[jira] [Created] (OAK-6884) TarMK disk space check is not synchronized with FileStore opened state

["Arek Kita (JIRA)" <ji...@apache.org>]

Arek Kita created OAK-6884:
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             Summary: TarMK disk space check is not synchronized with FileStore opened state
                 Key: OAK-6884
                 URL: https://issues.apache.org/jira/browse/OAK-6884
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: segment-tar, upgrade
    Affects Versions: 1.7.9
            Reporter: Arek Kita
            Priority: Minor
             Fix For: 1.8


It seems that the disk space check is not properly synchronized with {{FileStore}} as I revealed a race condition while using oak-upgrade during migration to {{segment-tar}}.

The {{FileStore}} instance is closed while TarMK disk check tries to execute and it seems it is dependent on the state of segment ({{org.apache.jackrabbit.oak.segment.file.FileStore.checkDiskSpace(FileStore.java:541)}} that needs to be opened. 

{noformat}
30.10.2017 11:26:05.834 WARN   o.a.j.o.s.f.Scheduler: The scheduler FileStore background tasks takes too long to shut down
30.10.2017 11:26:11.674 INFO   o.a.j.o.s.f.FileStore: TarMK closed: /data/cq/crx-quickstart/repository-segment-tar-20171030-112401/segmentstore
30.10.2017 11:26:11.676 ERROR  o.a.j.o.s.f.SafeRunnable: Uncaught exception in TarMK disk space check [/data/cq/crx-quickstart/repository-segment-tar-20171030-112401/segmentstore]
java.lang.IllegalStateException: already shut down
    at org.apache.jackrabbit.oak.segment.file.ShutDown.keepAlive(ShutDown.java:42)
    at org.apache.jackrabbit.oak.segment.file.FileStore.size(FileStore.java:302)
    at org.apache.jackrabbit.oak.segment.file.FileStore.checkDiskSpace(FileStore.java:541)
    at org.apache.jackrabbit.oak.segment.file.FileStore.access$300(FileStore.java:102)
    at org.apache.jackrabbit.oak.segment.file.FileStore$3.run(FileStore.java:237)
    at org.apache.jackrabbit.oak.segment.file.SafeRunnable.run(SafeRunnable.java:67)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
{noformat}



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