Re: [controller-dev] Getting exception when using Transaction Chain
No - as I mentioned the caller must coordinate access. On Tue, Mar 7, 2017 at 2:06 AM, Satish Dutt <sd...@advaoptical.com> wrote: > Yes Tom, we are accessing a chain concurrently. Is there any waiting > mechanism provided by the transaction chain such that the transaction chain > waits for allocating a new one till the previous write transaction is > submitted ? > > > > Regards > > -Satish > > > > *From:* Tom Pantelis [mailto:tompante...@gmail.com] > *Sent:* Tuesday, March 07, 2017 2:38 AM > *To:* Satish Dutt <sd...@advaoptical.com> > *Cc:* Robert Varga <n...@hq.sk>; controller-us...@lists.opendaylight.org; > controller-dev@lists.opendaylight.org > > *Subject:* Re: [controller-dev] Getting exception when using Transaction > Chain > > > > It seems you're trying to access a chain concurrently? If so, this is not > supported. You must coordinate access to the chain such that the previous > write transaction is submitted before you allocate a new one. > > > > Tom > > > > On Mon, Mar 6, 2017 at 7:05 AM, Satish Dutt <sd...@advaoptical.com> wrote: > > Thanks Robert for the clarification. So to solve the issue, can I handle > this IllegalStateException and retry the read or write operations for a > finite number of times, which makes the best effort of previous > write-capable transactions to get completed. Or is there a more elegant way > of solving this issue ? > > Regards > -Satish > > > -Original Message- > From: Robert Varga [mailto:n...@hq.sk] > Sent: Monday, March 06, 2017 5:23 PM > To: Satish Dutt <sd...@advaoptical.com>; controller-users@lists. > opendaylight.org; controller-dev@lists.opendaylight.org > Subject: Re: [controller-dev] Getting exception when using Transaction > Chain > > On 03/06/2017 12:39 PM, Satish Dutt wrote: > > When multiple requests are sent concurrently, IllegalStateException is > > thrown. Is there any way to solve this issue, apart from synchronizing > > the method which does the above operations ? > > This is actually part of the API contract: > > https://github.com/opendaylight/controller/blob/ > a81d98f692b80c45bce3fe6a87e731abfb012a9f/opendaylight/md- > sal/sal-common-api/src/main/java/org/opendaylight/ > controller/md/sal/common/api/data/TransactionChain.java#L59 > > The reason is very simple: if there is a write-capable transaction open > and it has seen some modifications, does the second transaction observe > those modifications as applied or as unapplied? > > Bye, > Robert > > ___ > controller-dev mailing list > controller-dev@lists.opendaylight.org > https://lists.opendaylight.org/mailman/listinfo/controller-dev > > > ___ controller-dev mailing list controller-dev@lists.opendaylight.org https://lists.opendaylight.org/mailman/listinfo/controller-dev
Re: [controller-dev] Getting exception when using Transaction Chain
Yes Tom, we are accessing a chain concurrently. Is there any waiting mechanism provided by the transaction chain such that the transaction chain waits for allocating a new one till the previous write transaction is submitted ? Regards -Satish From: Tom Pantelis [mailto:tompante...@gmail.com] Sent: Tuesday, March 07, 2017 2:38 AM To: Satish Dutt <sd...@advaoptical.com> Cc: Robert Varga <n...@hq.sk>; controller-us...@lists.opendaylight.org; controller-dev@lists.opendaylight.org Subject: Re: [controller-dev] Getting exception when using Transaction Chain It seems you're trying to access a chain concurrently? If so, this is not supported. You must coordinate access to the chain such that the previous write transaction is submitted before you allocate a new one. Tom On Mon, Mar 6, 2017 at 7:05 AM, Satish Dutt <sd...@advaoptical.com<mailto:sd...@advaoptical.com>> wrote: Thanks Robert for the clarification. So to solve the issue, can I handle this IllegalStateException and retry the read or write operations for a finite number of times, which makes the best effort of previous write-capable transactions to get completed. Or is there a more elegant way of solving this issue ? Regards -Satish -Original Message- From: Robert Varga [mailto:n...@hq.sk<mailto:n...@hq.sk>] Sent: Monday, March 06, 2017 5:23 PM To: Satish Dutt <sd...@advaoptical.com<mailto:sd...@advaoptical.com>>; controller-us...@lists.opendaylight.org<mailto:controller-us...@lists.opendaylight.org>; controller-dev@lists.opendaylight.org<mailto:controller-dev@lists.opendaylight.org> Subject: Re: [controller-dev] Getting exception when using Transaction Chain On 03/06/2017 12:39 PM, Satish Dutt wrote: > When multiple requests are sent concurrently, IllegalStateException is > thrown. Is there any way to solve this issue, apart from synchronizing > the method which does the above operations ? This is actually part of the API contract: https://github.com/opendaylight/controller/blob/a81d98f692b80c45bce3fe6a87e731abfb012a9f/opendaylight/md-sal/sal-common-api/src/main/java/org/opendaylight/controller/md/sal/common/api/data/TransactionChain.java#L59 The reason is very simple: if there is a write-capable transaction open and it has seen some modifications, does the second transaction observe those modifications as applied or as unapplied? Bye, Robert ___ controller-dev mailing list controller-dev@lists.opendaylight.org<mailto:controller-dev@lists.opendaylight.org> https://lists.opendaylight.org/mailman/listinfo/controller-dev ___ controller-dev mailing list controller-dev@lists.opendaylight.org https://lists.opendaylight.org/mailman/listinfo/controller-dev
Re: [controller-dev] Getting exception when using Transaction Chain
It seems you're trying to access a chain concurrently? If so, this is not supported. You must coordinate access to the chain such that the previous write transaction is submitted before you allocate a new one. Tom On Mon, Mar 6, 2017 at 7:05 AM, Satish Dutt <sd...@advaoptical.com> wrote: > Thanks Robert for the clarification. So to solve the issue, can I handle > this IllegalStateException and retry the read or write operations for a > finite number of times, which makes the best effort of previous > write-capable transactions to get completed. Or is there a more elegant way > of solving this issue ? > > Regards > -Satish > > -Original Message- > From: Robert Varga [mailto:n...@hq.sk] > Sent: Monday, March 06, 2017 5:23 PM > To: Satish Dutt <sd...@advaoptical.com>; controller-users@lists. > opendaylight.org; controller-dev@lists.opendaylight.org > Subject: Re: [controller-dev] Getting exception when using Transaction > Chain > > On 03/06/2017 12:39 PM, Satish Dutt wrote: > > When multiple requests are sent concurrently, IllegalStateException is > > thrown. Is there any way to solve this issue, apart from synchronizing > > the method which does the above operations ? > > This is actually part of the API contract: > > https://github.com/opendaylight/controller/blob/ > a81d98f692b80c45bce3fe6a87e731abfb012a9f/opendaylight/md- > sal/sal-common-api/src/main/java/org/opendaylight/ > controller/md/sal/common/api/data/TransactionChain.java#L59 > > The reason is very simple: if there is a write-capable transaction open > and it has seen some modifications, does the second transaction observe > those modifications as applied or as unapplied? > > Bye, > Robert > > ___ > controller-dev mailing list > controller-dev@lists.opendaylight.org > https://lists.opendaylight.org/mailman/listinfo/controller-dev > ___ controller-dev mailing list controller-dev@lists.opendaylight.org https://lists.opendaylight.org/mailman/listinfo/controller-dev
Re: [controller-dev] Getting exception when using Transaction Chain
On 03/06/2017 01:05 PM, Satish Dutt wrote: > Thanks Robert for the clarification. So to solve the issue, can I handle this > IllegalStateException and retry the read or write operations for a finite > number of times, which makes the best effort of previous write-capable > transactions to get completed. Or is there a more elegant way of solving this > issue ? There is now way you can get around that exception. As for a solution, you have seen https://github.com/opendaylight/controller/blob/a81d98f692b80c45bce3fe6a87e731abfb012a9f/opendaylight/md-sal/sal-common-api/src/main/java/org/opendaylight/controller/md/sal/common/api/data/TransactionChain.java#L92, right? Regards, Robert signature.asc Description: OpenPGP digital signature ___ controller-dev mailing list controller-dev@lists.opendaylight.org https://lists.opendaylight.org/mailman/listinfo/controller-dev
Re: [controller-dev] Getting exception when using Transaction Chain
Thanks Robert for the clarification. So to solve the issue, can I handle this IllegalStateException and retry the read or write operations for a finite number of times, which makes the best effort of previous write-capable transactions to get completed. Or is there a more elegant way of solving this issue ? Regards -Satish -Original Message- From: Robert Varga [mailto:n...@hq.sk] Sent: Monday, March 06, 2017 5:23 PM To: Satish Dutt <sd...@advaoptical.com>; controller-us...@lists.opendaylight.org; controller-dev@lists.opendaylight.org Subject: Re: [controller-dev] Getting exception when using Transaction Chain On 03/06/2017 12:39 PM, Satish Dutt wrote: > When multiple requests are sent concurrently, IllegalStateException is > thrown. Is there any way to solve this issue, apart from synchronizing > the method which does the above operations ? This is actually part of the API contract: https://github.com/opendaylight/controller/blob/a81d98f692b80c45bce3fe6a87e731abfb012a9f/opendaylight/md-sal/sal-common-api/src/main/java/org/opendaylight/controller/md/sal/common/api/data/TransactionChain.java#L59 The reason is very simple: if there is a write-capable transaction open and it has seen some modifications, does the second transaction observe those modifications as applied or as unapplied? Bye, Robert ___ controller-dev mailing list controller-dev@lists.opendaylight.org https://lists.opendaylight.org/mailman/listinfo/controller-dev
Re: [controller-dev] Getting exception when using Transaction Chain
On 03/06/2017 12:39 PM, Satish Dutt wrote: > When multiple requests are sent concurrently, IllegalStateException is > thrown. Is there any way to solve this issue, apart from synchronizing > the method which does the above operations ? This is actually part of the API contract: https://github.com/opendaylight/controller/blob/a81d98f692b80c45bce3fe6a87e731abfb012a9f/opendaylight/md-sal/sal-common-api/src/main/java/org/opendaylight/controller/md/sal/common/api/data/TransactionChain.java#L59 The reason is very simple: if there is a write-capable transaction open and it has seen some modifications, does the second transaction observe those modifications as applied or as unapplied? Bye, Robert signature.asc Description: OpenPGP digital signature ___ controller-dev mailing list controller-dev@lists.opendaylight.org https://lists.opendaylight.org/mailman/listinfo/controller-dev
