Íñigo Goiri commented on HDFS-12773:

Thanks, [~linyiqun] for the comments. Uploaded [^HDFS-12773.007.patch]  with 
your comments.

A good way should update now() to monotonicNow() both in 
StateStoreFileBaseImpl#putAll and StateStoreFileBaseImpl#isOldTempRecord, 
instead of reverting that one.
The problem is the synchronization across Routers.
Imagine Router 1, is writing the membership record and sets {{monotonicNow()}}, 
while this is happening, Router 2, comes and checks that time, as 
{{monotonicNow()}} is not universal, the values they will get are not 

> RBF: Improve State Store FS implementation
> ------------------------------------------
>                 Key: HDFS-12773
>                 URL: https://issues.apache.org/jira/browse/HDFS-12773
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Assignee: Íñigo Goiri
>            Priority: Major
>         Attachments: HDFS-12773.000.patch, HDFS-12773.001.patch, 
> HDFS-12773.002.patch, HDFS-12773.003.patch, HDFS-12773.004.patch, 
> HDFS-12773.005.patch, HDFS-12773.006.patch
> HDFS-10630 introduced a filesystem implementation of the State Store for unit 
> tests. However, this implementation doesn't handle multiple writers 
> concurrently.

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