Hi, When I run my compute task, it throws below exception. What it may be caused by?
class org.apache.ignite.IgniteCheckedException: Task map operation produced no mapped jobs Thanks Shawn -----邮件原件----- 发件人: Shawn Du [mailto:[email protected]] 发送时间: 2017年1月9日 17:31 收件人: [email protected] 主题: 答复: compute SQL returned data. Thanks, I already figure it out just As you mentioned. -----邮件原件----- 发件人: dkarachentsev [mailto:[email protected]] 发送时间: 2017年1月9日 17:24 收件人: [email protected] 主题: Re: compute SQL returned data. Hi Shawn, For map-reduce operations is most suitable ComputeTask [1], which has map/reduce methods. In map() method you may select nodes on which start processing according to key (refer Ignite.affinity() [2,3]). Result will be reduced and returned to the client. In summary, client invokes SQL to collect keys and runs ComputeTask`s mapped on nodes that has keys/values that should be processed (this will allow not to transfer over network big values). [1] https://ignite.apache.org/releases/1.8.0/javadoc/org/apache/ignite/compute/C omputeTask.html [2] https://ignite.apache.org/releases/1.8.0/javadoc/org/apache/ignite/Ignite.ht ml#affinity(java.lang.String) [3] https://ignite.apache.org/releases/1.8.0/javadoc/org/apache/ignite/cache/aff inity/Affinity.html -- View this message in context: http://apache-ignite-users.70518.x6.nabble.com/compute-SQL-returned-data-tp9 890p9967.html Sent from the Apache Ignite Users mailing list archive at Nabble.com.
