java - Lucene LockObtainFailedException -


i trying write lucene , following error. showing full trace. thoughts on how might fix this?

org.apache.lucene.store.lockobtainfailedexception: lock obtain timed out: com.googlecode.luceneappengine.gaelockfactory$1@153c8fb @ org.apache.lucene.store.lock.obtain(lock.java:89) @ org.apache.lucene.index.indexwriter.<init>(indexwriter.java:755) @ com.company.dogcloud.taskqueue.lucene.luceneworker.updatedogdocument(luceneworker.java:61) @ com.company.dogcloud.taskqueue.lucene.luceneworker.dopost(luceneworker.java:147) @ javax.servlet.http.httpservlet.service(httpservlet.java:637) @ javax.servlet.http.httpservlet.service(httpservlet.java:717) @ org.mortbay.jetty.servlet.servletholder.handle(servletholder.java:511) @ org.mortbay.jetty.servlet.servlethandler$cachedchain.dofilter(servlethandler.java:1166) @ com.googlecode.objectify.cache.asynccachefilter.dofilter(asynccachefilter.java:58) @ com.googlecode.objectify.objectifyfilter.dofilter(objectifyfilter.java:48) @ org.mortbay.jetty.servlet.servlethandler$cachedchain.dofilter(servlethandler.java:1157) @ com.google.apphosting.utils.servlet.parseblobuploadfilter.dofilter(parseblobuploadfilter.java:125) @ org.mortbay.jetty.servlet.servlethandler$cachedchain.dofilter(servlethandler.java:1157) @ com.google.apphosting.runtime.jetty.savesessionfilter.dofilter(savesessionfilter.java:35) @ org.mortbay.jetty.servlet.servlethandler$cachedchain.dofilter(servlethandler.java:1157) @ com.google.apphosting.utils.servlet.jdbcmysqlconnectioncleanupfilter.dofilter(jdbcmysqlconnectioncleanupfilter.java:60) @ org.mortbay.jetty.servlet.servlethandler$cachedchain.dofilter(servlethandler.java:1157) @ com.google.apphosting.utils.servlet.transactioncleanupfilter.dofilter(transactioncleanupfilter.java:43) @ org.mortbay.jetty.servlet.servlethandler$cachedchain.dofilter(servlethandler.java:1157) @ org.mortbay.jetty.servlet.servlethandler.handle(servlethandler.java:388) @ org.mortbay.jetty.security.securityhandler.handle(securityhandler.java:216) @ org.mortbay.jetty.servlet.sessionhandler.handle(sessionhandler.java:182) @ org.mortbay.jetty.handler.contexthandler.handle(contexthandler.java:765) @ org.mortbay.jetty.webapp.webappcontext.handle(webappcontext.java:418) @ com.google.apphosting.runtime.jetty.appversionhandlermap.handle(appversionhandlermap.java:254) @ org.mortbay.jetty.handler.handlerwrapper.handle(handlerwrapper.java:152) @ org.mortbay.jetty.server.handle(server.java:326) @ org.mortbay.jetty.httpconnection.handlerequest(httpconnection.java:542) @ org.mortbay.jetty.httpconnection$requesthandler.headercomplete(httpconnection.java:923) @ com.google.apphosting.runtime.jetty.rpcrequestparser.parseavailable(rpcrequestparser.java:76) @ org.mortbay.jetty.httpconnection.handle(httpconnection.java:404) @ com.google.apphosting.runtime.jetty.jettyservletengineadapter.servicerequest(jettyservletengineadapter.java:146) @ com.google.apphosting.runtime.javaruntime$requestrunnable.run(javaruntime.java:527) @ com.google.tracing.tracecontext$tracecontextrunnable.runincontext(tracecontext.java:437) @ com.google.tracing.tracecontext$tracecontextrunnable$1.run(tracecontext.java:444) @ com.google.tracing.currentcontext.runincontext(currentcontext.java:230) @ com.google.tracing.tracecontext$abstracttracecontextcallback.runininheritedcontextnounref(tracecontext.java:308) @ com.google.tracing.tracecontext$abstracttracecontextcallback.runininheritedcontext(tracecontext.java:300) @ com.google.tracing.tracecontext$tracecontextrunnable.run(tracecontext.java:441) @ com.google.apphosting.runtime.threadgrouppool$poolentry.run(threadgrouppool.java:251) @ java.lang.thread.run(thread.java:745)

for each lucene directory, can opened 1 indexwriter @ time. locking exception means either:

  1. you opening indexwriter in parallel other requests, causing contention.
  2. you have lock still present on filesystem previous run of application wasn't closed correctly (crashed?)
  3. the same index being written different application

if in first case, should make sure share indexwriter instance across different threads , manage lifecycle accordingly. or use library helps dealing lucene efficiently, hibernate search or infinispan index , query things on lucene when using (respectively) hibernate or simpler hashmap-like structure.


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