Thank you. I was thinking about that but I am not sure if it is fast enough. I will test and then decide to use zookeeper or other in memory database like redis. Thanks again!!
2015-05-21 发件人：Carlos Perelló Marín <[email protected]> 发送时间：2015-05-21 12:27 主题：Re: Re: sharing data between tasks in the same bolt or spout 收件人："user"<[email protected]> 抄送： 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 Marín https://www.serverdensity.com
