That's great. Thanks, Alex! 2015-10-02 0:36 GMT+08:00 Alexandre Dutra <alexandre.du...@datastax.com>:
> I confirm that the optional schema metadata feature (JAVA-828 > <https://datastax-oss.atlassian.net/browse/JAVA-828>) has been merged > upstream and is included in driver 3.0.0-alpha3 and will as well be > included in the forthcoming 2.1.8 version. > > On a side note, JAVA-664 > <https://datastax-oss.atlassian.net/browse/JAVA-664> has been open for > quite a while now and aims to fix the problem you describe. It will > hopefully make it into 2.1.8 as well, although I cannot guarantee that at > this point. > > Thanks, > > Alexandre Dutra > > On Mon, Sep 28, 2015 at 7:55 PM Alex Popescu <al...@datastax.com> wrote: > >> Besides the others' advice that 2000+ keyspaces might be too much, the >> latest Java driver (2.0.11) includes an option to disable the Metadata API >> http://www.datastax.com/dev/blog/datastax-java-driver-2-0-11-released. >> I'm not sure at this moment if this has been merged into 2.1 already. >> >> On Sun, Sep 20, 2015 at 9:22 AM, joseph gao <gaojf.bok...@gmail.com> >> wrote: >> >>> cassandra: 2.1.7 >>> java driver: datastax java driver 2.1.6 >>> >>> Here is the problem: >>> My application uses 2000+ keyspaces, and will dynamically create >>> keyspaces and tables. And then in java client, the >>> Metadata.tokenMap.tokenToHost would use about 1g memory. so this will cause >>> a lot of full gc. >>> As I see, the key of the tokenToHost is keyspace, and the value is a >>> tokenId_to_replicateNodes map. >>> >>> When I try to solve this problem, I find something not sure: all >>> keyspaces have same 'tokenId_to_replicateNodes' map. >>> My replication strategy of all keyspaces is : simpleStrategy and >>> replicationFactor is 3 >>> >>> So would it be possible if keyspaces use same strategy, the value of >>> tokenToHost map use a same map. So it would extremely reduce the memory >>> usage >>> >>> thanks a lot >>> >>> -- >>> ------ >>> Joseph Gao >>> PhoneNum:15210513582 >>> QQ: 409343351 >>> >> >> >> >> -- >> Bests, >> >> Alex Popescu | @al3xandru >> Sen. Product Manager @ DataStax >> >> >> >> <http://cassandrasummit-datastax.com/?utm_campaign=summit15&utm_medium=summiticon&utm_source=emailsignature> >> > -- > Alexandre Dutra > Driver & Tools Engineer @ DataStax > -- ------ Joseph Gao PhoneNum:15210513582 QQ: 409343351
