# \_forcemerge blocking at the node or cluster level

**URL:** <https://discuss.elastic.co/t/forcemerge-blocking-at-the-node-or-cluster-level/108199>\
**Category:** Elasticsearch\
**Created:** [November 17, 2017, 9:01pm UTC](https://discuss.elastic.co/t/forcemerge-blocking-at-the-node-or-cluster-level/108199 "2017-11-17T21:01:39Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![JonathanAaron](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jonathanaaron/32/24405_2.png) [@JonathanAaron](https://discuss.elastic.co/u/JonathanAaron)\
**Post date:** [November 17, 2017, 9:01pm UTC](https://discuss.elastic.co/t/forcemerge-blocking-at-the-node-or-cluster-level/108199/1 "2017-11-17T21:01:39Z")

</div>

When the documentation says it's blocking messages. Is this at the node or cluster level. If I'm forcemerging one index will I be able to index into other indices?

---

<div class="post-metadata">

**Author:** ![theuntergeek](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/theuntergeek/32/44961_2.png) [@theuntergeek](https://discuss.elastic.co/u/theuntergeek)\
**Post date:** [November 17, 2017, 9:14pm UTC](https://discuss.elastic.co/t/forcemerge-blocking-at-the-node-or-cluster-level/108199/2 "2017-11-17T21:14:50Z")

</div>

Yes. But a long-running forcemerge is usually a disk I/O heavy operation, so indexing may be slower than normal.

---

<div class="post-metadata">

**Author:** ![JonathanAaron](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jonathanaaron/32/24405_2.png) [@JonathanAaron](https://discuss.elastic.co/u/JonathanAaron)\
**Post date:** [November 17, 2017, 9:16pm UTC](https://discuss.elastic.co/t/forcemerge-blocking-at-the-node-or-cluster-level/108199/3 "2017-11-17T21:16:37Z")

</div>

Thanks that's good to know! But what does it mean by blocking messages?

---

<div class="post-metadata">

**Author:** ![theuntergeek](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/theuntergeek/32/44961_2.png) [@theuntergeek](https://discuss.elastic.co/u/theuntergeek)\
**Post date:** [November 17, 2017, 9:33pm UTC](https://discuss.elastic.co/t/forcemerge-blocking-at-the-node-or-cluster-level/108199/4 "2017-11-17T21:33:07Z")

</div>

The client will not return until the forcemerge is complete.

---

<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:** [December 15, 2017, 9:33pm UTC](https://discuss.elastic.co/t/forcemerge-blocking-at-the-node-or-cluster-level/108199/5 "2017-12-15T21:33:28Z")

</div>

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