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
