RFA warm standby parameters

can someone tell me if my RFA warm standby parameters are set up correctly?

\Logger\AppLogger\useInternalLogStrings                      = true
\Logger\AppLogger\fileLoggerEnabled                          = false

\Connections\Connection_RSSL\connectionType                 = "RSSL"
\Connections\Connection_RSSL\traceMsgToFile                 = false
\Connections\Connection_RSSL\rsslPort                       = "Port"
\Connections\Connection_RSSL\serverList                     = "WarmStandbyGroup"
\StandbyLists\WarmStandbyGroup\serverList                   = "IPAddress1,IPAddress2, IPAddress3"

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Accepted answers

Jirapongse

Yes, the configurations look correct.

If ADS servers support warm standby, RFA will connect to all servers in the serverList. You can verify the server support from the login refresh in RSSL tracing. The value of SupportStandby must be one.

<refreshMsg domainType="RSSL_DMT_LOGIN" streamId="1" containerType="RSSL_DT_NO_DATA" ...>
    <key  flags="0x26 (RSSL_MKF_HAS_NAME|RSSL_MKF_HAS_NAME_TYPE|RSSL_MKF_HAS_ATTRIB)"  ...>
        <attrib>
            <elementList flags="0x8 (RSSL_ELF_HAS_STANDARD_DATA)">
          ...
                <elementEntry name="SupportStandby" dataType="RSSL_DT_UINT" data="1"/>
...
            </elementList>
        </attrib>
    </key>
    <dataBody>
    </dataBody>
</refreshMsg>

With WarmStandby, one is designated as an active server and
the rest are standby servers. RFA will internally request the same items from both active and
standby servers.

The consumer application receives updates only on the item streams opened on the active server; it does not get
updates, status, unsolicited refreshes, and generic messages from the standby server(s). If the active server fails, RFA
notifies one of the standby servers that it is the new active server. That server then begins sending data without the
consumer application needing to re-request the items.

For more information, please refer to 16.2 Warm Standby in RFA Developers Guide.

All comments

derek.li2

If my application gets disconnect by IPAdress1, will RFA lib automatically switch over to IPAddress2 without my application code doing anything?

Jirapongse

Yes, the configurations look correct.

<refreshMsg domainType="RSSL_DMT_LOGIN" streamId="1" containerType="RSSL_DT_NO_DATA" ...>
    <key  flags="0x26 (RSSL_MKF_HAS_NAME|RSSL_MKF_HAS_NAME_TYPE|RSSL_MKF_HAS_ATTRIB)"  ...>
        <attrib>
            <elementList flags="0x8 (RSSL_ELF_HAS_STANDARD_DATA)">
          ...
                <elementEntry name="SupportStandby" dataType="RSSL_DT_UINT" data="1"/>
...
            </elementList>
        </attrib>
    </key>
    <dataBody>
    </dataBody>
</refreshMsg>

With WarmStandby, one is designated as an active server and
the rest are standby servers. RFA will internally request the same items from both active and
standby servers.

For more information, please refer to 16.2 Warm Standby in RFA Developers Guide.

derek.li2

Is there a simple c++ consumer example which handles failover(with on warm standby) ?

Jirapongse

RFA uses session to manage the connections. The RFA application can't directly manage the connections. The connections can be disconnected by releasing the session and then reconnected by acquiring a new session. However, this method will increase the complexity of the application.

If you would like to directly manage the connections, I suggest to use other APIs, such as UPA or EMA.

Zuka1

How about RFA/Java? I configured startingActiveServer for primary and serverList for Standby. I am seeing user mount(connection) to primary and standby ADSs but OpenItens only count up on primary ADS. standby keeps "0" OpenItems.

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