Re: How to disable secondary node
If a CheckpointNode or a BackupNode is used then the SecondaryNameNode should be disabled. --Konstantin On 9/9/2010 7:59 AM, Edward Capriolo wrote: It is a bad idea to permanently disable 2nn. The edits file grows very very large and will not be processed until the name node restart. We had a 12GB edit file that took 40 minutes of downtime to process. On Thu, Sep 9, 2010 at 3:08 AM, Jeff Zhang wrote: then, do not start secondary namenode ( comment the last line of start-dfs.sh # "$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters start secondarynamenode ) On Wed, Sep 8, 2010 at 11:36 PM, akhilesh.kumar wrote: Hi , Can any one help me in disabling secondary namenode feature of hdfs . Regards Akhilesh -Original Message- From: ChingShen [mailto:chingshenc...@gmail.com] Sent: Thursday, September 09, 2010 12:07 PM To: common-user@hadoop.apache.org Subject: Questions about BN and CN Hi all, I got the Backup node(BN) that includes all the checkpoint responsibilities, and it maintains an up-to-date namespace state, which is always in sync with the active NN. Q1. In which situation do we need a CN? Q2. If the NameNode machine fails, which different manual intervention between BN and CN? Thanks. Shen -- Best Regards Jeff Zhang
Re: How to disable secondary node
It is a bad idea to permanently disable 2nn. The edits file grows very very large and will not be processed until the name node restart. We had a 12GB edit file that took 40 minutes of downtime to process. On Thu, Sep 9, 2010 at 3:08 AM, Jeff Zhang wrote: > then, do not start secondary namenode > ( > comment the last line of start-dfs.sh > # "$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters > start secondarynamenode > ) > > > > On Wed, Sep 8, 2010 at 11:36 PM, akhilesh.kumar > wrote: >> Hi , >> Can any one help me in disabling secondary namenode feature of hdfs . >> >> Regards >> Akhilesh >> >> -Original Message- >> From: ChingShen [mailto:chingshenc...@gmail.com] >> Sent: Thursday, September 09, 2010 12:07 PM >> To: common-user@hadoop.apache.org >> Subject: Questions about BN and CN >> >> Hi all, >> >> I got the Backup node(BN) that includes all the checkpoint >> responsibilities, >> and it maintains an up-to-date namespace state, which is always in >> sync with the active NN. >> >> Q1. In which situation do we need a CN? >> >> Q2. If the NameNode machine fails, which different manual >> intervention between BN and CN? >> >> Thanks. >> >> Shen >> >> > > > > -- > Best Regards > > Jeff Zhang >
Re: How to disable secondary node
then, do not start secondary namenode ( comment the last line of start-dfs.sh # "$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters start secondarynamenode ) On Wed, Sep 8, 2010 at 11:36 PM, akhilesh.kumar wrote: > Hi , > Can any one help me in disabling secondary namenode feature of hdfs . > > Regards > Akhilesh > > -Original Message- > From: ChingShen [mailto:chingshenc...@gmail.com] > Sent: Thursday, September 09, 2010 12:07 PM > To: common-user@hadoop.apache.org > Subject: Questions about BN and CN > > Hi all, > > I got the Backup node(BN) that includes all the checkpoint > responsibilities, > and it maintains an up-to-date namespace state, which is always in > sync with the active NN. > > Q1. In which situation do we need a CN? > > Q2. If the NameNode machine fails, which different manual > intervention between BN and CN? > > Thanks. > > Shen > > -- Best Regards Jeff Zhang
How to disable secondary node
Hi , Can any one help me in disabling secondary namenode feature of hdfs . Regards Akhilesh -Original Message- From: ChingShen [mailto:chingshenc...@gmail.com] Sent: Thursday, September 09, 2010 12:07 PM To: common-user@hadoop.apache.org Subject: Questions about BN and CN Hi all, I got the Backup node(BN) that includes all the checkpoint responsibilities, and it maintains an up-to-date namespace state, which is always in sync with the active NN. Q1. In which situation do we need a CN? Q2. If the NameNode machine fails, which different manual intervention between BN and CN? Thanks. Shen
