RHQ Data Storage

[arun2arunraj]

Hi Developers,

    I have installed Agent and Server in my own Machine for studying RHQ. Now I created a plugin which will put random values as a metric. But No Idea where my data are stored in Postgresql.

    I got Metric elements data are stored in POSTGRESQL ( traits, trends-up, calltime ). I found table names which holds measured values. But I could not find my plugins value in that table.

    Shortly says, I want to know about RHQ Data Storage Machanism. I read this topic https://docs.jboss.org/author/display/RHQ/Monitoring. But I need more, about the background mechanism of RHQ.

Regards,

ArunRaj

[mazz]

This is the current mechanism of storing metrics in the RBDMS (Postgres or Oracle):

https://docs.jboss.org/author/display/RHQ/Measurement+Subsystem

Design and implementation is underway to change this - for more information on the new NoSQL mechanism that will be used to store metrics in the near future, see:

https://docs.jboss.org/author/display/RHQ/Next+Generation+Metrics+Storage

https://docs.jboss.org/author/display/RHQ/Cassandra+Back+End+Design+Notes

[arun2arunraj]

Hi John,

    Thanks for your link. It is simple and precise.

    Now I understood Server side Data Storage Mechanism of RHQ. But This topic leads me to ask this question. Sorry, If I am annoying you. Please help me to understand RHQ. 

    What is the data storage mechanism used in Agent Side while collecting data from resources? ? ?. I understand, It just collects data from metrics. But My Question is If it collects data, It has to store those data until it delivers to the RHQ Server. Please clarrify my doubt ! ! !

Regards,

ArunRaj

[mazz]

If all servers are down, and the agent can't send measurements for storage on the server, the agent will spool the measurement messages until a server does come back up.

See this: https://docs.jboss.org/author/display/RHQ/Agent+Features#AgentFeatures-GuaranteedDelivery

[arun2arunraj]

Hi John,

     Thanks again for your awesome material. Is there any notes to study about "metric collection system".

Regards,

ArunRaj

[arun2arunraj]

Hi John,

    Can I get that raw table rotation algortithm. I need it, Because, I want to check the collects metrics with that table. I am having complete RHQ 4.6.0. But having no idea where that algortithm has been implemented ! ! !

Regards,

ArunRaj.

[tsegismont]

Arun,

You may have a look at MeasurementDataManagerUtility class. Checkout the source code: https://docs.jboss.org/author/display/RHQ/Building+RHQ#BuildingRHQ-CheckoutRHQSources

Thomas

[mazz]

You actually should not have to care at all about how the rotation algorithm is implemented. It "just works". Users should just provide the database, RHQ will create the schema and will manage those measurement tables under the covers with no user interaction or knowledge. So, I would not worry about it. Since you are new to RHQ, I would not bog down on these technical details that users don't need to know - concentrate on learning the GUI user interface.

[arun2arunraj]

Hi Thomas,

    Thanks for the class. It is exactly what I have asked. Thank you so much for this again. I have asked it to know, " How you guys have coded to store the measured values ? " Now I have undetstand it. Thanks a lot again.

Regards,

ArunRaj

[arun2arunraj]

Hi John,

    Thanks for your guidance. I will take it up and push myself forward. I am not only new to RHQ and also to JAVA. That is why I have wanted to know the coding structure. And Thanks again for guiding me in the perfect path.

Regards,

ArunRaj