# Getting informed of moving shards in the cluster **URL:** \ **Category:** Elasticsearch\ **Created:** [October 3, 2012, 9:43am UTC](https://discuss.elastic.co/t/getting-informed-of-moving-shards-in-the-cluster/9223 "2012-10-03T09:43:07Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\ **Post date:** [October 3, 2012, 9:43am UTC](https://discuss.elastic.co/t/getting-informed-of-moving-shards-in-the-cluster/9223/1 "2012-10-03T09:43:07Z")
Hi, is there any possibility to get informed, when a shard is moved from one instance to another or when it is being deleted? I'd like to free up some in-memory resources in case that happens in my AbstractIndexShardComponent. Regards, Alexander -- ---
**Author:** ![Ivan](https://avatars.discourse-cdn.com/v4/letter/i/df788c/32.png) [@Ivan](https://discuss.elastic.co/u/Ivan)\ **Post date:** [October 3, 2012, 4:14pm UTC](https://discuss.elastic.co/t/getting-informed-of-moving-shards-in-the-cluster/9223/2 "2012-10-03T16:14:46Z")
Alexander, For the former, you probably can poll the cluster state for reallocating shards. Not very efficient, but since shard reallocation can take some time for non-trivial indices (large shards), the polling interval can be large. Deletions would be tough. When exactly is a shard deleted in Elasticsearch? The only scenario I can think of is during a reallocation (copy and deleted) and when the numbers of replicas is reduced (which is under user control). -- Ivan On Wed, Oct 3, 2012 at 2:43 AM, Alexander Reelsen [alr@spinscale.de](mailto:alr@spinscale.de) wrote: > Hi, > > is there any possibility to get informed, when a shard is moved from > one instance to another or when it is being deleted? I'd like to free > up some in-memory resources in case that happens in my > AbstractIndexShardComponent. > > Regards, Alexander > > -- -- ---
**Author:** ![otisg](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/otisg/32/492_2.png) [@otisg](https://discuss.elastic.co/u/otisg)\ **Post date:** [October 3, 2012, 8:21pm UTC](https://discuss.elastic.co/t/getting-informed-of-moving-shards-in-the-cluster/9223/3 "2012-10-03T20:21:09Z")
Hi Alexander, I think I asked about this once on the ML and I think I subsequently opened an issue on Github. ## Otis Search Analytics - [Cloud Monitoring Tools & Services | Sematext](http://sematext.com/search-analytics/index.html) Performance Monitoring - [http://sematext.com/spm/index.htm](http://sematext.com/spm/index.htm) On Wednesday, October 3, 2012 5:43:15 AM UTC-4, Alexander Reelsen wrote: > Hi, > > is there any possibility to get informed, when a shard is moved from > one instance to another or when it is being deleted? I'd like to free > up some in-memory resources in case that happens in my > AbstractIndexShardComponent. > > Regards, Alexander -- ---
**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\ **Post date:** [October 5, 2012, 3:56pm UTC](https://discuss.elastic.co/t/getting-informed-of-moving-shards-in-the-cluster/9223/4 "2012-10-05T15:56:18Z")
Hi On Wed, Oct 3, 2012 at 10:21 PM, Otis Gospodnetic [otis.gospodnetic@gmail.com](mailto:otis.gospodnetic@gmail.com) wrote: > I think I asked about this once on the ML and I think I subsequently opened > an issue on Github. > Hm. What about IndicesLifecycle.Listener.beforeIndexShardClosed() - > which seems to do what I just want. It even handles deletes > differently. Calling this should be enough: indicesService.indicesLifecycle().addListener(new Listener() { /\* yadayadayada \*/ }) there is also a shardRoutingChanged() method... so I can catch deleted and shard moves (which in the end will likely also issue an delete on the shard moved, everything fine for me). --Alexander -- ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 3:09am UTC](https://discuss.elastic.co/t/getting-informed-of-moving-shards-in-the-cluster/9223/5 "2017-07-06T03:09:59Z")