# Indexing performance of V2.3.5

**URL:** <https://discuss.elastic.co/t/indexing-performance-of-v2-3-5/60071>\
**Category:** Elasticsearch\
**Created:** [September 8, 2016, 12:22pm UTC](https://discuss.elastic.co/t/indexing-performance-of-v2-3-5/60071 "2016-09-08T12:22:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Prinice\_Tony](https://avatars.discourse-cdn.com/v4/letter/p/9de0a6/32.png) [@Prinice\_Tony](https://discuss.elastic.co/u/Prinice_Tony)\
**Post date:** [September 8, 2016, 12:22pm UTC](https://discuss.elastic.co/t/indexing-performance-of-v2-3-5/60071/1 "2016-09-08T12:22:15Z")

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Hi all, we are evaluating indexing performance of V2.3.5, comparing with V1.7.5, the cluster nodes of the two versions are the same as:

```
o 1 client node
o 8 data nodes
o 3 masters nodes
    o standard analyzer
    o the same source documents on the same index
    o same mappings and settings including shard number and replicas

```

we are using scroll API on a jump box node inside the cluster to do indexing test and getting below data:

in V1.7.5 indexing time of tests by locales:

en-us,02:16:36

ar-eg, 01:49:51

ru-ru, 01:00:08

en-gb, 00:54:31

tr-tr, 00:45:51

in V2.3.5 indexing time of tests by locales:

en-us, 03:13:30

ar-eg, 02:37:54

ru-ru, 01:27:39

en-gb, 01:15:35

tr-tr, 01:05:26

as can be seen indexing time of all tests grows in V2.3.5 test.

I saw there's change about doc value default change write on disk in V2.3.5 which will bring up to 25% slower performance:  
[https://www.elastic.co/guide/en/elasticsearch/guide/1.x/doc-values.html](https://www.elastic.co/guide/en/elasticsearch/guide/1.x/doc-values.html)  
[https://www.elastic.co/guide/en/elasticsearch/reference/current/doc-values.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/doc-values.html)

but above performance data in our testing shows it's much more than 25%. (like en-us one it's 50%), any one can help explain why this happened in our testing?

or is there any default changes in V2.X we need to care in this comparison?

Thanks!  
Tony

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**Author:** ![Mark\_Harwood](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mark_harwood/32/10538_2.png) [@Mark\_Harwood](https://discuss.elastic.co/u/Mark_Harwood)\
**Post date:** [September 8, 2016, 1:10pm UTC](https://discuss.elastic.co/t/indexing-performance-of-v2-3-5/60071/2 "2016-09-08T13:10:21Z")

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In the interests of improved durability there was a change to the settings around fsync frequency. If you want to optimise for performance you can relax these settings but be aware of the implications - see [https://www.elastic.co/guide/en/elasticsearch/reference/current/index-modules-translog.html#\_translog\_settings](https://www.elastic.co/guide/en/elasticsearch/reference/current/index-modules-translog.html#_translog_settings)

---

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 10:21pm UTC](https://discuss.elastic.co/t/indexing-performance-of-v2-3-5/60071/3 "2017-07-05T22:21:49Z")

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Closed on July 5, 2017, 10:21pm UTC