Muthu, Look at Ignite Uuid#randomUuid() method. I think it will provide needed guarantees for your case.
On Mon, Jun 12, 2017 at 9:53 PM, Muthu <muthu.kumara...@gmail.com> wrote: > Thanks Nikolai..this is what i am doing...not sure if this is too > much..what do you think..the goal is to make sure that a UUID is unique > across the entire application (the problem is each node that is part of the > cluster would be doing this for different entities that it owns) > > ... > ... > System.out.println("==== in ObjectCacheMgrService.insertDepartment ==== > for dept : " + dept); > long t1 = System.currentTimeMillis(); > *String uUID = new IgniteUuid(UUID.randomUUID(), > igniteAtomicSequence.incrementAndGet()).toString();* > long t2 = System.currentTimeMillis(); > System.out.println("Time for UUID generation (millis) : " + (t2 - t1)); > *dept.setId(uUID);* > * deptCache.getAndPut(uUID, dept);* > System.out.println("==== in ObjectCacheMgrService.insertDepartment : > department ==== inserted successfully : " + dept); > ... > ... > > Regards, > Muthu > > On Mon, Jun 12, 2017 at 3:24 AM, Nikolai Tikhonov <ntikho...@apache.org> > wrote: > >> Muthu, >> >> Yes, you can use IgniteUUID as unique ID generator. What you will use >> depends your requirements. IgniteAtomicSequence takes one long and >> IgniteUUID takes 3 long. But getting new range sequence is distributed >> operation. You need to decied what more critical for your. >> >> On Fri, Jun 9, 2017 at 8:46 PM, Muthu <muthu.kumara...@gmail.com> wrote: >> >>> >>> Missed adding this one...i know there is support for ID generation with >>> IgniteAtomicSequence @ https://apacheignite.readme.io/docs/id-generator >>> >>> The question is which one should i use...i want to use this to generate >>> unique ids for entities that are to be cached & persisted.. >>> >>> Regards, >>> Muthu >>> >>> >>> On Fri, Jun 9, 2017 at 10:27 AM, Muthu <muthu.kumara...@gmail.com> >>> wrote: >>> >>>> Hi Folks, >>>> >>>> Is it possible to generate a Grid/Cluster unique UUID using IgniteUuid. >>>> I looked at the source code & static factory method *randomUuid >>>> <https://ignite.apache.org/releases/latest/javadoc/org/apache/ignite/lang/IgniteUuid.html#randomUuid%28%29>*(). >>>> It looks like it generates one with with a java.util.UUID (generated with >>>> its randomUUID) & an AutomicLong's incrementAndGet >>>> >>>> Can i safely assume that given that it uses a combination of UUID & >>>> long on the individual VMs that are part of the Grid/Cluster it will be >>>> unique or is there a better way? >>>> >>>> Regards, >>>> Muthu >>>> >>> >>> >> >