Unable to open markfile with version 0

[pgrange]

After upgrading aeron, I suddenly can't open mark-files generated by the cluster.

aeron-cluster-mark-codecs version has been downgraded from 1 to 0 in this commit: 3cdafbd

We can see this version 0 here: https://github.com/real-logic/aeron/blob/master/aeron-cluster/src/main/resources/aeron-cluster-mark-codecs.xml#L5

Now, when I try to open a mark-file generated by aeron using ClusterMarkFile I get this exception:

java.lang.IllegalStateException: Mark file is created but not initialised
	at org.agrona.MarkFile.mapExistingMarkFile(MarkFile.java:420)
	at org.agrona.MarkFile.<init>(MarkFile.java:180)
	at io.aeron.cluster.service.ClusterMarkFile.<init>(ClusterMarkFile.java:142)
	at Status.openMarkFile(Status.java:224)
	at Status.healthyness(Status.java:158)
	at Status.isHealthy(Status.java:131)
	at Status.main(Status.java:117)

This seems to be directly related to agrona considering that 0, as a version, is its null value and considers it an error:
https://github.com/real-logic/agrona/blob/master/agrona/src/main/java/org/agrona/MarkFile.java#L533

[BodySplash]

That means also, that most commands in io.aeron.cluster.ClusterTool are not working.

I guess an easy solution would be to change codecs version from 0 to 1, but I'm not sure what would be the impact.

[ZachBray]

FYI this seems to surface when using the ClusterTool but not when running a cluster node. Whilst they both construct ClusterMarkFiles they do so using different constructors. Only the ClusterTool ends up executing MarkFile.mapExistingMarkFile(...) which contains this check that the version is not 0.

[mjpt777]

The use of SBE schema version and mark file version have been conflated by mistake. We'll look at how to address this and give priority in the solution to those with a support contract.

[mjpt777]

Fixed with this commit. d3fc6b7