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From Bingtao Yin <ybts...@gmail.com>
Subject Re: Optimize FTS memory footprint
Date Sun, 03 Dec 2017 02:42:25 GMT
Thanks, mike. I'm facing a similar problem.
I'm running a 2.0 elasticsearch cluster, and find the fst of _uid field
takes a lot of memory. The _uid field is not analyzed and generated by
elasticsearch, which also has high cardinality.
Is there any ways to  reduce memory cost for _uid field? Thanks.


2017-11-29 5:47 GMT+08:00 elirev <elirevach12@gmail.com>:

> Thanks   Mike .
> I did not  find  any  clear  way to know it its FST or Norm , or something
> else ( unless i miss something )  the fact the FST is an in memory prefix
> index lead me to think it using most of the heap   .
> Our  mapping is normal with around of 200 columns one of the columns is
> nested object with limited amount of objects (up to 4 instances  )   , we
> are using monthly base indexes  (keep 6 month open ) . In last month  i see
> dramatic extra  allocation on the segment memory (around 30% where in
> regulare    month is around 5%)  , the only change i see is that the nested
> object is now include avg 8 instances  )  , this increases the amount of
> the hidden document we have now on the  index (about more then twice) .
> When we optimize the index the amount of allocation memory was reduced (we
> see it only after rolling restart the nodes )   .
>
> If you don't mind  i have few question :
> 1) Do you know about an  way  to figure   out which component is taking all
> this memory .
> 2) Do you see relation between the fact that the nested objects was
> increases to the extra memory allocation we have ?
> 3) Did FST memory usage is  impacted by the fact we optimize the
> problematic
> index  and why  we see it only after restarting ES service
>
> Thanks mike
>
> .
>
>
>
>
>
>
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