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YARN-5432. Lock already held by another process while LevelDB cache store creation for dag. Contributed by Li Lu. 

(cherry picked from commit 7f3c306e2e)
(cherry picked from commit 932bf79244)
This commit is contained in:
Junping Du 2016-07-28 06:35:24 -07:00
parent 960caf624d
commit 08358c8d4e
4 changed files with 15 additions and 181 deletions
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11
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
View File

@ -2073,6 +2073,17 @@
<value>10485760</value>
</property>
<property>
<name>yarn.timeline-service.entity-group-fs-store.app-cache-size</name>
<description>
Size of the reader cache for ATS v1.5 reader. This value controls how many
entity groups the ATS v1.5 server should cache. If the number of active
read entity groups is greater than the number of caches items, some reads
may return empty data. This value must be greater than 0.
</description>
<value>10</value>
</property>
<property>
<name>yarn.timeline-service.client.fd-flush-interval-secs</name>
<description>

46
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/main/java/org/apache/hadoop/yarn/server/timeline/EntityCacheItem.java
View File

@ -16,8 +16,6 @@
*/
package org.apache.hadoop.yarn.server.timeline;
import com.google.common.annotations.VisibleForTesting;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.util.Time;
import org.apache.hadoop.yarn.api.records.timeline.TimelineEntityGroupId;
@ -26,7 +24,6 @@
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Cache item for timeline server v1.5 reader cache. Each cache item has a
@ -41,8 +38,6 @@ public class EntityCacheItem {
private EntityGroupFSTimelineStore.AppLogs appLogs;
private long lastRefresh;
private Configuration config;
private int refCount = 0;
private static AtomicInteger activeStores = new AtomicInteger(0);
public EntityCacheItem(TimelineEntityGroupId gId, Configuration config) {
this.groupId = gId;
@ -75,13 +70,6 @@ public synchronized TimelineStore getStore() {
return store;
}
/**
* @return The number of currently active stores in all CacheItems.
*/
public static int getActiveStores() {
return activeStores.get();
}
/**
* Refresh this cache item if it needs refresh. This will enforce an appLogs
* rescan and then load new data. The refresh process is synchronized with
@ -107,7 +95,6 @@ public synchronized TimelineStore refreshCache(TimelineACLsManager aclManager,
}
if (!appLogs.getDetailLogs().isEmpty()) {
if (store == null) {
activeStores.getAndIncrement();
store = new LevelDBCacheTimelineStore(groupId.toString(),
"LeveldbCache." + groupId);
store.init(config);
@ -133,31 +120,6 @@ public synchronized TimelineStore refreshCache(TimelineACLsManager aclManager,
return store;
}
/**
* Increase the number of references to this cache item by 1.
*/
public synchronized void incrRefs() {
refCount++;
}
/**
* Unregister a reader. Try to release the cache if the reader to current
* cache reaches 0.
*
* @return true if the cache has been released, otherwise false
*/
public synchronized boolean tryRelease() {
refCount--;
// Only reclaim the storage if there is no reader.
if (refCount > 0) {
LOG.debug("{} references left for cached group {}, skipping the release",
refCount, groupId);
return false;
}
forceRelease();
return true;
}
/**
* Force releasing the cache item for the given group id, even though there
* may be active references.
@ -171,8 +133,6 @@ public synchronized void forceRelease() {
LOG.warn("Error closing timeline store", e);
}
store = null;
activeStores.getAndDecrement();
refCount = 0;
// reset offsets so next time logs are re-parsed
for (LogInfo log : appLogs.getDetailLogs()) {
if (log.getFilename().contains(groupId.toString())) {
@ -182,12 +142,6 @@ public synchronized void forceRelease() {
LOG.debug("Cache for group {} released. ", groupId);
}
@InterfaceAudience.Private
@VisibleForTesting
synchronized int getRefCount() {
return refCount;
}
private boolean needRefresh() {
return (Time.monotonicNow() - lastRefresh > 10000);
}

26
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/main/java/org/apache/hadoop/yarn/server/timeline/EntityGroupFSTimelineStore.java
View File

@ -176,15 +176,8 @@ protected boolean removeEldestEntry(
TimelineEntityGroupId groupId = eldest.getKey();
LOG.debug("Evicting {} due to space limitations", groupId);
EntityCacheItem cacheItem = eldest.getValue();
int activeStores = EntityCacheItem.getActiveStores();
if (activeStores > appCacheMaxSize * CACHE_ITEM_OVERFLOW_FACTOR) {
LOG.debug("Force release cache {} since {} stores are active",
groupId, activeStores);
cacheItem.forceRelease();
} else {
LOG.debug("Try release cache {}", groupId);
cacheItem.tryRelease();
}
LOG.debug("Force release cache {}.", groupId);
cacheItem.forceRelease();
if (cacheItem.getAppLogs().isDone()) {
appIdLogMap.remove(groupId.getApplicationId());
}
@ -862,7 +855,6 @@ void setFs(FileSystem incomingFs) {
@InterfaceAudience.Private
@VisibleForTesting
void setCachedLogs(TimelineEntityGroupId groupId, EntityCacheItem cacheItem) {
cacheItem.incrRefs();
cachedLogs.put(groupId, cacheItem);
}
@ -945,8 +937,6 @@ private TimelineStore getCachedStore(TimelineEntityGroupId groupId,
LOG.debug("Set applogs {} for group id {}", appLogs, groupId);
cacheItem.setAppLogs(appLogs);
this.cachedLogs.put(groupId, cacheItem);
// Add the reference by the cache
cacheItem.incrRefs();
} else {
LOG.warn("AppLogs for groupId {} is set to null!", groupId);
}
@ -956,8 +946,6 @@ private TimelineStore getCachedStore(TimelineEntityGroupId groupId,
if (cacheItem.getAppLogs() != null) {
AppLogs appLogs = cacheItem.getAppLogs();
LOG.debug("try refresh cache {} {}", groupId, appLogs.getAppId());
// Add the reference by the store
cacheItem.incrRefs();
cacheItems.add(cacheItem);
store = cacheItem.refreshCache(aclManager, metrics);
} else {
@ -966,12 +954,6 @@ private TimelineStore getCachedStore(TimelineEntityGroupId groupId,
return store;
}
protected void tryReleaseCacheItems(List<EntityCacheItem> relatedCacheItems) {
for (EntityCacheItem item : relatedCacheItems) {
item.tryRelease();
}
}
@Override
public TimelineEntities getEntities(String entityType, Long limit,
Long windowStart, Long windowEnd, String fromId, Long fromTs,
@ -991,7 +973,6 @@ public TimelineEntities getEntities(String entityType, Long limit,
returnEntities.addEntities(entities.getEntities());
}
}
tryReleaseCacheItems(relatedCacheItems);
return returnEntities;
}
@ -1008,12 +989,10 @@ public TimelineEntity getEntity(String entityId, String entityType,
TimelineEntity e =
store.getEntity(entityId, entityType, fieldsToRetrieve);
if (e != null) {
tryReleaseCacheItems(relatedCacheItems);
return e;
}
}
LOG.debug("getEntity: Found nothing");
tryReleaseCacheItems(relatedCacheItems);
return null;
}
@ -1041,7 +1020,6 @@ public TimelineEvents getEntityTimelines(String entityType,
}
}
}
tryReleaseCacheItems(relatedCacheItems);
return returnEvents;
}

113
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/test/java/org/apache/hadoop/yarn/server/timeline/TestEntityGroupFSTimelineStore.java
View File

@ -51,10 +51,6 @@
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.FutureTask;
import static org.apache.hadoop.yarn.server.timeline.EntityGroupFSTimelineStore.AppState;
import static org.junit.Assert.assertEquals;
@ -62,7 +58,6 @@
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
public class TestEntityGroupFSTimelineStore extends TimelineStoreTestUtils {
@ -92,7 +87,7 @@ public class TestEntityGroupFSTimelineStore extends TimelineStoreTestUtils {
private static Path testDoneDirPath;
private static String mainEntityLogFileName;
private EntityGroupFSTimelineStoreForTest store;
private EntityGroupFSTimelineStore store;
private TimelineEntity entityNew;
@Rule
@ -142,7 +137,7 @@ public void setup() throws Exception {
createTestFiles(appId, attemotDirPath);
}
store = new EntityGroupFSTimelineStoreForTest();
store = new EntityGroupFSTimelineStore();
if (currTestName.getMethodName().contains("Plugin")) {
config.set(YarnConfiguration.TIMELINE_SERVICE_ENTITY_GROUP_PLUGIN_CLASSES,
EntityGroupPlugInForTest.class.getName());
@ -329,8 +324,6 @@ store.new AppLogs(mainTestAppId, mainTestAppDirPath,
UserGroupInformation.getLoginUser());
assertNotNull(entity3);
assertEquals(entityNew.getStartTime(), entity3.getStartTime());
assertEquals(1, cacheItem.getRefCount());
assertEquals(1, EntityCacheItem.getActiveStores());
// Verify multiple entities read
NameValuePair primaryFilter = new NameValuePair(
EntityGroupPlugInForTest.APP_ID_FILTER_NAME, mainTestAppId.toString());
@ -346,74 +339,6 @@ store.new AppLogs(mainTestAppId, mainTestAppDirPath,
assertEquals(cacheRefreshBefore + 1L, cacheRefresh.lastStat().numSamples());
}
@Test(timeout = 90000L)
public void testMultiplePluginRead() throws Exception {
Thread mainThread = Thread.currentThread();
mainThread.setName("testMain");
// Verify precondition
assertEquals(EntityGroupPlugInForTest.class.getName(),
store.getConfig().get(
YarnConfiguration.TIMELINE_SERVICE_ENTITY_GROUP_PLUGIN_CLASSES));
// Prepare timeline store by making cache items
EntityGroupFSTimelineStore.AppLogs appLogs =
store.new AppLogs(mainTestAppId, mainTestAppDirPath,
AppState.COMPLETED);
final EntityCacheItem cacheItem = new EntityCacheItem(
EntityGroupPlugInForTest.getStandardTimelineGroupId(mainTestAppId),
config);
cacheItem.setAppLogs(appLogs);
store.setCachedLogs(
EntityGroupPlugInForTest.getStandardTimelineGroupId(mainTestAppId),
cacheItem);
// Launch the blocking read call in a future
ExecutorService threadExecutor = Executors.newSingleThreadExecutor();
FutureTask<TimelineEntity> blockingReader =
new FutureTask<>(new Callable<TimelineEntity>() {
public TimelineEntity call() throws Exception {
Thread currThread = Thread.currentThread();
currThread.setName("blockingReader");
return store.getEntityBlocking(mainTestAppId.toString(), "type_3",
EnumSet.allOf(TimelineReader.Field.class));
}});
threadExecutor.execute(blockingReader);
try {
while (!store.testCacheReferenced) {
Thread.sleep(300);
}
} catch (InterruptedException e) {
fail("Interrupted on exception " + e);
}
// Try refill the cache after the first cache item is referenced
for (ApplicationId appId : sampleAppIds) {
// Skip the first appId since it's already in cache
if (appId.equals(mainTestAppId)) {
continue;
}
EntityGroupFSTimelineStore.AppLogs currAppLog =
store.new AppLogs(appId, getTestRootPath(appId.toString()),
AppState.COMPLETED);
EntityCacheItem item = new EntityCacheItem(
EntityGroupPlugInForTest.getStandardTimelineGroupId(appId),
config);
item.setAppLogs(currAppLog);
store.setCachedLogs(
EntityGroupPlugInForTest.getStandardTimelineGroupId(appId),
item);
}
// At this time, the cache item of the blocking reader should be evicted.
assertEquals(1, cacheItem.getRefCount());
store.testCanProceed = true;
TimelineEntity entity3 = blockingReader.get();
assertNotNull(entity3);
assertEquals(entityNew.getStartTime(), entity3.getStartTime());
assertEquals(0, cacheItem.getRefCount());
threadExecutor.shutdownNow();
}
@Test
public void testSummaryRead() throws Exception {
// Load data
@ -472,38 +397,4 @@ private static Path getTestRootPath(String pathString) {
private static String getAttemptDirName(ApplicationId appId) {
return ApplicationAttemptId.appAttemptIdStrPrefix + appId.toString() + "_1";
}
private static class EntityGroupFSTimelineStoreForTest
extends EntityGroupFSTimelineStore {
// Flags used for the concurrent testing environment
private volatile boolean testCanProceed = false;
private volatile boolean testCacheReferenced = false;
TimelineEntity getEntityBlocking(String entityId, String entityType,
EnumSet<Field> fieldsToRetrieve) throws IOException {
List<EntityCacheItem> relatedCacheItems = new ArrayList<>();
List<TimelineStore> stores = getTimelineStoresForRead(entityId,
entityType, relatedCacheItems);
testCacheReferenced = true;
try {
while (!testCanProceed) {
Thread.sleep(1000);
}
} catch (InterruptedException e) {
fail("Interrupted " + e);
}
for (TimelineStore store : stores) {
TimelineEntity e =
store.getEntity(entityId, entityType, fieldsToRetrieve);
if (e != null) {
tryReleaseCacheItems(relatedCacheItems);
return e;
}
}
tryReleaseCacheItems(relatedCacheItems);
return null;
}
}
}