You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@activemq.apache.org by VenuGopal Thati <ve...@gmail.com> on 2021/05/26 21:21:57 UTC
KahaDB version in ActiveMQ 5.15.11 vs 5.16.2
Hi,
While upgrading from ActiveMQ version 5.15.11 to 5.16.2, there is a log
line that says KahaDB version is 6 but when I downgraded back to 5.15.11,
log line printed as KahaDB version is 7. Are these versions related to the
state of the database because of upgrades ? Or the actual KahaDB ? If it's
actual KahaDB, I am wondering why the version is going down in the new
version of ActiveMQ.
I looked into the source code link below, it's reading this version value
from java.io.DataInput but I couldn't figure out whether it's the actual
database version. Thanks for your help.
https://github.com/apache/activemq/blob/ccb1050af9d1ecd5dbd18c4d8df33fdf10cc84dd/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L179
--
Regards,
Venu.
Re: KahaDB version in ActiveMQ 5.15.11 vs 5.16.2
Posted by Matt Pavlovich <ma...@gmail.com>.
Yes, moving forward upgrades should be safe. Note— it is always best to fully drain when you can!
I suggest in production:
1. Shutdown the prod instance.
2. Copy the data over to a separate system.
3. Start up the upgraded broker and verify queue and message counts.
4. Upon success of 1-3, then perform the actual upgrade on the prod server (copy the data from 5.15.11 to the 5.16.2 installation, so you have a rollback without having to worry about downgrade)
There is always a risk of duplication in messaging when you do upgrades without-a-drain, but I think that is safer than risking data corruption. (ie power goes out during the upgrade)
Thanks,
-Matt Pavlovich
> On May 26, 2021, at 4:51 PM, VenuGopal Thati <ve...@gmail.com> wrote:
>
> Yes, there was some test data I left out in the data directory to see if
> the upgrade goes through. Is it ok to do the upgrade with the data on the
> disk ? Sorry, I haven't done the upgrade before. Thanks for your quick
> response.
>
> On Wed, May 26, 2021 at 5:40 PM Matt Pavlovich <ma...@gmail.com> wrote:
>
>> It is the version of the KahaDB format on-disk. Did you perform the
>> upgrade with previous data?
>>
>> I suspect you saw 5.16.2 load previous files from 5.15.11 (version 6) and
>> then create new files with version 7.
>>
>> 5.15.x version 6 ref:
>> https://github.com/apache/activemq/blob/activemq-5.15.15/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L140
>> <
>> https://github.com/apache/activemq/blob/activemq-5.15.15/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L140
>>>
>> 5.16.x version 7 ref:
>> https://github.com/apache/activemq/blob/activemq-5.16.x/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L139
>> <
>> https://github.com/apache/activemq/blob/activemq-5.16.x/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L139
>>>
>>
>> -Matt Pavlovich
>>
>>> On May 26, 2021, at 4:21 PM, VenuGopal Thati <ve...@gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> While upgrading from ActiveMQ version 5.15.11 to 5.16.2, there is a log
>>> line that says KahaDB version is 6 but when I downgraded back to 5.15.11,
>>> log line printed as KahaDB version is 7. Are these versions related to
>> the
>>> state of the database because of upgrades ? Or the actual KahaDB ? If
>> it's
>>> actual KahaDB, I am wondering why the version is going down in the new
>>> version of ActiveMQ.
>>>
>>> I looked into the source code link below, it's reading this version value
>>> from java.io.DataInput but I couldn't figure out whether it's the actual
>>> database version. Thanks for your help.
>>>
>>>
>> https://github.com/apache/activemq/blob/ccb1050af9d1ecd5dbd18c4d8df33fdf10cc84dd/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L179
>>>
>>>
>>> --
>>> Regards,
>>> Venu.
>>
>>
>
> --
> Regards,
> Venu.
Re: KahaDB version in ActiveMQ 5.15.11 vs 5.16.2
Posted by VenuGopal Thati <ve...@gmail.com>.
Yes, there was some test data I left out in the data directory to see if
the upgrade goes through. Is it ok to do the upgrade with the data on the
disk ? Sorry, I haven't done the upgrade before. Thanks for your quick
response.
On Wed, May 26, 2021 at 5:40 PM Matt Pavlovich <ma...@gmail.com> wrote:
> It is the version of the KahaDB format on-disk. Did you perform the
> upgrade with previous data?
>
> I suspect you saw 5.16.2 load previous files from 5.15.11 (version 6) and
> then create new files with version 7.
>
> 5.15.x version 6 ref:
> https://github.com/apache/activemq/blob/activemq-5.15.15/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L140
> <
> https://github.com/apache/activemq/blob/activemq-5.15.15/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L140
> >
> 5.16.x version 7 ref:
> https://github.com/apache/activemq/blob/activemq-5.16.x/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L139
> <
> https://github.com/apache/activemq/blob/activemq-5.16.x/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L139
> >
>
> -Matt Pavlovich
>
> > On May 26, 2021, at 4:21 PM, VenuGopal Thati <ve...@gmail.com> wrote:
> >
> > Hi,
> >
> > While upgrading from ActiveMQ version 5.15.11 to 5.16.2, there is a log
> > line that says KahaDB version is 6 but when I downgraded back to 5.15.11,
> > log line printed as KahaDB version is 7. Are these versions related to
> the
> > state of the database because of upgrades ? Or the actual KahaDB ? If
> it's
> > actual KahaDB, I am wondering why the version is going down in the new
> > version of ActiveMQ.
> >
> > I looked into the source code link below, it's reading this version value
> > from java.io.DataInput but I couldn't figure out whether it's the actual
> > database version. Thanks for your help.
> >
> >
> https://github.com/apache/activemq/blob/ccb1050af9d1ecd5dbd18c4d8df33fdf10cc84dd/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L179
> >
> >
> > --
> > Regards,
> > Venu.
>
>
--
Regards,
Venu.
Re: KahaDB version in ActiveMQ 5.15.11 vs 5.16.2
Posted by Matt Pavlovich <ma...@gmail.com>.
It is the version of the KahaDB format on-disk. Did you perform the upgrade with previous data?
I suspect you saw 5.16.2 load previous files from 5.15.11 (version 6) and then create new files with version 7.
5.15.x version 6 ref: https://github.com/apache/activemq/blob/activemq-5.15.15/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L140 <https://github.com/apache/activemq/blob/activemq-5.15.15/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L140>
5.16.x version 7 ref: https://github.com/apache/activemq/blob/activemq-5.16.x/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L139 <https://github.com/apache/activemq/blob/activemq-5.16.x/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L139>
-Matt Pavlovich
> On May 26, 2021, at 4:21 PM, VenuGopal Thati <ve...@gmail.com> wrote:
>
> Hi,
>
> While upgrading from ActiveMQ version 5.15.11 to 5.16.2, there is a log
> line that says KahaDB version is 6 but when I downgraded back to 5.15.11,
> log line printed as KahaDB version is 7. Are these versions related to the
> state of the database because of upgrades ? Or the actual KahaDB ? If it's
> actual KahaDB, I am wondering why the version is going down in the new
> version of ActiveMQ.
>
> I looked into the source code link below, it's reading this version value
> from java.io.DataInput but I couldn't figure out whether it's the actual
> database version. Thanks for your help.
>
> https://github.com/apache/activemq/blob/ccb1050af9d1ecd5dbd18c4d8df33fdf10cc84dd/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java#L179
>
>
> --
> Regards,
> Venu.