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hadoopd的secondarynamenode的使用 - html/css语言栏目：

来源：自学PHP网    时间：2015-04-14 14:51 作者： 阅读:次

[导读] core-site.xml:[html] !-- Put site-specific property overrides in this file. --configuration property namehadoop.tmp.dir/name value/home/hadoop/fs/tmp/value /property ......

core-site.xml:

[html] <!-- Put site-specific property overrides in this file. --> 
<configuration> 
    <property> 
        <name>hadoop.tmp.dir</name> 
        <value>/home/hadoop/fs/tmp</value> 
    </property> 
    <property> 
        <name>fs.default.name</name> 
        <value>hdfs://hadoop:9000</value> 
    </property> 
    <property> 
        <name>fs.checkpoint.period</name> 
        <value>300</value> 
    </property> 
    <property> 
        <name>fs.checkpoint.size</name> 
        <value>67108864</value> 
    </property> 
    <property> 
        <name>fs.checkpoint.dir</name> 
        <value>/home/hadoop/checkpoint/namesecodary</value> 
    </property> 
</configuration> 

<!-- Put site-specific property overrides in this file. -->
<configuration>
 <property>
  <name>hadoop.tmp.dir</name>
  <value>/home/hadoop/fs/tmp</value>
 </property>
 <property>
  <name>fs.default.name</name>
  <value>hdfs://hadoop:9000</value>
 </property>
 <property>
  <name>fs.checkpoint.period</name>
  <value>300</value>
 </property>
 <property>
  <name>fs.checkpoint.size</name>
  <value>67108864</value>
 </property>
 <property>
  <name>fs.checkpoint.dir</name>
  <value>/home/hadoop/checkpoint/namesecodary</value>
 </property>
</configuration>hdfs-site.xml:

[html] <!-- Put site-specific property overrides in this file. --> 
<configuration> 
    <property> 
        <name>dfs.replicatioin</name> 
        <value>1</value> 
    </property> 
    <property> 
        <name>dfs.data.dir</name> 
        <value>/home/hadoop/fs/data</value> 
    </property> 
    <property> 
        <name>dfs.name.dir</name> 
        <value>/home/hadoop/fs/name</value> 
    </property> 
    <property> 
        <name>dfs.back.http.address</name> 
        <value>hadoop:50070</value> 
    </property> 
    <property> 
        <name>dfs.permissions</name> 
        <value>false</value> 
    </property> 
</configuration> 

<!-- Put site-specific property overrides in this file. -->
<configuration>
 <property>
  <name>dfs.replicatioin</name>
  <value>1</value>
 </property>
 <property>
  <name>dfs.data.dir</name>
  <value>/home/hadoop/fs/data</value>
 </property>
 <property>
  <name>dfs.name.dir</name>
  <value>/home/hadoop/fs/name</value>
 </property>
 <property>
  <name>dfs.back.http.address</name>
  <value>hadoop:50070</value>
 </property>
 <property>
  <name>dfs.permissions</name>
  <value>false</value>
 </property>
</configuration>mapred-site.xml:

[html]  <!-- Put site-specific property overrides in this file. --> 
<configuration> 
    <property> 
        <name>mapred.job.tracker</name> 
        <value>hadoop:9001</value> 
    </property> 
</configuration> 

<!-- Put site-specific property overrides in this file. -->
<configuration>
 <property>
  <name>mapred.job.tracker</name>
  <value>hadoop:9001</value>
 </property>
</configuration>

1.首先输入jps，查看hadoop进程，如下：

[plain]  hadoop@hadoop:~/hadoop-1.0.4/bin$ jps 
16018 TaskTracker 
15646 DataNode 
17250 NameNode 
15870 JobTracker 
17296 Jps 
15790 SecondaryNameNode 

hadoop@hadoop:~/hadoop-1.0.4/bin$ jps
16018 TaskTracker
15646 DataNode
17250 NameNode
15870 JobTracker
17296 Jps
15790 SecondaryNameNode2.kill掉namenode的进程，继续查看hadoop进程，如下：

[plain]  hadoop@hadoop:~/hadoop-1.0.4/bin$ kill 17250 
hadoop@hadoop:~/hadoop-1.0.4/bin$ jps 
16018 TaskTracker 
15646 DataNode 
17328 Jps 
15870 JobTracker 
15790 SecondaryNameNode 

hadoop@hadoop:~/hadoop-1.0.4/bin$ kill 17250
hadoop@hadoop:~/hadoop-1.0.4/bin$ jps
16018 TaskTracker
15646 DataNode
17328 Jps
15870 JobTracker
15790 SecondaryNameNode3. 删除dfs.name.dir的目录的全部内容；

4. 这里没有按照参考的博客那样把secondarynamenode的fs.checkpoint.dir的内容拷贝到namenode的dfs.name.dir下面，而是直接使用./hadoop namenode -importCheckPoint命令，这个命令应该已经含有了拷贝的命令了，出现下面的logs信息：

[plain]  hadoop@hadoop:~/hadoop-1.0.4/bin$ ./hadoop namenode -importCheckPoint 
13/05/28 15:37:14 INFO namenode.NameNode: STARTUP_MSG:  
/************************************************************ 
STARTUP_MSG: Starting NameNode 
STARTUP_MSG:   host = hadoop/192.168.128.138 
STARTUP_MSG:   args = [-importCheckPoint] 
STARTUP_MSG:   version = 1.0.4 
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1393290; compiled by 'hortonfo' on Wed Oct  3 05:13:58 UTC 2012 
************************************************************/ 
13/05/28 15:37:14 INFO impl.MetricsConfig: loaded properties from hadoop-metrics2.properties 
13/05/28 15:37:14 INFO impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered. 
13/05/28 15:37:14 INFO impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s). 
13/05/28 15:37:14 INFO impl.MetricsSystemImpl: NameNode metrics system started 
13/05/28 15:37:14 INFO impl.MetricsSourceAdapter: MBean for source ugi registered. 
13/05/28 15:37:14 WARN impl.MetricsSystemImpl: Source name ugi already exists! 
13/05/28 15:37:14 INFO impl.MetricsSourceAdapter: MBean for source jvm registered. 
13/05/28 15:37:14 INFO impl.MetricsSourceAdapter: MBean for source NameNode registered. 
13/05/28 15:37:14 INFO util.GSet: VM type       = 32-bit 
13/05/28 15:37:14 INFO util.GSet: 2% max memory = 19.33375 MB 
13/05/28 15:37:14 INFO util.GSet: capacity      = 2^22 = 4194304 entries 
13/05/28 15:37:14 INFO util.GSet: recommended=4194304, actual=4194304 
13/05/28 15:37:14 INFO namenode.FSNamesystem: fsOwner=hadoop 
13/05/28 15:37:14 INFO namenode.FSNamesystem: supergroup=supergroup 
13/05/28 15:37:14 INFO namenode.FSNamesystem: isPermissionEnabled=false 
13/05/28 15:37:14 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100 
13/05/28 15:37:14 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s) 
13/05/28 15:37:15 INFO namenode.FSNamesystem: Registered FSNamesystemStateMBean and NameNodeMXBean 
13/05/28 15:37:15 INFO namenode.NameNode: Caching file names occuring more than 10 times  
13/05/28 15:37:15 INFO common.Storage: Storage directory /home/hadoop/fs/name is not formatted. 
13/05/28 15:37:15 INFO common.Storage: Formatting ... 
13/05/28 15:37:15 INFO common.Storage: Number of files = 8 
13/05/28 15:37:15 INFO common.Storage: Number of files under construction = 0 
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 loaded in 0 seconds. 
13/05/28 15:37:15 INFO common.Storage: Edits file /home/hadoop/checkpoint/namesecodary/current/edits of size 4 edits # 0 loaded in 0 seconds. 
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 saved in 0 seconds. 
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 saved in 0 seconds. 
13/05/28 15:37:15 INFO namenode.FSNamesystem: Number of transactions: 0 Total time for transactions(ms): 0Number of transactions batched in Syncs: 0 Number of syncs: 0 SyncTimes(ms): 0  
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 saved in 0 seconds. 
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 saved in 0 seconds. 
13/05/28 15:37:15 INFO namenode.NameCache: initialized with 0 entries 0 lookups 
13/05/28 15:37:15 INFO namenode.FSNamesystem: Finished loading FSImage in 345 msecs 
13/05/28 15:37:15 INFO hdfs.StateChange: STATE* Safe mode ON.  
The ratio of reported blocks 0.0000 has not reached the threshold 0.9990. Safe mode will be turned off automatically. 
13/05/28 15:37:15 INFO util.HostsFileReader: Refreshing hosts (include/exclude) list 
13/05/28 15:37:15 INFO impl.MetricsSourceAdapter: MBean for source FSNamesystemMetrics registered. 
13/05/28 15:37:15 INFO impl.MetricsSourceAdapter: MBean for source RpcDetailedActivityForPort9000 registered. 
13/05/28 15:37:15 INFO impl.MetricsSourceAdapter: MBean for source RpcActivityForPort9000 registered. 
13/05/28 15:37:15 INFO ipc.Server: Starting SocketReader 
13/05/28 15:37:15 INFO namenode.NameNode: Namenode up at: hadoop/192.168.128.138:9000 
13/05/28 15:37:35 INFO mortbay.log: Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog 
13/05/28 15:37:35 INFO http.HttpServer: Added global filtersafety (class=org.apache.hadoop.http.HttpServer$QuotingInputFilter) 
13/05/28 15:37:35 INFO http.HttpServer: dfs.webhdfs.enabled = false 
13/05/28 15:37:35 INFO http.HttpServer: Port returned by webServer.getConnectors()[0].getLocalPort() before open() is -1. Opening the listener on 50070 
13/05/28 15:37:35 INFO http.HttpServer: listener.getLocalPort() returned 50070 webServer.getConnectors()[0].getLocalPort() returned 50070 
13/05/28 15:37:35 INFO http.HttpServer: Jetty bound to port 50070 
13/05/28 15:37:35 INFO mortbay.log: jetty-6.1.26 
13/05/28 15:37:35 INFO mortbay.log: Started SelectChannelConnector@0.0.0.0:50070 
13/05/28 15:37:35 INFO namenode.NameNode: Web-server up at: 0.0.0.0:50070 
13/05/28 15:37:35 INFO ipc.Server: IPC Server Responder: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server listener on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 0 on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 1 on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 2 on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 3 on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 4 on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 5 on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 6 on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 7 on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 8 on 9000: starting 
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 9 on 9000: starting 
13/05/28 15:37:35 INFO hdfs.StateChange: BLOCK* NameSystem.registerDatanode: node registration from 192.168.128.138:50010 storage DS-2106362203-192.168.128.138-50010-1368229536640 
13/05/28 15:37:35 INFO net.NetworkTopology: Adding a new node: /default-rack/192.168.128.138:50010 
13/05/28 15:37:35 INFO hdfs.StateChange: STATE* Safe mode extension entered.  
The ratio of reported blocks 1.0000 has reached the threshold 0.9990. Safe mode will be turned off automatically in 29 seconds. 
13/05/28 15:37:35 INFO hdfs.StateChange: *BLOCK* NameSystem.processReport: from 192.168.128.138:50010, blocks: 1, processing time: 10 msecs 
13/05/28 15:37:56 INFO hdfs.StateChange: STATE* Safe mode ON.  
The ratio of reported blocks 1.0000 has reached the threshold 0.9990. Safe mode will be turned off automatically in 9 seconds. 
13/05/28 15:38:06 INFO namenode.FSNamesystem: Total number of blocks = 1 
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of invalid blocks = 0 
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of under-replicated blocks = 1 
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of  over-replicated blocks = 0 
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* Safe mode termination scan for invalid, over- and under-replicated blocks completed in 56 msec 
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* Leaving safe mode after 51 secs. 
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* Safe mode is OFF. 
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* Network topology has 1 racks and 1 datanodes 
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* UnderReplicatedBlocks has 1 blocks 
13/05/28 15:38:06 INFO namenode.FSNamesystem: ReplicateQueue QueueProcessingStatistics: First cycle completed 0 blocks in 1 msec 
13/05/28 15:38:06 INFO namenode.FSNamesystem: ReplicateQueue QueueProcessingStatistics: Queue flush completed 0 blocks in 1 msec processing time, 1 msec clock time, 1 cycles 
13/05/28 15:38:06 INFO namenode.FSNamesystem: InvalidateQueue QueueProcessingStatistics: First cycle completed 0 blocks in 0 msec 
13/05/28 15:38:06 INFO namenode.FSNamesystem: InvalidateQueue QueueProcessingStatistics: Queue flush completed 0 blocks in 0 msec processing time, 0 msec clock time, 1 cycles 
13/05/28 15:38:06 INFO namenode.FSNamesystem: Roll Edit Log from 192.168.128.138 
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of transactions: 0 Total time for transactions(ms): 0Number of transactions batched in Syncs: 0 Number of syncs: 0 SyncTimes(ms): 0  
13/05/28 15:38:06 INFO namenode.FSNamesystem: Roll FSImage from 192.168.128.138 
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of transactions: 0 Total time for transactions(ms): 0Number of transactions batched in Syncs: 0 Number of syncs: 1 SyncTimes(ms): 5  

hadoop@hadoop:~/hadoop-1.0.4/bin$ ./hadoop namenode -importCheckPoint
13/05/28 15:37:14 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = hadoop/192.168.128.138
STARTUP_MSG:   args = [-importCheckPoint]
STARTUP_MSG:   version = 1.0.4
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1393290; compiled by 'hortonfo' on Wed Oct  3 05:13:58 UTC 2012
************************************************************/
13/05/28 15:37:14 INFO impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
13/05/28 15:37:14 INFO impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.
13/05/28 15:37:14 INFO impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
13/05/28 15:37:14 INFO impl.MetricsSystemImpl: NameNode metrics system started
13/05/28 15:37:14 INFO impl.MetricsSourceAdapter: MBean for source ugi registered.
13/05/28 15:37:14 WARN impl.MetricsSystemImpl: Source name ugi already exists!
13/05/28 15:37:14 INFO impl.MetricsSourceAdapter: MBean for source jvm registered.
13/05/28 15:37:14 INFO impl.MetricsSourceAdapter: MBean for source NameNode registered.
13/05/28 15:37:14 INFO util.GSet: VM type       = 32-bit
13/05/28 15:37:14 INFO util.GSet: 2% max memory = 19.33375 MB
13/05/28 15:37:14 INFO util.GSet: capacity      = 2^22 = 4194304 entries
13/05/28 15:37:14 INFO util.GSet: recommended=4194304, actual=4194304
13/05/28 15:37:14 INFO namenode.FSNamesystem: fsOwner=hadoop
13/05/28 15:37:14 INFO namenode.FSNamesystem: supergroup=supergroup
13/05/28 15:37:14 INFO namenode.FSNamesystem: isPermissionEnabled=false
13/05/28 15:37:14 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100
13/05/28 15:37:14 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)
13/05/28 15:37:15 INFO namenode.FSNamesystem: Registered FSNamesystemStateMBean and NameNodeMXBean
13/05/28 15:37:15 INFO namenode.NameNode: Caching file names occuring more than 10 times
13/05/28 15:37:15 INFO common.Storage: Storage directory /home/hadoop/fs/name is not formatted.
13/05/28 15:37:15 INFO common.Storage: Formatting ...
13/05/28 15:37:15 INFO common.Storage: Number of files = 8
13/05/28 15:37:15 INFO common.Storage: Number of files under construction = 0
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 loaded in 0 seconds.
13/05/28 15:37:15 INFO common.Storage: Edits file /home/hadoop/checkpoint/namesecodary/current/edits of size 4 edits # 0 loaded in 0 seconds.
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 saved in 0 seconds.
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 saved in 0 seconds.
13/05/28 15:37:15 INFO namenode.FSNamesystem: Number of transactions: 0 Total time for transactions(ms): 0Number of transactions batched in Syncs: 0 Number of syncs: 0 SyncTimes(ms): 0
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 saved in 0 seconds.
13/05/28 15:37:15 INFO common.Storage: Image file of size 755 saved in 0 seconds.
13/05/28 15:37:15 INFO namenode.NameCache: initialized with 0 entries 0 lookups
13/05/28 15:37:15 INFO namenode.FSNamesystem: Finished loading FSImage in 345 msecs
13/05/28 15:37:15 INFO hdfs.StateChange: STATE* Safe mode ON.
The ratio of reported blocks 0.0000 has not reached the threshold 0.9990. Safe mode will be turned off automatically.
13/05/28 15:37:15 INFO util.HostsFileReader: Refreshing hosts (include/exclude) list
13/05/28 15:37:15 INFO impl.MetricsSourceAdapter: MBean for source FSNamesystemMetrics registered.
13/05/28 15:37:15 INFO impl.MetricsSourceAdapter: MBean for source RpcDetailedActivityForPort9000 registered.
13/05/28 15:37:15 INFO impl.MetricsSourceAdapter: MBean for source RpcActivityForPort9000 registered.
13/05/28 15:37:15 INFO ipc.Server: Starting SocketReader
13/05/28 15:37:15 INFO namenode.NameNode: Namenode up at: hadoop/192.168.128.138:9000
13/05/28 15:37:35 INFO mortbay.log: Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
13/05/28 15:37:35 INFO http.HttpServer: Added global filtersafety (class=org.apache.hadoop.http.HttpServer$QuotingInputFilter)
13/05/28 15:37:35 INFO http.HttpServer: dfs.webhdfs.enabled = false
13/05/28 15:37:35 INFO http.HttpServer: Port returned by webServer.getConnectors()[0].getLocalPort() before open() is -1. Opening the listener on 50070
13/05/28 15:37:35 INFO http.HttpServer: listener.getLocalPort() returned 50070 webServer.getConnectors()[0].getLocalPort() returned 50070
13/05/28 15:37:35 INFO http.HttpServer: Jetty bound to port 50070
13/05/28 15:37:35 INFO mortbay.log: jetty-6.1.26
13/05/28 15:37:35 INFO mortbay.log: Started SelectChannelConnector@0.0.0.0:50070
13/05/28 15:37:35 INFO namenode.NameNode: Web-server up at: 0.0.0.0:50070
13/05/28 15:37:35 INFO ipc.Server: IPC Server Responder: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server listener on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 0 on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 1 on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 2 on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 3 on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 4 on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 5 on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 6 on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 7 on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 8 on 9000: starting
13/05/28 15:37:35 INFO ipc.Server: IPC Server handler 9 on 9000: starting
13/05/28 15:37:35 INFO hdfs.StateChange: BLOCK* NameSystem.registerDatanode: node registration from 192.168.128.138:50010 storage DS-2106362203-192.168.128.138-50010-1368229536640
13/05/28 15:37:35 INFO net.NetworkTopology: Adding a new node: /default-rack/192.168.128.138:50010
13/05/28 15:37:35 INFO hdfs.StateChange: STATE* Safe mode extension entered.
The ratio of reported blocks 1.0000 has reached the threshold 0.9990. Safe mode will be turned off automatically in 29 seconds.
13/05/28 15:37:35 INFO hdfs.StateChange: *BLOCK* NameSystem.processReport: from 192.168.128.138:50010, blocks: 1, processing time: 10 msecs
13/05/28 15:37:56 INFO hdfs.StateChange: STATE* Safe mode ON.
The ratio of reported blocks 1.0000 has reached the threshold 0.9990. Safe mode will be turned off automatically in 9 seconds.
13/05/28 15:38:06 INFO namenode.FSNamesystem: Total number of blocks = 1
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of invalid blocks = 0
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of under-replicated blocks = 1
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of  over-replicated blocks = 0
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* Safe mode termination scan for invalid, over- and under-replicated blocks completed in 56 msec
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* Leaving safe mode after 51 secs.
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* Safe mode is OFF.
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* Network topology has 1 racks and 1 datanodes
13/05/28 15:38:06 INFO hdfs.StateChange: STATE* UnderReplicatedBlocks has 1 blocks
13/05/28 15:38:06 INFO namenode.FSNamesystem: ReplicateQueue QueueProcessingStatistics: First cycle completed 0 blocks in 1 msec
13/05/28 15:38:06 INFO namenode.FSNamesystem: ReplicateQueue QueueProcessingStatistics: Queue flush completed 0 blocks in 1 msec processing time, 1 msec clock time, 1 cycles
13/05/28 15:38:06 INFO namenode.FSNamesystem: InvalidateQueue QueueProcessingStatistics: First cycle completed 0 blocks in 0 msec
13/05/28 15:38:06 INFO namenode.FSNamesystem: InvalidateQueue QueueProcessingStatistics: Queue flush completed 0 blocks in 0 msec processing time, 0 msec clock time, 1 cycles
13/05/28 15:38:06 INFO namenode.FSNamesystem: Roll Edit Log from 192.168.128.138
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of transactions: 0 Total time for transactions(ms): 0Number of transactions batched in Syncs: 0 Number of syncs: 0 SyncTimes(ms): 0
13/05/28 15:38:06 INFO namenode.FSNamesystem: Roll FSImage from 192.168.128.138
13/05/28 15:38:06 INFO namenode.FSNamesystem: Number of transactions: 0 Total time for transactions(ms): 0Number of transactions batched in Syncs: 0 Number of syncs: 1 SyncTimes(ms): 5 5.在kill掉namenode后，50070界面就不能访问了，但是使用了4的命令后，这个界面又可以访问了。但是使用CTRL+c后50070页面又不可以访问了，这时使用命令./hadoop-daemon.sh  start namenode 后稍等片刻就又可以访问50070界面了。

 

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