Igniters,

I’ve been working on the documentation for the Persistent Store fixing Java Doc 
in parallel:
https://apacheignite.readme.io/v2.0/docs/distributed-persistent-store 
<https://apacheignite.readme.io/v2.0/docs/distributed-persistent-store>

However, there are several configuration parameters of 
PersistentStoreConfiguration that don’t make sense to me:
* PersistentStoreConfiguration.setLockWaitTime
* PersistentStoreConfiguration.setWalHistorySize
* PersistentStoreConfiguration.setWalArchivePath (here I can get what this 
"Full WAL segments will be copied to this directory before reuse.” means to me 
as to the end user)

Alex G., as the store architect, please document those methods so that the 
users can understand what are they for and when they should be used. Also it 
will be great if you look through the rest of the parameters.

Finally, I do remember there was a way to do the writes to the store in async 
or sync mode but I can’t find any parameter to tweak the behavior. Is there any 
other configuration API I’m not aware of?

—
Denis



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