Hi Adam,
Thanks for the reply. The changes I was referring was in FileSystem.java
layer which should not affect HDFS Replication/NameNode operations.
To give better idea this would affect clients something like this
Configuration conf = new Configuration();
conf.setInt("read.bandwitdh.mbpersec", 20); // 20MB/s
FileSystem fs = FileSystem.get(conf);
FSDataInputStream fis = fs.open("/path/to/file.xt");
fis.read(); // <-- This would be max of 20MB/s
2013/11/11 Adam Muise <amu...@hortonworks.com>
> See https://issues.apache.org/jira/browse/HDFS-3475
>
> Please note that this has met with many unexpected impacts on workload. Be
> careful and be mindful of your Datanode memory and network capacity.
>
>
>
>
> On Mon, Nov 11, 2013 at 1:59 PM, lohit <lohit.vijayar...@gmail.com> wrote:
>
> > Hello Devs,
> >
> > Wanted to reach out and see if anyone has thought about ability to
> throttle
> > data transfer within HDFS. One option we have been thinking is to
> throttle
> > on a per FileSystem basis, similar to Statistics in FileSystem. This
> would
> > mean anyone with handle to HDFS/Hftp will be throttled globally within
> JVM.
> > Right value to come up for this would be based on type of hardware we use
> > and how many tasks/clients we allow.
> >
> > On the other hand doing something like this at FileSystem layer would
> mean
> > many other tasks such as Job jar copy, DistributedCache copy and any
> hidden
> > data movement would also be throttled. We wanted to know if anyone has
> had
> > such requirement on their clusters in the past and what was the thinking
> > around it. Appreciate your inputs/comments
> >
> > --
> > Have a Nice Day!
> > Lohit
> >
>
>
>
> --
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Have a Nice Day!
Lohit
