thanks Hardik, I did a bit of reading on 'stale' state in HDFS-3703 it says stale state as a state that is between dead and alive. And that the value for marking a node as dead is 10.30 minutes. But can this be configured?
Please help. On Wed, Jan 1, 2014 at 2:46 AM, Hardik Pandya <smarty.ju...@gmail.com>wrote: > <property> > <name>dfs.heartbeat.interval</name> > <value>3</value> > <description>Determines datanode heartbeat interval in > seconds.</description> > </property> > > and may be you are looking for > > > <property> > <name>*dfs.namenode.stale.datanode.interval<*/name> > <value>30000</value> > <description> > Default time interval for marking a datanode as "stale", i.e., if > the namenode has not received heartbeat msg from a datanode for > more than this time interval, the datanode will be marked and treated > as "stale" by default. The stale interval cannot be too small since > otherwise this may cause too frequent change of stale states. > We thus set a minimum stale interval value (the default value is 3 > times > of heartbeat interval) and guarantee that the stale interval cannot be > less > than the minimum value. > </description> > > > On Fri, Dec 27, 2013 at 10:10 PM, Vishnu Viswanath < > vishnu.viswanat...@gmail.com> wrote: > >> well i couldn't find any property in >> http://hadoop.apache.org/docs/r1.2.1/hdfs-default.html that sets the >> time interval time consider a node as dead. >> >> I saw there is a property dfs.namenode.heartbeat.recheck-interval or >> heartbeat.recheck.interval, but i couldn't find it there. is it removed? >> or am i looking at wrong place? >> >> >> On Sat, Dec 28, 2013 at 7:36 AM, Chris Embree <cemb...@gmail.com> wrote: >> >>> Maybe I'm just grouchy tonight.. it's seems all of these questions can >>> be answered by RTFM. >>> http://hadoop.apache.org/docs/current2/hadoop-project-dist/hadoop-hdfs/HdfsUserGuide.html >>> >>> What's the balance between encouraging learning by New to Hadoop users >>> and OMG!? >>> >>> >>> On Fri, Dec 27, 2013 at 8:58 PM, Vishnu Viswanath < >>> vishnu.viswanat...@gmail.com> wrote: >>> >>>> Hi all, >>>> >>>> Can someone tell me these: >>>> >>>> 1) which property in hadoop conf sets the time limit to consider a node >>>> as dead? >>>> 2) after detecting a node as dead, after how much time does hadoop >>>> replicates the block to another node? >>>> 3) if the dead node comes alive again, in how much time does hadoop >>>> identifies a block as over-replicated and when does it deletes that block? >>>> >>>> Regards, >>>> >>> >>> >> >
