# Configure translog parameters and flush period

**URL:** <https://discuss.elastic.co/t/configure-translog-parameters-and-flush-period/269509>\
**Category:** Elasticsearch\
**Created:** [April 7, 2021, 6:29pm UTC](https://discuss.elastic.co/t/configure-translog-parameters-and-flush-period/269509 "2021-04-07T18:29:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rschirin](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rschirin/32/45283_2.png) [@rschirin](https://discuss.elastic.co/u/rschirin)\
**Post date:** [April 7, 2021, 6:29pm UTC](https://discuss.elastic.co/t/configure-translog-parameters-and-flush-period/269509/1 "2021-04-07T18:29:32Z")

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hey there, I'm trying to understand correctly how to configure translog parameters.  
Taking a look to official documentation I have a doubt regarding `index.translog.sync_interval`  
I am moving in this scenario:  
`index.translog.flush_threshold_size: default to 512mb`  
`index.translog.flush_threshold_ops: default to unlimited so ignored`  
`index.translog.flush_threshold_period: 10m`  
`index.translog.interval: default to 5s`

So, translog will be checked every 5 seconds to see if a `flush` is needed, the `flush` operation should be performed only if the `size` value is reached **or** if the `period` is expired. is that correct?

then, how should I use `index.translog.sync_interval`? Is this value used to synchronize in-memory buffer docs and translog?

furthermore, if I check the thread\_pool count with `_cat/thread_pool?v&h=host,flush.completed` I can see the values increasing very quickly (from 10 to hundreds every 2 seconds) but when I check the translog with `_stats/translog`, the value of size\_in\_bytes is not 0.

what am I missing?

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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:** [May 5, 2021, 6:29pm UTC](https://discuss.elastic.co/t/configure-translog-parameters-and-flush-period/269509/2 "2021-05-05T18:29:47Z")

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