Support Questions

asliyanage · ‎02-18-2017

I try to start the namenode severa times. but its not starting, so i check the log file. I found the below exception

2017-02-18 15:05:23,548 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.
java.io.IOException: There appears to be a gap in the edit log.  We expected txid 1, but got txid 44.
    at org.apache.hadoop.hdfs.server.namenode.MetaRecoveryContext.editLogLoaderPrompt(MetaRecoveryContext.java:94)
    at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:215)
    at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:143)
    at org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:843)
    at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:698)
    at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:294)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:975)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:681)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:585)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:645)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:812)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:796)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1493)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1559)
2017-02-18 15:05:23,552 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
2017-02-18 15:05:23,554 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at aruna/127.0.1.1
************************************************************/

It says gap in the edit log. I search the google and still not find any solution ?

All the other deamons are running

aruna@aruna:~/hadoop-2.7.3/sbin$ sudo jps
4177 DataNode
4545 ResourceManager
5042 JobHistoryServer
5605 Jps
4854 NodeManager
4360 SecondaryNameNode
aruna@aruna:~/hadoop-2.7.3/sbin$

jsensharma · ‎02-18-2017

@Aruna Sameera

Check if the service is up or not? It should open port 9000 if you have not changed the value of :

<configuration>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://localhost:9000</value>
    </property>
</configuration>

- Check port. If port is not opened then start the service or check configuration if it is supposed to start on 9000 port or not?

netstat -tnlpa | grep 9000

.

See:

https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/SingleCluster.html

View solution in original post

jsensharma · ‎02-20-2017

@Aruna Sameera As mentioned earlier as well that in order to maintain a good forum/community it is best that you ask one query per thread and mark the answer as "Accepted" when your answer is properly answered and was helpful. Keep asking different queries in a single thread and not Accepting answers that are helpful is not a good forum etiquette.

asliyanage · ‎02-20-2017

ok @Jay SenSharma . I did those things for all my questions

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Unable to start namenode