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From Karl Wright <daddy...@gmail.com>
Subject Re: (Continuous) crawl performance
Date Wed, 05 Nov 2014 16:55:39 GMT
I will look into this when I have a chance.
Karl


On Wed, Nov 5, 2014 at 11:48 AM, Aeham Abushwashi <
aeham.abushwashi@exonar.com> wrote:

> Hi Karl,
>
> With the latest revisions, documents for all jobs (legacy and new) do get
> picked up and processed, which is great! This was verified on a small
> 1-node test system.
> I have since applied the fix to a much larger environment (29M docs across
> 4 MCF agents using a 3-node Zookeeper cluster) which has a bunch of
> mid-sized (100,000s docs) jobs in a Running state. The update of the
> priorityset field for ~36M jobqueue records took just over an hour. More
> problematically for me is the rate of reprioritization on startup which was
> very slow - nearly 2 hours to update ~600,000 records.
>
> A couple of SQL queries
> (JobManager#getNextNotYetProcessedRepriotizationDocuments and
> ManifoldCF#writeDocumentPriorities) come up frequently, but a VisualVM
> profile of the MCF agent shows the majority of the Agents thread's time is
> spent talking to ZK, for locking + reading some config data very frequently
> - see the snapshots below.
>
> Is it possible to avoid the per-document locking pattern seen in this case?
>
> Cheers,
> Aeham
>
> ++++++++++++++++++++++
>
> 2014-11-05 15:39:42
>
> "Agents thread" - Thread t@21
>    java.lang.Thread.State: WAITING
>     at java.lang.Object.wait(Native Method)
>     - waiting on <487ef1bb> (a org.apache.zookeeper.ClientCnxn$Packet)
>     at java.lang.Object.wait(Object.java:503)
>     at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1309)
>     at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1149)
>     at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1180)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.readData(ZooKeeperConnection.java:819)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.getSharedConfiguration(ZooKeeperLockManager.java:670)
>     at
>
> org.apache.manifoldcf.core.interfaces.LockManagerFactory.getBooleanProperty(LockManagerFactory.java:110)
>     at
>
> org.apache.manifoldcf.crawler.connectors.sharedrive.SharedDriveConnector.setThreadContext(SharedDriveConnector.java:157)
>     at
>
> org.apache.manifoldcf.core.connectorpool.ConnectorPool$Pool.getConnector(ConnectorPool.java:489)
>     - locked <3f2843d4> (a
> org.apache.manifoldcf.core.connectorpool.ConnectorPool$Pool)
>     at
>
> org.apache.manifoldcf.core.connectorpool.ConnectorPool.grab(ConnectorPool.java:255)
>     at
>
> org.apache.manifoldcf.crawler.repositoryconnectorpool.RepositoryConnectorPool.grab(RepositoryConnectorPool.java:86)
>     at
>
> org.apache.manifoldcf.crawler.system.ManifoldCF.writeDocumentPriorities(ManifoldCF.java:1007)
>     at
>
> org.apache.manifoldcf.crawler.system.ManifoldCF.resetAllDocumentPriorities(ManifoldCF.java:960)
>     at
>
> org.apache.manifoldcf.crawler.system.CrawlerAgent.cleanUpAllAgentData(CrawlerAgent.java:155)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon$CleanupAgent.cleanUpAllServices(AgentsDaemon.java:356)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerServiceBeginServiceActivity(ZooKeeperLockManager.java:203)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerServiceBeginServiceActivity(ZooKeeperLockManager.java:129)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon.checkAgents(AgentsDaemon.java:270)
>     - locked <6c7d33b0> (a java.util.HashMap)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon$AgentsThread.run(AgentsDaemon.java:208)
>
>    Locked ownable synchronizers:
>     - None
>
> ++++++++++++++++++++++
>
> 2014-11-05 15:39:52
>
> "Agents thread" - Thread t@21
>    java.lang.Thread.State: WAITING
>     at java.lang.Object.wait(Native Method)
>     - waiting on <52698c72> (a org.apache.zookeeper.ClientCnxn$Packet)
>     at java.lang.Object.wait(Object.java:503)
>     at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1309)
>     at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:781)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.createSequentialChild(ZooKeeperConnection.java:1116)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.obtainReadLock(ZooKeeperConnection.java:691)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockObject.obtainGlobalReadLock(ZooKeeperLockObject.java:193)
>     at
>
> org.apache.manifoldcf.core.lockmanager.LockObject.enterReadLock(LockObject.java:310)
>     - locked <151db932> (a
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockObject)
>     at
>
> org.apache.manifoldcf.core.lockmanager.LockGate.enterReadLock(LockGate.java:261)
>     at
>
> org.apache.manifoldcf.core.lockmanager.BaseLockManager.enterRead(BaseLockManager.java:1283)
>     at
>
> org.apache.manifoldcf.core.lockmanager.BaseLockManager.enterReadLock(BaseLockManager.java:790)
>     at
>
> org.apache.manifoldcf.crawler.reprioritizationtracker.ReprioritizationTracker.getMinimumDepth(ReprioritizationTracker.java:251)
>     at
>
> org.apache.manifoldcf.crawler.system.PriorityCalculator.<init>(PriorityCalculator.java:89)
>     at
>
> org.apache.manifoldcf.crawler.system.ManifoldCF.writeDocumentPriorities(ManifoldCF.java:1021)
>     at
>
> org.apache.manifoldcf.crawler.system.ManifoldCF.resetAllDocumentPriorities(ManifoldCF.java:960)
>     at
>
> org.apache.manifoldcf.crawler.system.CrawlerAgent.cleanUpAllAgentData(CrawlerAgent.java:155)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon$CleanupAgent.cleanUpAllServices(AgentsDaemon.java:356)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerServiceBeginServiceActivity(ZooKeeperLockManager.java:203)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerServiceBeginServiceActivity(ZooKeeperLockManager.java:129)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon.checkAgents(AgentsDaemon.java:270)
>     - locked <6c7d33b0> (a java.util.HashMap)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon$AgentsThread.run(AgentsDaemon.java:208)
>
>    Locked ownable synchronizers:
>     - None
>
> ++++++++++++++++++++++
>
> 2014-11-05 15:39:59
>
> "Agents thread" - Thread t@21
>    java.lang.Thread.State: WAITING
>     at java.lang.Object.wait(Native Method)
>     - waiting on <79c64d6d> (a org.apache.zookeeper.ClientCnxn$Packet)
>     at java.lang.Object.wait(Object.java:503)
>     at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1309)
>     at org.apache.zookeeper.ZooKeeper.delete(ZooKeeper.java:871)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.releaseLock(ZooKeeperConnection.java:796)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockObject.clearLock(ZooKeeperLockObject.java:218)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockObject.clearGlobalReadLockNoWait(ZooKeeperLockObject.java:212)
>     at
>
> org.apache.manifoldcf.core.lockmanager.LockObject.clearGlobalReadLock(LockObject.java:395)
>     at
>
> org.apache.manifoldcf.core.lockmanager.LockObject.leaveReadLock(LockObject.java:376)
>     - locked <126e1776> (a
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockObject)
>     at
>
> org.apache.manifoldcf.core.lockmanager.LockGate.leaveReadLock(LockGate.java:289)
>     - locked <126e1776> (a
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockObject)
>     at
>
> org.apache.manifoldcf.core.lockmanager.BaseLockManager.leaveRead(BaseLockManager.java:1369)
>     at
>
> org.apache.manifoldcf.core.lockmanager.BaseLockManager.leaveReadLock(BaseLockManager.java:804)
>     at
>
> org.apache.manifoldcf.crawler.reprioritizationtracker.ReprioritizationTracker.getMinimumDepth(ReprioritizationTracker.java:258)
>     at
>
> org.apache.manifoldcf.crawler.system.PriorityCalculator.<init>(PriorityCalculator.java:89)
>     at
>
> org.apache.manifoldcf.crawler.system.ManifoldCF.writeDocumentPriorities(ManifoldCF.java:1021)
>     at
>
> org.apache.manifoldcf.crawler.system.ManifoldCF.resetAllDocumentPriorities(ManifoldCF.java:960)
>     at
>
> org.apache.manifoldcf.crawler.system.CrawlerAgent.cleanUpAllAgentData(CrawlerAgent.java:155)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon$CleanupAgent.cleanUpAllServices(AgentsDaemon.java:356)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerServiceBeginServiceActivity(ZooKeeperLockManager.java:203)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerServiceBeginServiceActivity(ZooKeeperLockManager.java:129)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon.checkAgents(AgentsDaemon.java:270)
>     - locked <6c7d33b0> (a java.util.HashMap)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon$AgentsThread.run(AgentsDaemon.java:208)
>
>    Locked ownable synchronizers:
>     - None
>
> ++++++++++++++++++++++
>
> 2014-11-05 15:40:11
>
> "Agents thread" - Thread t@21
>    java.lang.Thread.State: WAITING
>     at java.lang.Object.wait(Native Method)
>     - waiting on <354dbdf> (a org.apache.zookeeper.ClientCnxn$Packet)
>     at java.lang.Object.wait(Object.java:503)
>     at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1309)
>     at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1149)
>     at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1180)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.readData(ZooKeeperConnection.java:819)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.getSharedConfiguration(ZooKeeperLockManager.java:670)
>     at
>
> org.apache.manifoldcf.core.interfaces.LockManagerFactory.getBooleanProperty(LockManagerFactory.java:110)
>     at
>
> org.apache.manifoldcf.crawler.connectors.sharedrive.SharedDriveConnector.setThreadContext(SharedDriveConnector.java:157)
>     at
>
> org.apache.manifoldcf.core.connectorpool.ConnectorPool$Pool.getConnector(ConnectorPool.java:489)
>     - locked <6f2f3168> (a
> org.apache.manifoldcf.core.connectorpool.ConnectorPool$Pool)
>     at
>
> org.apache.manifoldcf.core.connectorpool.ConnectorPool.grab(ConnectorPool.java:255)
>     at
>
> org.apache.manifoldcf.crawler.repositoryconnectorpool.RepositoryConnectorPool.grab(RepositoryConnectorPool.java:86)
>     at
>
> org.apache.manifoldcf.crawler.system.ManifoldCF.writeDocumentPriorities(ManifoldCF.java:1007)
>     at
>
> org.apache.manifoldcf.crawler.system.ManifoldCF.resetAllDocumentPriorities(ManifoldCF.java:960)
>     at
>
> org.apache.manifoldcf.crawler.system.CrawlerAgent.cleanUpAllAgentData(CrawlerAgent.java:155)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon$CleanupAgent.cleanUpAllServices(AgentsDaemon.java:356)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerServiceBeginServiceActivity(ZooKeeperLockManager.java:203)
>     at
>
> org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerServiceBeginServiceActivity(ZooKeeperLockManager.java:129)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon.checkAgents(AgentsDaemon.java:270)
>     - locked <6c7d33b0> (a java.util.HashMap)
>     at
>
> org.apache.manifoldcf.agents.system.AgentsDaemon$AgentsThread.run(AgentsDaemon.java:208)
>
>    Locked ownable synchronizers:
>     - None
>

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