epoch);
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conf.setLong(YarnConfiguration.RM_EPOCH_RANGE, getEpochRange());
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if (adminCheckEnable) {
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conf.setBoolean(
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YarnConfiguration.YARN_INTERMEDIATE_DATA_ENCRYPTION, true);
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@ -83,6 +83,7 @@ public class TestLeveldbRMStateStore extends RMStateStoreTestBase {
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@Test(timeout = 60000)
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public void testEpoch() throws Exception {
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conf.setLong(YarnConfiguration.RM_EPOCH, epoch);
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conf.setLong(YarnConfiguration.RM_EPOCH_RANGE, getEpochRange());
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LeveldbStateStoreTester tester = new LeveldbStateStoreTester();
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testEpoch(tester);
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}
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@ -210,6 +210,7 @@ public class TestZKRMStateStore extends RMStateStoreTestBase {
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curatorTestingServer.getConnectString());
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conf.set(YarnConfiguration.ZK_RM_STATE_STORE_PARENT_PATH, workingZnode);
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conf.setLong(YarnConfiguration.RM_EPOCH, epoch);
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conf.setLong(YarnConfiguration.RM_EPOCH_RANGE, getEpochRange());
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this.store = new TestZKRMStateStoreInternal(conf, workingZnode);
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return this.store;
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}
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