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Posted to hdfs-dev@hadoop.apache.org by Hongxu Ma <in...@outlook.com> on 2017/07/26 07:31:04 UTC
Does hdfs support concurrent append?
Hi hdfs-dev
Question as the subject.
I googled some pages and wrote a test program to validate it.
Seems doesn't support (my test program gave: No lease on XXX error message).
Just for confirmation, thanks.
--
Regards,
Hongxu.
Re: Does hdfs support concurrent append?
Posted by Hongxu Ma <in...@outlook.com>.
Thanks Ravi, clear!
在 27/07/2017 03:51, Ravi Prakash 写道:
Hi Hongxu!
That is correct. At any point there can only be 1 writer. This is enforced by requiring the writer to acquire leases. There may be multiple readers.
HTH
Ravi
On Wed, Jul 26, 2017 at 12:31 AM, Hongxu Ma <in...@outlook.com>> wrote:
Hi hdfs-dev
Question as the subject.
I googled some pages and wrote a test program to validate it.
Seems doesn't support (my test program gave: No lease on XXX error message).
Just for confirmation, thanks.
--
Regards,
Hongxu.
--
Regards,
Hongxu.
Re: Does hdfs support concurrent append?
Posted by Ravi Prakash <ra...@gmail.com>.
Hi Hongxu!
That is correct. At any point there can only be 1 writer. This is enforced
by requiring the writer to acquire leases. There may be multiple readers.
HTH
Ravi
On Wed, Jul 26, 2017 at 12:31 AM, Hongxu Ma <in...@outlook.com> wrote:
> Hi hdfs-dev
>
> Question as the subject.
>
> I googled some pages and wrote a test program to validate it.
> Seems doesn't support (my test program gave: No lease on XXX error
> message).
>
> Just for confirmation, thanks.
>
> --
> Regards,
> Hongxu.
>