[CURATOR-180] Rare occurences of NoNodeException in InterPRocessSemaphoreMurex.acquire
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Description
On some occasions, acquiring a semaphore will raise a NoNode exception (see stack below). I don't have statistics, but overs 3 weeks with about 20 test jobs/day, I observed it only twice.
If I refer to the code, the parent nodes (here /locks/-licence) should be created if it does not exist:
private InternalAcquireResult internalAcquire1Lease(ImmutableList.Builder builder, long startMs, boolean hasWait, long waitMs) throws Exception
{
// ... skipping to the problematic lines
try
{
PathAndBytesable<String> createBuilder = client.create().creatingParentsIfNeeded().withProtection().withMode(CreateMode.EPHEMERAL_SEQUENTIAL);
String path = (nodeData != null) ? createBuilder.forPath(ZKPaths.makePath(leasesPath, LEASE_BASE_NAME), nodeData) : createBuilder.forPath(ZKPaths.makePath(leasesPath, LEASE_BASE_NAME));
Here is the observed stack:
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /locks/-license/leases
at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1590)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl$3.call(GetChildrenBuilderImpl.java:214)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl$3.call(GetChildrenBuilderImpl.java:203)
at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl.pathInForeground(GetChildrenBuilderImpl.java:199)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl.forPath(GetChildrenBuilderImpl.java:191)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl.forPath(GetChildrenBuilderImpl.java:38)
at org.apache.curator.framework.recipes.locks.InterProcessSemaphoreV2.internalAcquire1Lease(InterProcessSemaphoreV2.java:358)
at org.apache.curator.framework.recipes.locks.InterProcessSemaphoreV2.acquire(InterProcessSemaphoreV2.java:281)
at org.apache.curator.framework.recipes.locks.InterProcessSemaphoreV2.acquire(InterProcessSemaphoreV2.java:206)
at org.apache.curator.framework.recipes.locks.InterProcessSemaphoreMutex.acquire(InterProcessSemaphoreMutex.java:46)
at registry.backend.zk.ZooKeeperNodesManager$ZooKeeperRegistryLock.acquire(ZooKeeperNodesManager.java:223)
... 11 more
Note that I can have several processes concurrently trying to grab the lock at the same time. It is also possible that they concurrently try to grab it while the parent path does not yet exist.
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Originally reported by VGirardReydet, imported from: Rare occurences of NoNodeException in InterPRocessSemaphoreMurex.acquire
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