Hi Harsh I have a question. How namenode gets out of safemode in condition of data blocks lost, only administrator? Accordin to my experiences, the NN (0.21) stayed in safemode about several days before I manually turn safemode off. There were 2 blocks lost.
Chen On Wed, Jan 30, 2013 at 10:27 AM, Harsh J <[email protected]> wrote: > NN does recalculate new replication work to do due to unavailable > replicas ("under-replication") when it starts and receives all block > reports, but executes this only after out of safemode. When in > safemode, across the HDFS services, no mutations are allowed. > > On Wed, Jan 30, 2013 at 8:34 AM, Nan Zhu <[email protected]> wrote: > > Hi, all > > > > I'm wondering if HDFS is stopped, and some of the machines of the cluster > > are moved, some of the block replication are definitely lost for moving > > machines > > > > when I restart the system, will the namenode recalculate the data > > distribution? > > > > Best, > > > > -- > > Nan Zhu > > School of Computer Science, > > McGill University > > > > > > > > -- > Harsh J >
