# Dumping index is slow as hell **URL:** \ **Category:** Elasticsearch\ **Created:** [February 25, 2014, 1:11pm UTC](https://discuss.elastic.co/t/dumping-index-is-slow-as-hell/16009 "2014-02-25T13:11:58Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Attila\_Bukor](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/attila_bukor/32/1667_2.png) [@Attila\_Bukor](https://discuss.elastic.co/u/Attila_Bukor)\ **Post date:** [February 25, 2014, 1:11pm UTC](https://discuss.elastic.co/t/dumping-index-is-slow-as-hell/16009/1 "2014-02-25T13:11:58Z")
Hey guys, I needed to migrate an index to a new cluster and after a lot of hesitating I decided to give it a try to taskrabbit's elasticsearch-dump: > **[taskrabbit/elasticsearch-dump](https://github.com/taskrabbit/elasticsearch-dump)** > > elasticsearch-dump - Import and export tools for elasticsearch I tested it with 10k documents, which worked fine, so I decided to migrate the real data to the new cluster with the following command: elasticdump --input=http://oldcluster:9200/my\_index --output=http://newcluster:9200/my\_index "my\_index" contains ~5 million documents, so I expected it to take a while, but not _this_ long. It's been running since 10 AM UTC+1 yesterday and it's migrated only a bit over 1.5 million docs so far - in roughly 28 hours. When it started, it indexed around 100 docs per second, by the time I went home from work (around 5 PM UTC+1), it was only around 30 docs/s, now it's around 10 docs/s. Being a newbie with ElasticSearch, I don't even know how to diagnose what is the reason of this slowness. Could you help me with this? Keep in mind that I'm at work for 2 or 3 more hours today, but after that, I won't have access to the servers until next Monday. Feel free to suggest anything in that time too, I will read it and try to reply, but can't look into anything or do anything about it. Regards, Attila Bukor -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/lei4qh%24370%241%40ger.gmane.org](https://groups.google.com/d/msgid/elasticsearch/lei4qh%24370%241%40ger.gmane.org). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![Binh\_Ly](https://avatars.discourse-cdn.com/v4/letter/b/ce7236/32.png) [@Binh\_Ly](https://discuss.elastic.co/u/Binh_Ly)\ **Post date:** [February 25, 2014, 3:33pm UTC](https://discuss.elastic.co/t/dumping-index-is-slow-as-hell/16009/2 "2014-02-25T15:33:30Z")
Not sure about the answer to your question, but if you're on ES 1.0, you might want to give snapshot/restore a try: [http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-snapshots.html](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-snapshots.html) -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/220e04db-04d0-4fc3-bdaa-6792f4ddc6f9%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/220e04db-04d0-4fc3-bdaa-6792f4ddc6f9%40googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![jprante](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jprante/32/44941_2.png) [@jprante](https://discuss.elastic.co/u/jprante)\ **Post date:** [February 25, 2014, 7:43pm UTC](https://discuss.elastic.co/t/dumping-index-is-slow-as-hell/16009/3 "2014-02-25T19:43:28Z")
Have you benchmarked your cluster? How many docs can you index per second with bulk indexing? Jörg -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH%3DEDqwhKC%3DgZXOwvdf%2B6FJ%3DBOrLmNFpSuraX2-JcTbYA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAKdsXoH%3DEDqwhKC%3DgZXOwvdf%2B6FJ%3DBOrLmNFpSuraX2-JcTbYA%40mail.gmail.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**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, 1:47am UTC](https://discuss.elastic.co/t/dumping-index-is-slow-as-hell/16009/4 "2017-07-06T01:47:20Z")