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From Biju N <bijuatapa...@gmail.com>
Subject Re: Restarting HDFS datanode process
Date Fri, 19 Sep 2014 13:09:45 GMT
Thanks Ted.

On Thu, Sep 18, 2014 at 3:34 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> DFSClient would resume reading from where it stops from the next data node.
>
> Cheers
>
> On Thu, Sep 18, 2014 at 11:53 AM, Biju N <bijuatapache@gmail.com> wrote:
>
> > It is for the duration of the restart. The concern is what will happen to
> > any reads which is inflight that is using the data node. Will HDFS client
> > know the offset to start reading from where the read failed using another
> > DN?
> >
> > On Thu, Sep 18, 2014 at 1:57 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> >
> > > How long would your datanode be out of service ?
> > >
> > > If the duration is long (say 1 day), you'd better decommission it
> first.
> > >
> > > Otherwise, datanode restart can be done without going through
> > > decommissioning.
> > >
> > > On Thu, Sep 18, 2014 at 8:25 AM, Biju N <bijuatapache@gmail.com>
> wrote:
> > >
> > > > Hello There,
> > > >      Can individual datanodes restarted (through service command) or
> do
> > > we
> > > > need to add it to the exclude file in NN, restart DN it, remove it
> from
> > > the
> > > > exclude file in NN as if the data node is being decommissioned and
> put
> > > > back? Any feedback on this is much appreciated.
> > > >
> > > > Thanks,
> > > > Biju
> > > >
> > >
> >
>

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