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排錯(cuò)日志:
解決辦法:可能是修改 機(jī)器名導(dǎo)致的,修改hosts,寫入hostname和IP,然后,try it agin!
解決辦法:
當(dāng)引入hadoop-common-2.2.0.jar包進(jìn)行二次開發(fā),比如讀寫HDFS文件時(shí),初次運(yùn)行報(bào)錯(cuò)。
java.io.IOException: No FileSystem for scheme: hdfs
at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2421)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2428)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:88)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2467)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2449)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:367)
at FileCopyToHdfs.readFromHdfs(FileCopyToHdfs.java:65)
at FileCopyToHdfs.main(FileCopyToHdfs.java:26)
這是因?yàn)樵摪履J(rèn)的core-default.xml沒有配置如下屬性:
<property>
<name>fs.hdfs.impl</name>
<value>org.apache.hadoop.hdfs.DistributedFileSystem</value>
<description>The FileSystem for hdfs: uris.</description>
< /property>
添加完后,問題解決。
建議下載hadoop-2.2.0源碼,在源碼修改core-default.xml文件后再編譯打包,再在二次開發(fā)的工程引入新的jar包。
http://www.cnblogs.com/tangtianfly/p/3491133.html
http://www.cnblogs.com/tangtianfly/p/3491133.html
http://blog.csdn.net/u013281331/article/details/17992077
上屬性指定fs.hdfs.impl的實(shí)現(xiàn)類。
解決辦法:
時(shí)間不同步
su root
ntpdate 133.100.11.8
cd /usr/local/hbase/bin/
./hbase-daemon.sh start regionserver
解決辦法:
打開hdfs-site.xml里配置的datanode和namenode對(duì)應(yīng)的目錄,分別打開current文件夾里的VERSION,可以看到clusterID項(xiàng)正如日志里記錄的一樣,確實(shí)不一致,修改datanode里VERSION文件的clusterID 與namenode里的一致,再重新啟動(dòng)dfs(執(zhí)行start-dfs.sh)再執(zhí)行jps命令可以看到datanode已正常啟動(dòng)。
出現(xiàn)該問題的原因:在第一次格式化dfs后,啟動(dòng)并使用了hadoop,后來又重新執(zhí)行了格式化命令(hdfs namenode -format),這時(shí)namenode的clusterID會(huì)重新生成,而datanode的clusterID 保持不變。
解決辦法:
1.檢查防火墻和selinux
2.hosts里不要有127.0.0.1指向機(jī)器名的解析存在,如“127.0.0.1 localhost”。
解決辦法:
是因?yàn)閔base和hadoop里都有這個(gè)jar包,選擇其一移除即可。
解決辦法:
原來是Hadoop在剛啟動(dòng)的時(shí)候,還處在安全模式造成的。
[coder@h2 hadoop-0.20.2]$ bin/hadoop dfsadmin -safemode get Safe mode is ON [coder@h2 hadoop-0.20.2]$
可等Hadoop退出安全模式后再執(zhí)行HBase命令,或者手動(dòng)退出Hadoop的安全模式
[coder@h2 hadoop-0.20.2]$ bin/hadoop dfsadmin -safemode leaveSafe mode is OFF [coder@h2 hadoop-0.20.2]$
cd /usr/local/hadoop2/bin
./hadoop dfsadmin -safemode leave
解決辦法:
<property>
<name>zookeeper.znode.parent</name>
<value>/usr/local/hbase/hbase_tmp/hbase</value>
</property>
解決辦法:
./stop-all.sh
hadoop namenode -format
rm -rf /home/hadoop/tmp/dfs
./start-all.sh
rm -rf /home/hadoop/tmp
rm -rf /home/hadoop/dfs_data
rm -rf /home/hadoop/pids
rm -rf /home/hadoop/dfs_name
cd /usr/local/hadoop2/bin/
./hadoop namenode -format
closing ipc connection to master.kaiser.com/192.168.0.60:8020: Connection refused
Call From master.kaiser.com/192.168.0.60 to master.kaiser.com:8020 failed on connection exception: java.net.ConnectException:Connection refused
log:
2014-09-03 13:50:39,029 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock on /home/hadoop/dfs_name/in_use.lock acquired by nodename 7582@master.kaiser.com
2014-09-03 13:50:39,032 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Encountered exception loading fsp_w_picpath
java.io.IOException: NameNode is not formatted.
2014-09-03 13:50:39,141 FATAL org.apache.hadoop.hdfs.server.namenode.NameNode: Exception in namenode join
java.io.IOException: NameNode is not formatted.
hadoop.hbase.MasterNotRunningException: The node /hbase is not in ZooKeeper. It should have been written by the master.Check the value configured in 'zookeeper.znode.parent'. There could be a mismatch with the one configured in the master.
2013-04-13 17:13:17,374 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode... 2013-04-13 17:13:27,377 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode... 2013-04-13 17:13:37,386 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode... 2013-04-13 17:13:47,393 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode... 2013-04-13 17:13:57,395 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode... 2013-04-13 17:14:07,409 INFO org.apache.hadoop.hbase.util.FSUtils: Waiting for dfs to exit safe mode...
執(zhí)行hbase程序orshell命令出現(xiàn)如下提示(./hbase shell):
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/local/hbase-0.92.1/lib/slf4j-log4j12-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/local/hadoop2-1.0.3/lib/slf4j-log4j12-1.4.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Problem connecting to server: tmaster.kaiser.com/192.168.0.63:9000
2014-06-18 20:34:59,622 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for block pool Block pool <registering> (Datanode Uuid unassigned) service to localhost/127.0.0.1:9000
java.io.IOException: Incompatible clusterIDs in /usr/local/hadoop/hdfs/data: namenode clusterID = CID-af6f15aa-efdd-479b-bf55-77270058e4f7; datanode clusterID = CID-736d1968-8fd1-4bc4-afef-5c72354c39ce
at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:472)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:225)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:249)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:929)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:900)
at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:274)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:220)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:815)
at java.lang.Thread.run(Thread.java:744)
從日志中可以看出,原因是因?yàn)閐atanode的clusterID 和 namenode的clusterID 不匹配。
regionserver.HRegionServer: Failed deleting my ephemeral node
java.io.IOException: No FileSystem for scheme: hdfs
hadoop:pache.hadoop.hdfs.server.blockmanagement.DatanodeManager: Unresolved datanode registration: hostname cannot be resolved
Hbase:Will not attempt to authenticate using SASL (unknown error)
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