# Final request when scroll-scanning has 0 successful shards
**URL:** https://discuss.elastic.co/t/final-request-when-scroll-scanning-has-0-successful-shards/19065
**Category:** Elasticsearch
**Created:** [August 4, 2014, 10:54am UTC](https://discuss.elastic.co/t/final-request-when-scroll-scanning-has-0-successful-shards/19065 "2014-08-04T10:54:46Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Tim\_S](https://discuss.elastic.co/u/Tim_S)
#### Post date: [August 4, 2014, 10:54am UTC](https://discuss.elastic.co/t/final-request-when-scroll-scanning-has-0-successful-shards/19065/1 "2014-08-04T10:54:46Z")
When scroll-scanning
[http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/search-request-scroll.html#scroll-scan](http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/search-request-scroll.html#scroll-scan),
I keep scrolling until I get a result that returns 0 docs, which is what
the docs seem to suggest that I should do.
But the final request (the one that returns 0 docs), always has
\_shards.successful=0. Normally, I’d consider this to indicate a failure (no
shards responded). If doing a normal (non-scan) scroll, \_shards.successful=1
(I’ve got 1 shard in this case), even when I’ve got to the point where
there’s no more docs to scroll.
Is this a bug in the scanning? Or am I wrong to consider the
\_shards.successful=0 to indicate a failure?
Tested on version 1.3.1.
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### Author:  [@Clinton\_Gormley](https://discuss.elastic.co/u/Clinton_Gormley)
#### Post date: [August 4, 2014, 11:26am UTC](https://discuss.elastic.co/t/final-request-when-scroll-scanning-has-0-successful-shards/19065/2 "2014-08-04T11:26:27Z")
This is correct. On the last request, no hits are returned because all
shards have already been drained of results. If you look at shards.total
and shards.failed, you'll see they are also 0
clint
On 4 August 2014 12:54, Tim S [timstibbs@gmail.com](mailto:timstibbs@gmail.com) wrote:
> When scroll-scanning
> [http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/search-request-scroll.html#scroll-scan](http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/search-request-scroll.html#scroll-scan),
> I keep scrolling until I get a result that returns 0 docs, which is what
> the docs seem to suggest that I should do.
>
> But the final request (the one that returns 0 docs), always has
> \_shards.successful=0. Normally, I’d consider this to indicate a failure
> (no shards responded). If doing a normal (non-scan) scroll,
> \_shards.successful=1 (I’ve got 1 shard in this case), even when I’ve got
> to the point where there’s no more docs to scroll.
>
> Is this a bug in the scanning? Or am I wrong to consider the
> \_shards.successful=0 to indicate a failure?
>
> Tested on version 1.3.1.
>
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### Author:  [@Tim\_S](https://discuss.elastic.co/u/Tim_S)
#### Post date: [August 4, 2014, 11:41am UTC](https://discuss.elastic.co/t/final-request-when-scroll-scanning-has-0-successful-shards/19065/3 "2014-08-04T11:41:54Z")
Yes, it makes sense in this case, it's just confusing because it happens
differently in other situations - when doing a normal scroll (not
scanning), shards.successful is non-zero even when you've reached the point
where there's no more results (and even if you keep going). And if you do a
search returning no results, shards.successful is also non-zero.
So, should I ever (not just when scrolling) consider shards.successful=0 to
indicate a failure? Or should I ignore it and only look at the
shards.failed?
On Monday, August 4, 2014 12:27:22 PM UTC+1, Clinton Gormley wrote:
> This is correct. On the last request, no hits are returned because all
> shards have already been drained of results. If you look at shards.total
> and shards.failed, you'll see they are also 0
>
> clint
>
> On 4 August 2014 12:54, Tim S \<[tims...@gmail.com](mailto:tims...@gmail.com) \\> wrote:
>
> > When scroll-scanning
> > [http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/search-request-scroll.html#scroll-scan](http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/search-request-scroll.html#scroll-scan),
> > I keep scrolling until I get a result that returns 0 docs, which is what
> > the docs seem to suggest that I should do.
> >
> > But the final request (the one that returns 0 docs), always has
> > \_shards.successful=0. Normally, I’d consider this to indicate a failure
> > (no shards responded). If doing a normal (non-scan) scroll,
> > \_shards.successful=1 (I’ve got 1 shard in this case), even when I’ve got
> > to the point where there’s no more docs to scroll.
> >
> > Is this a bug in the scanning? Or am I wrong to consider the
> > \_shards.successful=0 to indicate a failure?
> >
> > Tested on version 1.3.1.
> >
> > --
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> > To view this discussion on the web visit
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> > [https://groups.google.com/d/msgid/elasticsearch/3998b393-476d-4fc4-a809-a15da19bdf8d%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/3998b393-476d-4fc4-a809-a15da19bdf8d%40googlegroups.com?utm_medium=email&utm_source=footer)
> > .
> > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:11am UTC](https://discuss.elastic.co/t/final-request-when-scroll-scanning-has-0-successful-shards/19065/4 "2017-07-06T01:11:04Z")