5 ms·

ES can indeed rebalance shards to new nodes as they join the cluster. More here: https://www.elastic.co/guide/en/elasticsearch/reference/current/disk-allocator.

• jdc0589 10y ago
  huh, the more you know. not sure how I've missed this. I'll definitely look for some discussions/use cases of how this actually plays out.
  • jazoom 10y ago
    I suspect you were thinking of changing the number of shards, which can be an important part of rebalancing an index. Unfortunately, Elasticsearch can't do that.
    • jonaf 10y ago
      There is a convenient reindex API available in more recent versions, although in most cases where you can rebuild your index anyway, it's faster to do that.
      • jazoom 10y ago
        Ahh. I was wondering when they were going to get around to implementing that. I might have to upgrade to 5.x soon.
        • wsgolfer 10y ago
          FYI, the reindex API was added as experimental in 2.3, so it's been there for about a year [1]. Even as experimental it worked great. [1] https://www.elastic.co/guide/en/elasticsearch/reference/2.3/docs-reindex.html https://www.elastic.co/guide/en/elasticsearch/reference/2.3/...
          • jazoom 10y ago
            Ha. I just came here to edit my comment. I remember seeing it before and just checked the docs again. In 5.2 it's STILL considered experiential. Craziness. It took me about an hour to build The basic functionality myself.
            • jasontedor 10y ago
              Thank you for noticing this, it is not considered experimental anymore. I integrated a change[1] to update the docs; it should percolate through to the site within thirty minutes. [1]: https://github.com/elastic/elasticsearch/pull/23621 https://github.com/elastic/elasticsearch/pull/23621
              • jazoom 10y ago
                Great work. It appears to have already percolated.
              • jdc0589 10y ago
                FYI, the re-index API is awesome.