If the data is not too big, I guess you may use Zookeeper, it's already there and it's supposed to allow exactly the use case you want to cover...
On 21 May 2015 at 19:13, applyhhj <[email protected]> wrote: > Very clear answer, I guest I need to find other ways. Thank you very > much!! > > 2015-05-21 > ------------------------------ > ------------------------------ > > *发件人：*Dima Dragan <[email protected]> > *发送时间：*2015-05-21 12:02 > *主题：*Re: sharing data between tasks in the same bolt or spout > *收件人：*"user"<[email protected]> > *抄送：* > > Hi, > > for 1 worker you can create a class with your static thread-safe > collection and thread-safe initialization method (Double Checked Locking > & volatile, for example) which return collection reference . In bolt`s > prepare() method run init(). In this way all bolts will have the same ref > to collection. > > for case with more than 1 worker, previous option will not work, cause > each of worker has it`s own JVM process. You will have to persist your > collection in external database and implement static access to connection > pool. Each of worker will have it`s own pool. > > On Thu, May 21, 2015 at 7:41 PM, applyhhj <[email protected]> wrote: > >> Hi, >> Is it possible to share data between tasks of the same bolt or spout. >> For example, a string list is set as the shared data and referenced by all >> tasks of a bolt. Thank you very much!! >> >> >> 2015-05-21 >> ------------------------------ >> > > > > -- > Best regards, > Dmytro Dragan > > > -- Carlos Perelló Marínhttps://www.serverdensity.com
