Hi, Binh Thanks for your replies.
So it seems there are no ways to force two document to store in different shard. And I will read the document of the bitsets. Regards, Ivan Binh Ly於 2014年1月22日星期三UTC+8上午12時57分48秒寫道： > > Ivan, > > 5) You're right, two different routing values may has to the same shard. > > 8) About ES filters, this might help: > http://www.elasticsearch.org/blog/all-about-elasticsearch-filter-bitsets/ > > About your mapping question, the put mapping api will allow you to update > existing mappings. It can merge, if your new mapping does not conflict with > the old one, otherwise, you'll probably need to rebuild the index if there > is a conflict. > > On Monday, January 20, 2014 8:43:41 PM UTC-5, Ivan Ji wrote: >> >> Hi Bing, >> >> First, really thanks for your reply. According to the replies, I have few >> questions about it below. >> >> Binh Ly於 2014年1月21日星期二UTC+8上午5時10分10秒寫道： >>> >>> Ivan, >>> >> >>> 1) The multi_field type allows you to define different ways that a >>> *single field value* will be indexed. Your example below will work and will >>> index a single value as string/not_analyzed, and then as an int (use >>> "integer" for int) >>> >>> 2) The document coming in will contain a field named "name" with a >>> single value. When it goes into the index, it will be indexed 2 different >>> ways. >>> >>> 3) A mapping is not required to index data. There is an implied default >>> mapping that will parse your JSON content and dynamically update the schema >>> if you don't specify one up-front. >>> >>> 4) You cannot change the shard count after the index is created. You can >>> change the replica count anytime. The PUT mapping API allows you to change >>> the replica count. >>> >>> 5) You can specify a single routing value for all documents that you >>> want to go to a specific shard/location. >>> >> >> Yes, but can I control the two sets of document must be store in >> *different* shards? Because if I use different routing values, does it >> means it can be stored in different shard? I guest not, right? Although the >> hash value of these two values are different, I am not sure what the range >> that the routing value belong to a single shard. And I want ti store these >> documents in different shard. >> >> >>> >>> 6) The number of shards will allow you to scale your content later. So >>> if your data volume increases, you can add more nodes later and distribute >>> the shards around. If you only have a single shard and you run out of >>> space, then you cannot scale out unless you increase storage, or increase >>> the shard count. >>> >>> 7) Scroll is used to do a snapshot type of search - i.e., results you >>> get back will not be affected by updates to the index after you start >>> scrolling. From/size are useful if you want to do paging of search results >>> (or infinite scrolling but paged at a time). >>> >>> 8) Filters execute fast and yes can be cached. >>> >> >> About filters, I want to know the underlying algorithm. If I create an >> alias which represent about half the index, does it increase the index >> size? I mean if I create aliases, does it operate and store some really >> data about it into the storage? or it just remember the condition and >> process like some predefined adapter which cannot store something stored >> data inside the storage? >> >> >> Another question: >> What's the suggestion if I need to modify the mapping of some index, such >> as from store="no" to "yes", or remove some field ? >> Because after I read these days, it seems hard to change a existed >> mapping and there are much limitation of it. >> >> Again, thanks for your replies. >> >> Cheers, >> >> Ivan >> > -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/b44d5db2-6c0e-40cc-9d9f-80acee93d70d%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
