Hi Mostafa, I'd suggest to narrow down why that lease update failed, esp if you have it reproducible. By default a lease is updated every 10 seconds and is valid for 2min (and could in theory be changed but that's not recommended necessarily).
Besides mentioned DB issues, other cases where lease updates failed were JVMs running low on memory thus doing too long GC-stop-the-worlds. If you can rule out both, then here's some more ideas to investigate: a) check for warnings in the form of: "BackgroundLeaseUpdate.execute: time since last renewClusterIdLease() call longer than expected" to see if the lease update became slow already before it finally expired. Perhaps that gives some clues already. b) enable trace logging for 'org.apache.jackrabbit.oak.plugins.document.ClusterNodeInfo' to see all details about lease updates happening (or not). c) analyse thread dumps to rule out blocked lease update thread Cheers, Stefan On 01/08/17 15:45, "Mostafa Mahdieh" <[email protected]> wrote: >Hi, > >I'm using jackrabbit oak as the content repository of a document >management >system product. Currently there is no need to scale out, therefore I'm >using jackrabbit oak in a single node environment. However, I'm >experiencing issues related to clustering and lease time, such as the >following exception which is appearing all over my tomcat logs: > >WARN: Background operation failed: >org.apache.jackrabbit.oak.plugins.document.DocumentStoreException: This >oak >instance failed to update the lease in time and can therefore no longer >access this DocumentNodeStore. > >After some research, It seems that there is no way to use jackrabbit oak >forcing it to use a single node and not having any concerns related to >clustering. > >Am I using the right tool? I thought maybe jackrabbit 2 might be better >for >my current use case, however oak seemed as the future of jackrabbit, and >attracted me (adding scalability is also in my future vision). Do you >suggest oak for my usecase or jackrabbit 2? How can I adapt oak for a >single node environment without getting issues regarding lease time and >clustering? > >Best Regards >-- >Mostafa Mahdieh
