[CONNECTORS-1116] "Too many open files" IO exception from Rest API

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: ManifoldCF 1.7.2
• Fix Version/s: ManifoldCF 1.8, ManifoldCF 2.0
• Component/s: API

Environment

Ubuntu Linux, Tomcat, Zookeeper

• Assignee: Karl Wright
• Reporter: Adrian Conlon
• Created: 26/Nov/14 13:00
• Updated: 28/Nov/14 17:03
• Resolved: 28/Nov/14 01:48

Description

Using the REST API to get a list of all the job definitions.

Using lsof, I can see that the total number of open files jumps from around 160 to 4500 as the call is made.

Also, I should note that there are around 4000 jobs under MCF control.

Exception below:

ERROR 2014-11-26 12:46:07,042 (http-bio-8080-exec-9) - Zookeeper initialization error: Couldn't instantiate org.apache.zookeeper.ClientCnxnSocketNIO
org.apache.manifoldcf.core.interfaces.ManifoldCFException: Zookeeper initialization error: Couldn't instantiate org.apache.zookeeper.ClientCnxnSocketNIO
at org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.createSession(ZooKeeperConnection.java:82)
at org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.<init>(ZooKeeperConnection.java:66)
at org.apache.manifoldcf.core.lockmanager.ZooKeeperConnectionPool.grab(ZooKeeperConnectionPool.java:48)
at org.apache.manifoldcf.core.lockmanager.ZooKeeperLockObject.obtainGlobalReadLock(ZooKeeperLockObject.java:190)
at org.apache.manifoldcf.core.lockmanager.LockObject.enterReadLock(LockObject.java:310)
at org.apache.manifoldcf.core.lockmanager.LockGate.enterReadLock(LockGate.java:261)
at org.apache.manifoldcf.core.lockmanager.BaseLockManager.enter(BaseLockManager.java:1522)
at org.apache.manifoldcf.core.lockmanager.BaseLockManager.enterLocks(BaseLockManager.java:803)
at org.apache.manifoldcf.core.cachemanager.CacheManager.enterCache(CacheManager.java:299)
at org.apache.manifoldcf.core.cachemanager.CacheManager.findObjectsAndExecute(CacheManager.java:100)
at org.apache.manifoldcf.crawler.jobs.Jobs.loadMultiple(Jobs.java:926)
at org.apache.manifoldcf.crawler.jobs.Jobs.getAll(Jobs.java:774)
at org.apache.manifoldcf.crawler.jobs.JobManager.getAllJobs(JobManager.java:760)
at org.apache.manifoldcf.crawler.system.ManifoldCF.apiReadJobs(ManifoldCF.java:1299)
at org.apache.manifoldcf.crawler.system.ManifoldCF.executeReadCommand(ManifoldCF.java:2919)
at org.apache.manifoldcf.apiservlet.APIServlet.executeRead(APIServlet.java:232)
at org.apache.manifoldcf.apiservlet.APIServlet.doGet(APIServlet.java:78)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Couldn't instantiate org.apache.zookeeper.ClientCnxnSocketNIO
at org.apache.zookeeper.ZooKeeper.getClientCnxnSocket(ZooKeeper.java:1778)
at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:447)
at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:380)
at org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection.createSession(ZooKeeperConnection.java:74)
... 34 more
Caused by: java.io.IOException: Too many open files
at sun.nio.ch.IOUtil.makePipe(Native Method)
at sun.nio.ch.EPollSelectorImpl.<init>(EPollSelectorImpl.java:65)
at sun.nio.ch.EPollSelectorProvider.openSelector(EPollSelectorProvider.java:36)
at java.nio.channels.Selector.open(Selector.java:227)
at org.apache.zookeeper.ClientCnxnSocketNIO.<init>(ClientCnxnSocketNIO.java:43)
at sun.reflect.GeneratedConstructorAccessor27.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at java.lang.Class.newInstance(Class.java:374)
at org.apache.zookeeper.ZooKeeper.getClientCnxnSocket(ZooKeeper.java:1775)
... 37 more