我在单个节点Hadoop环境中运行了4个SOLR索引。 虚拟机空间不足，所以我在操作系统上释放了一些空间，但是在重新启动虚拟机之后，索引没有启动。
我运行SOLR的VM有64 GB的RAM
我收到solr.DirectUpdateHandler2无法实例化错误 我需要帮助，因为我的系统因为这个问题而不再工作，而且我的备份已经过时了。
这是错误：
null:org.apache.solr.common.SolrException: SolrCore 'EMAIL_DOMAINS_shard1_replica1' is not available due to init failure: Error Instantiating Update Handler, solr.DirectUpdateHandler2 failed to instantiate org.apache.solr.update.UpdateHandler
at org.apache.solr.core.CoreContainer.getCore(CoreContainer.java:752)
at org.apache.solr.servlet.SolrDispatchFilter.checkProps(SolrDispatchFilter.java:768)
at org.apache.solr.servlet.SolrDispatchFilter.getCoreByCollection(SolrDispatchFilter.java:742)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:325)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:211)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.solr.servlet.SolrHadoopAuthenticationFilter$2.doFilter(SolrHadoopAuthenticationFilter.java:394)
at org.apache.hadoop.security.authentication.server.AuthenticationFilter.doFilter(AuthenticationFilter.java:589)
at org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticationFilter.doFilter(DelegationTokenAuthenticationFilter.java:291)
at org.apache.hadoop.security.authentication.server.AuthenticationFilter.doFilter(AuthenticationFilter.java:552)
at org.apache.solr.servlet.SolrHadoopAuthenticationFilter.doFilter(SolrHadoopAuthenticationFilter.java:399)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.solr.servlet.HostnameFilter.doFilter(HostnameFilter.java:86)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:620)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.solr.common.SolrException: Error Instantiating Update Handler, solr.DirectUpdateHandler2 failed to instantiate org.apache.solr.update.UpdateHandler
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:893)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:663)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:498)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:262)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:256)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
... 1 more
Caused by: org.apache.solr.common.SolrException: Error Instantiating Update Handler, solr.DirectUpdateHandler2 failed to instantiate org.apache.solr.update.UpdateHandler
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:581)
at org.apache.solr.core.SolrCore.createUpdateHandler(SolrCore.java:637)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:855)
... 8 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:567)
... 10 more
Caused by: java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:714)
at org.apache.hadoop.hdfs.DFSOutputStream.start(DFSOutputStream.java:2359)
at org.apache.hadoop.hdfs.DFSOutputStream.newStreamForAppend(DFSOutputStream.java:1934)
at org.apache.hadoop.hdfs.DFSClient.callAppend(DFSClient.java:1853)
at org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:1878)
at org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:1871)
at org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:329)
at org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:325)
at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at org.apache.hadoop.hdfs.DistributedFileSystem.append(DistributedFileSystem.java:325)
at org.apache.hadoop.fs.FileSystem.append(FileSystem.java:1172)
at org.apache.solr.update.HdfsTransactionLog.<init>(HdfsTransactionLog.java:93)
at org.apache.solr.update.HdfsUpdateLog.init(HdfsUpdateLog.java:200)
at org.apache.solr.update.UpdateHandler.<init>(UpdateHandler.java:136)
at org.apache.solr.update.UpdateHandler.<init>(UpdateHandler.java:94)
at org.apache.solr.update.DirectUpdateHandler2.<init>(DirectUpdateHandler2.java:100)
... 15 more
答案 0 :(得分：0)
在异常中写明你有内存不足（OOM）问题。
Caused by: java.lang.OutOfMemoryError: unable to create new native thread
鉴于您已经没有空间，请仔细检查您是否已经释放了足够的磁盘空间。
在此之后，即使OOM有很多原因，常见的原因是您的JVM没有足够的内存，因此请仔细检查堆大小配置（即–Xms和–Xmx ）。
如果释放更多磁盘空间并分配更多内存堆并不能解决您的问题，我建议：
ulimit –a），这意味着用户最大线程限制，最大打开进程和最大打开文件限制。另一方面，很少发生您分配了如此多的堆空间或太多资源，以至于操作系统没有足够的空间来运行您的应用程序。
总之，只是尝试在分配的资源和应用程序需求之间找到适当的平衡。