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https://issues.apache.org/jira/browse/AMBARI-17106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jonathan Hurley updated AMBARI-17106:
-------------------------------------
Status: Patch Available (was: Open)
> Deadlock While Updating Stale Configuration Cache During Upgrade
> ----------------------------------------------------------------
>
> Key: AMBARI-17106
> URL: https://issues.apache.org/jira/browse/AMBARI-17106
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 2.4.0
> Reporter: Jonathan Hurley
> Assignee: Jonathan Hurley
> Priority: Blocker
> Fix For: 2.4.0
>
> Attachments: AMBARI-17106.patch
>
>
> ambari-server --hash
> dc340e8c6cb4fa6c062f805cc1917f62299a5f50
> ambari-server-2.4.0.0-622.x86_64
> *Steps*
> # Deploy HDP-2.4.0.0 cluster with Ambari 2.4.0.0 (unsecure, non-HA cluster,
> SSL enabled)
> # Start EU to HDP-2.5.0.0-609
>
> *Result*
> While EU is in progress, found that Ambari server seems to have hung; the
> login page loads, but unable to login; The following API call hangs too --
> https://server:8443/api/v1/clusters/cl1/
> There is a deadlock when trying to update the stale configuration cache:
> {code}
> "Server Action Executor Worker 401" #225 prio=5 os_prio=0
> tid=0x00007fa07c03e800 nid=0x65df waiting on condition [0x00007fa0737ef000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000a059d4f0> (a
> java.util.concurrent.locks.ReentrantReadWriteLock$FairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock(ReentrantReadWriteLock.java:943)
> --> @TransactionalLock(lockArea = LockArea.STALE_CONFIG_CACHE, lockType =
> LockType.WRITE)
> at
> org.apache.ambari.server.orm.AmbariJpaLocalTxnInterceptor.lockTransaction(AmbariJpaLocalTxnInterceptor.java:291)
> at
> org.apache.ambari.server.orm.AmbariJpaLocalTxnInterceptor.invoke(AmbariJpaLocalTxnInterceptor.java:114)
> at
> com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:72)
> at
> com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:52)
> at
> org.apache.ambari.server.state.cluster.ClusterImpl$$EnhancerByGuice$$991b84fc.applyConfigs(<generated>)
> --> clusterGlobalLock.writeLock().lock();
> at
> org.apache.ambari.server.state.cluster.ClusterImpl.addDesiredConfig(ClusterImpl.java:2340)
> at
> org.apache.ambari.server.state.ConfigHelper.createConfigTypes(ConfigHelper.java:897)
> at
> org.apache.ambari.server.controller.internal.UpgradeResourceProvider.applyStackAndProcessConfigurations(UpgradeResourceProvider.java:1174)
> {code}
> {code}
> "ambari-hearbeat-monitor" #23 prio=5 os_prio=0 tid=0x00007fa07476c000
> nid=0x20ad waiting on condition [0x00007fa07bbfb000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000a32d44a0> (a
> java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:967)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1283)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:727)
> at
> org.apache.ambari.server.state.cluster.ClusterImpl.getDesiredStackVersion(ClusterImpl.java:1052)
> at
> org.apache.ambari.server.state.ConfigHelper.calculateIsStaleConfigs(ConfigHelper.java:1075)
> --> @TransactionalLock(lockArea = LockArea.STALE_CONFIG_CACHE, lockType =
> LockType.READ)
>
> at
> org.apache.ambari.server.state.ConfigHelper.isStaleConfigs(ConfigHelper.java:456)
> at
> org.apache.ambari.server.agent.HeartbeatMonitor.createStatusCommand(HeartbeatMonitor.java:311)
> {code}
> This is another case of an Ambari cache competing with a JPA transaction.
> Consider these steps:
> - A new configuration is created within the context of a Transaction
> - Within that same Transaction, the stale configuration cache is told to
> invalidate
> - After purging the old data, but before the Transaction is committed,
> another thread tries to read from the cache. It ends up re-populating the old
> data.
> Sometimes the code works because the Transaction is able to committ before
> the cache is re-populated by another thread. In theory, we should be locking
> around reading the cache to ensure that there isn't a transaction writing to
> it. However, this is what caused the deadlock since it interferes with our
> wonder "cluster global lock of doom".
> Instead, it's safer in this case to just invalidate the cache after the
> Transaction completes.
> - We do this invalidate on a separate thread to ensure we don't have issues
> with the cluster global lock
> - Since the cache isn't needed within the context of the invalidation call,
> it's OK to purge it asynchronously.
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