问题:重启所有服务器后,在启动hadoop集群时发现namenode(standby)始终启动不了,查看日志发现报错:ERROR org.apache.hadoop.hdfs.server.namenode.FSImage: Failed to load image from FSImageFile,详细报错信息如下:
2016-04-29 18:01:03,770 WARN org.apache.hadoop.security.ssl.FileBasedKeyStoresFactory: The property 'ssl.client.truststore.location' has not been set, no TrustStore will be loaded 2016-04-29 18:01:04,582 ERROR org.apache.hadoop.hdfs.server.namenode.FSImage: Failed to load image from FSImageFile(file=/opt/hadoop/dfs/name/current/fsimage_0000000000000001344, cpktTxId=0000000000000001344) java.io.IOException: Premature EOF from inputStream at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:194) at org.apache.hadoop.hdfs.server.namenode.FSImageFormat$LoaderDelegator.load(FSImageFormat.java:221) at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:913) at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:899) at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImageFile(FSImage.java:722) at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:660) at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:279) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:955) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:700) at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:529) at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:585) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:751) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:735) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1407) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1473) 2016-04-29 18:01:04,596 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Encountered exception loading fsimage java.io.IOException: Failed to load an FSImage file! at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:671) at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:279) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:955) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:700) at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:529) at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:585) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:751) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:735) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1407) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1473) 2016-04-29 18:01:04,602 INFO org.mortbay.log: Stopped HttpServer2$SelectChannelConnectorWithSafeStartup@lida2:50070 2016-04-29 18:01:04,607 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping NameNode metrics system... 2016-04-29 18:01:04,607 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system stopped. 2016-04-29 18:01:04,608 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system shutdown complete. 2016-04-29 18:01:04,608 FATAL org.apache.hadoop.hdfs.server.namenode.NameNode: Exception in namenode join java.io.IOException: Failed to load an FSImage file! at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:671) at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:279) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:955) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:700) at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:529) at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:585) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:751) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:735) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1407) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1473) 2016-04-29 18:01:04,609 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1 2016-04-29 18:01:04,614 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down NameNode at lida2/10.30.12.170 ************************************************************/原因:namenode(standby)load FSImage file失败!
解决办法:
1、手动copy namenode(active)所在的那台服务器上XXX/dfs/name/current/下的所有文件到namenode(standby)所在的那台服务器的对应文件夹下。(这个方法是我的解决办法)
2、重新格式化namenode(active),然后再把格式化后的元数据复制到namenode(standby)。(这个方法是别人提供的,我感觉这样不妥!因为,重新格式化namenode,namenode上的元数据会丢失,元数据丢失了,后果不堪设想!所以此方法风险太大,请谨慎使用!!)
3、有人说“有个命令执行一下就好了,这个命令的意思就是把所有元数据过滤一次,把好的留下,坏的剔除。后果就是会丢失一小部分坏的元数据。”不知是什么命令,搜也搜不到,有知道的,烦请告诉小弟一下!