# Segmentation fault when scrolling in ES Python

**URL:** <https://discuss.elastic.co/t/segmentation-fault-when-scrolling-in-es-python/72305>\
**Category:** Elasticsearch\
**Created:** [January 20, 2017, 2:54pm UTC](https://discuss.elastic.co/t/segmentation-fault-when-scrolling-in-es-python/72305 "2017-01-20T14:54:54Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Mahdy\_S](https://avatars.discourse-cdn.com/v4/letter/m/59ef9b/32.png) [@Mahdy\_S](https://discuss.elastic.co/u/Mahdy_S)\
**Post date:** [January 20, 2017, 2:54pm UTC](https://discuss.elastic.co/t/segmentation-fault-when-scrolling-in-es-python/72305/1 "2017-01-20T14:54:54Z")

</div>

Hi There,

I am using ES Python API to calculate some stuff based on the data I stored in my ES cluster. For my calculation I need to call all documents which satisfy certain conditions and get certain information from them. Therefore I am doing a scroll with a size of 1000 and a duration of 1 second. I have written a Python script which uses ES-Python to do the job for me.

However, always after a little more than 1400 scrolls the script quits with the error "`Segmentation fault (core dumped)`". I have tried to increase the scroll size to 10000 instead but still the same problem happens. Following is the part of the script where I'm doing the scrolling:

```
page = Elasticsearch().search(index = my_index, scroll = "1s", size = 1000, body = { "_source" : ["_id", "@timestamp", my_field], "query" : {"bool":{"must" : [{"exists":{ "field" : my_field }},{"exists":{ "field" : "@timestamp" }}]}}})
sid = page['_scroll_id']
scroll_size = page['hits']['total']
while (scroll_size > 0):
    print "Scrolling..."
    # Get the number of results that we returned in the last scroll
    scroll_size = len(page['hits']['hits'])
    print "scroll size: " + str(scroll_size)
    page = Elasticsearch().scroll(scroll_id = sid, scroll = '1s')
    # Update the scroll ID
    sid = page['_scroll_id']

```

I could find out that the line `page = Elasticsearch().scroll(scroll_id = sid, scroll = '1s')` is responsible for the error. I have checked the scroll id and it is always the same (at least until the error is thrown).  
Has anybody faced a similar problem or does anybody know how this can be solved?

---

<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:** [February 17, 2017, 2:54pm UTC](https://discuss.elastic.co/t/segmentation-fault-when-scrolling-in-es-python/72305/2 "2017-02-17T14:54:58Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.