Hi , My hadoop version is basic on hadoop 0.20.2 realase, patched HADOOP-4675,5745,MAPREDUCE-1070,551,1089 (support ganglia31,fairscheduler preemption,hdfs append), and patched HADOOP-6099,HDFS-278,Patches-from-Dhruba-Borthakur,HDFS-200 (support scribe).
Last Friday I found that some of my test hadoop cluster nodes's time is not in the normal state, they are some number of hours beyond the normal time. So I run the next command, and add it to the crontab job. /usr/bin/rdate -s time-b.nist.gov And then my hadoop cluster namenode crashed, after my restarting the namenode. And I don't know whether it is relationed by modifying the time. The error log: 2011-02-12 18:44:46,603 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Total number of blocks = 196 2011-02-12 18:44:46,603 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of invalid blocks = 0 2011-02-12 18:44:46,603 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of under-replicated blocks = 29 2011-02-12 18:44:46,603 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of over-replicated blocks = 41 2011-02-12 18:44:46,603 INFO org.apache.hadoop.hdfs.StateChange: STATE* Leaving safe mode after 69 secs. 2011-02-12 18:44:46,603 INFO org.apache.hadoop.hdfs.StateChange: STATE* Safe mode is OFF. 2011-02-12 18:44:46,603 INFO org.apache.hadoop.hdfs.StateChange: STATE* Network topology has 1 racks and 5 datanodes 2011-02-12 18:44:46,603 INFO org.apache.hadoop.hdfs.StateChange: STATE* UnderReplicatedBlocks has 29 blocks 2011-02-12 18:44:46,886 INFO org.apache.hadoop.hdfs.StateChange: BLOCK* ask 192.168.1.14:50010 to replicate blk_-8806907658071633346_1750 to datanode(s) 192.168.1.83:50010 2011-02-12 18:44:46,887 INFO org.apache.hadoop.hdfs.StateChange: BLOCK* ask 192.168.1.83:50010 to replicate blk_-7689075547598626554_1800 to datanode(s) 192.168.1.10:50010 2011-02-12 18:44:46,887 INFO org.apache.hadoop.hdfs.StateChange: BLOCK* ask 192.168.1.84:50010 to replicate blk_-7587424527299099175_1717 to datanode(s) 192.168.1.10:50010 2011-02-12 18:44:46,887 INFO org.apache.hadoop.hdfs.StateChange: BLOCK* ask 192.168.1.84:50010 to replicate blk_-6925943363757944243_1909 to datanode(s) 192.168.1.13:50010 2011-02-12 18:44:46,888 INFO org.apache.hadoop.hdfs.StateChange: BLOCK* ask 192.168.1.14:50010 to replicate blk_-6835423500788375545_1928 to datanode(s) 192.168.1.10:50010 2011-02-12 18:44:46,888 INFO org.apache.hadoop.hdfs.StateChange: BLOCK* ask 192.168.1.83:50010 to replicate blk_-6477488774631498652_1742 to datanode(s) 192.168.1.84:50010 2011-02-12 18:44:46,889 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: ReplicationMonitor thread received Runtime exception. java.lang.IllegalStateException: generationStamp (=1) == GenerationStamp.WILDCARD_STAMP java.lang.IllegalStateException: generationStamp (=1) == GenerationStamp.WILDCARD_STAMP at org.apache.hadoop.hdfs.protocol.Block.validateGenerationStamp(Block.java:148) at org.apache.hadoop.hdfs.protocol.Block.compareTo(Block.java:156) at org.apache.hadoop.hdfs.protocol.Block.compareTo(Block.java:30) at java.util.TreeMap.put(TreeMap.java:545) at java.util.TreeSet.add(TreeSet.java:238) at org.apache.hadoop.hdfs.server.namenode.DatanodeDescriptor.addBlocksToBeInvalidated(DatanodeDescriptor.java:284) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.invalidateWorkForOneNode(FSNamesystem.java:2743) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.computeInvalidateWork(FSNamesystem.java:2419) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.computeDatanodeWork(FSNamesystem.java:2412) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem$ReplicationMonitor.run(FSNamesystem.java:2357) at java.lang.Thread.run(Thread.java:619) 2011-02-12 18:44:46,892 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down NameNode at hadoop5/192.168.1.84 ************************************************************/ Thanks, Jameson
