Plz review.

Whilst looking into DEC code I found out that our whole ExeMgr to PrimProc State Machine is fragile, e.g. I was tinkering with iptables blocks trying to emulate custom network outages. There was a case when ExeMgr got into a infinity blocking read from the socket awaiting for magic whilst the network traffic was blackholed. I didn't come up with an appropriate solution.

I'm not entirely sure what the patch was for or if it corrects a problem QA can replicate & test. Roman could you advise Daniel how to test this?

Yes, instructions or any info would be great. Thx

Ehhm. It doesn't look easily testable now. Here is the reciept though.

• Setup two 1.5 single-nodes(nodes A and B)
• Shut A and B down.
• Take a config from a 1.4 two-node cluster and replace 1.5 configs at A and B with the config. You need to replace 1.4 nodes IPs with IPs of A and B. Where A's IP must get into DBRM_Controller.IpAddr
• place files "module", one with pm1 and another with pm2 into each /var/lib/columnstore/local
• Start A and B. Test that SELECT works.
• Shutdown secondary node B. Wait a minute. Now the cluster must fail SELECT queries.
• Start node B. Test that SELECT works.

drrtuy, i am afraid Daniel cannot do it in that manner. We will first get Jose's procs.

I will attempt to do it myself, though. Are the package in build 153 ready, do they include this thing?

OK, I had a limited success with this - not exactly as written, but seems close (SELECTS work after PM2 shutdown, but CRUDs don't, and start working upon restart).

To make it work I had to inject poor man's synchronization (PM1 and PM2 waiting on each other exemgrs, and on PM1's controllernode (8616) to open. Columnstore.xml was hand-crafted (compring one node to two nodes).

I did the end-to-end: docker build, start containers, push two-node .xml to both, push appropriate modules to both; called start-columnstore on both.

Lowlights: I still cannot make it start up for local storage for some reason (this is S3). Also, something going funky on initialization, I had to restart both in order to make them talk to each other.

But good so far.