# Error when using ScrollAll for millions of records

**URL:** <https://discuss.elastic.co/t/error-when-using-scrollall-for-millions-of-records/187220>\
**Category:** Elasticsearch\
**Created:** [June 25, 2019, 3:27am UTC](https://discuss.elastic.co/t/error-when-using-scrollall-for-millions-of-records/187220 "2019-06-25T03:27:01Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![SudevPK](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@SudevPK](https://discuss.elastic.co/u/SudevPK)\
**Post date:** [June 25, 2019, 3:27am UTC](https://discuss.elastic.co/t/error-when-using-scrollall-for-millions-of-records/187220/1 "2019-06-25T03:27:01Z")

</div>

Error scrolling search on /\_search/scroll?pretty=true with slice 4 was not valid on scroll iteration 1

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<div class="post-metadata">

**Author:** ![SudevPK](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@SudevPK](https://discuss.elastic.co/u/SudevPK)\
**Post date:** [June 25, 2019, 3:34am UTC](https://discuss.elastic.co/t/error-when-using-scrollall-for-millions-of-records/187220/2 "2019-06-25T03:34:19Z")

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**Code Used**

```
var observable = fromElasticClient.ScrollAll<type>(
                    "1m"
                    , numberOfShards
                    , s => s
                        .MaxDegreeOfParallelism(numberOfShards / 2)
                        .Search(search => search
                                .Size(1000)
                                .Index(fromIndexName)
                                .AllTypes()
                                .MatchAll()
                        )
                );
var waitHandle = new ManualResetEvent(false);
Exception exception = null;
observable.Subscribe(new ScrollAllObserver<type>(
                    onNext: r =>
                    {
                        //Partial Update code here
                        Interlocked.Add(ref seenDocuments, r.SearchResponse.Hits.Count);
                    },
                    onError: e =>
                    {
                        exception = e;
                        logger.Error("Error " + e.Message);
                        waitHandle.Set();
                    },
                    onCompleted: () => waitHandle.Set()
                ));
                waitHandle.WaitOne();
                if (exception != null)
                    throw exception;
```

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<div class="post-metadata">

**Author:** ![SudevPK](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@SudevPK](https://discuss.elastic.co/u/SudevPK)\
**Post date:** [June 26, 2019, 9:17am UTC](https://discuss.elastic.co/t/error-when-using-scrollall-for-millions-of-records/187220/3 "2019-06-26T09:17:07Z")

</div>

Any upadte?

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 24, 2019, 9:17am UTC](https://discuss.elastic.co/t/error-when-using-scrollall-for-millions-of-records/187220/4 "2019-07-24T09:17:10Z")

</div>

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