错误信息描述: HDFS error: could only be replicated to 0 nodes, instead of 1;以及由此衍生出来的种种奇葩问题(具体的错误信息见后面),下面记录一下解决方案: 首先:停止服务,也就是执行./stop-all.sh 第二步:删除dfs/name and dfs/data directories,这个具体在哪儿呢,其实就是你存放HDFS数据的文件目录那边.可以参看conf/core-site.xml文件里面的hadoop.tmp.dir.…

HDFS的Java访问接口 1)org.apache.hadoop.fs.FileSystem 是一个通用的文件系统API,提供了不同文件系统的统一访问方式. 2)org.apache.hadoop.fs.Path 是Hadoop文件系统中统一的文件或目录描述,类似于java.io.File对本地文件系统的文件或目录描述. 3)org.apache.hadoop.conf.Configuration 读取.解析配置文件(如core-site.xml/hdfs-default.xml/hdfs-s…

需求是,上传文件到HDFS,然后生成同名的MD5文件,基本示例如下: public static String getMD5(InputStream inputStream) { byte[] buffer = new byte[1024]; int len = 0; try { MessageDigest messageDigest = MessageDigest.getInstance("MD5"); while ((len = inputStream.read(buffer))…

15/03/18 09:59:21 INFO mapreduce.Job: Task Id : attempt_1426641074924_0002_m_000000_2, Status : FAILED Error: org.apache.hadoop.hdfs.BlockMissingException: Could not obtain block: BP-35642051-192.168.199.91-1419581604721:blk_1073743091_2267 file=/fil…

14/04/11 17:59:44 ERROR hdfs.DFSClient: Failed to close file /wlan_out/_temporary/_attempt_local_0001_r_000000_0/part-r-00000org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease on /wlan_out/_t…

Found lingering reference异常 ERROR: Found lingering reference file hdfs://jiujiang1:9000/hbase/month_hotstatic/5af24d51488823419d155283441c2d0f/c/9b58bc5e853f445e9f28b98a36da6d04.b330aa24d0e3652ae89e6674fc2b3689 官方解决: 第一种解决:hbase hbck -fixReferenceFil…

前期博客 Flume自定义拦截器(Interceptors)或自带拦截器时的一些经验技巧总结(图文详解)   问题详情 -- ::, (SinkRunner-PollingRunner-DefaultSinkProcessor) [WARN - org.apache.flume.sink.hdfs.BucketWriter.append(BucketWriter.java:)] Block Under-replication detected. Rotating file. -- ::, (Si…

用三台centos操作系统的机器搭建了一个hadoop的分布式集群.启动服务后失败,查看datanode的日志,提示错误:ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible namespaceIDs in /var/lib/hadoop-0.20/cache/hdfs/dfs/data: namenode namespaceID = 240012870; datanode…

报错背景: CDH集成了Flume服务,准备通过Flume将kafka中的数据放到HDFS中, 启动Flume的时候报错. 报错现象: // :: INFO hdfs.HDFSDataStream: Serializer = TEXT, UseRawLocalFileSystem = false // :: INFO hdfs.BucketWriter: Creating hdfs://master:8020/yk/dl/alarm_his/AlarmHis.1557281724769.txt.…

错误如下所示; [root@localhost sbin]# start-all.sh Starting namenodes on [192.168.71.129] ERROR: Attempting to operate on hdfs namenode as root ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation. Starting datanodes ERROR: Attempting to op…