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https://issues.apache.org/jira/browse/CONNECTORS-1036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14137339#comment-14137339
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Karl Wright commented on CONNECTORS-1036:
-----------------------------------------
Unfortunately, this issue requires a structural change to ZooKeeperLockManager
in order to be fixed. Essentially, ZooKeeperConnection objects have to have a
sticky association with non-lock ephemeral nodes. (Lock ephemeral nodes
already have this sticky association.) That means:
-- We need to keep track of the zookeeper connection associated with each
non-lock ephemeral node
-- There needs to be a table keyed by nodepath somewhere, which points to an
object
which caches the ZookeeperConnection object
It could even be the connection object itself.
-- When working with a given path, the ZookeeperLockManager code has to be
careful to look up
the appropriate connection for the ephemeral path
-- Each ZookeeperConnection object is responsible for maintaining at most ONE
non-lock ephemeral node,
so its API methods can skip specification of the nodepath whenever writing
is taking place
It may be best to introduce a ZooKeeperEphemeralNode class that manages
connection affinity, and perhaps even a ZooKeeperEphemeralNodeManager static
class to manage the set of outstanding ZooKeeperEphemeralNode objects.
> Agents shutdown can cause Zookeeper error
> -----------------------------------------
>
> Key: CONNECTORS-1036
> URL: https://issues.apache.org/jira/browse/CONNECTORS-1036
> Project: ManifoldCF
> Issue Type: Bug
> Components: Framework core
> Affects Versions: Manifold 1.7.1, ManifoldCF 2.0
> Reporter: Karl Wright
> Assignee: Karl Wright
> Fix For: Manifold 1.7.1, ManifoldCF 2.0
>
>
> Here's the exception:
> {code}
> WARN 2014-09-17 14:06:52,228 (Shutdown thread) - Exception tossed on
> repository connector pool cleanup: KeeperErrorCode = NoNode for
> /org.apache.manifoldcf.serviceactive-_REPOSITORYCONNECTORPOOL_Web-_ANON_5
> org.apache.manifoldcf.core.interfaces.ManifoldCFException: KeeperErrorCode =
> NoNode for
> /org.apache.manifoldcf.serviceactive-_REPOSITORYCONNECTORPOOL_Web-_ANON_5
> at
> org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.handleKeeperException(ZooKeeperConnection.java:941)
> at
> org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.deleteNode(ZooKeeperConnection.java:155)
> at
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.endServiceActivity(ZooKeeperLockManager.java:478)
> at
> org.apache.manifoldcf.core.connectorpool.ConnectorPool$Pool.releaseAll(ConnectorPool.java:735)
> at
> org.apache.manifoldcf.core.connectorpool.ConnectorPool.closeAllConnectors(ConnectorPool.java:381)
> at
> org.apache.manifoldcf.crawler.repositoryconnectorpool.RepositoryConnectorPool.closeAllConnectors(RepositoryConnectorPool.java:144)
> at
> org.apache.manifoldcf.crawler.system.ManifoldCF.localCleanup(ManifoldCF.java:110)
> at
> org.apache.manifoldcf.crawler.system.CrawlerAgent.cleanUp(CrawlerAgent.java:105)
> at
> org.apache.manifoldcf.agents.system.AgentsDaemon.stopAgents(AgentsDaemon.java:171)
> at
> org.apache.manifoldcf.agents.system.AgentsDaemon$AgentsShutdownHook.doCleanup(AgentsDaemon.java:386)
> at
> org.apache.manifoldcf.core.system.ManifoldCF.cleanUpEnvironment(ManifoldCF.java:1295)
> at
> org.apache.manifoldcf.core.system.ManifoldCF$ShutdownThread.run(ManifoldCF.java:1483)
> Caused by: org.apache.zookeeper.KeeperException$NoNodeException:
> KeeperErrorCode = NoNode for
> /org.apache.manifoldcf.serviceactive-_REPOSITORYCONNECTORPOOL_Web-_ANON_5
> at
> org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
> at
> org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> at org.apache.zookeeper.ZooKeeper.delete(ZooKeeper.java:873)
> at
> org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.deleteNode(ZooKeeperConnection.java:150)
> ... 10 more
> {code}
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