simbadzina opened a new pull request, #5142:
URL: https://github.com/apache/hadoop/pull/5142
HDFS-16845: Adds configuration flag to allow clients to use router observer
reads without using the ObserverReadProxyProvider.
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### Description of PR
Description
In order for clients to have routers forward their reads to observers, the
clients must use a proxy with an alignment context. This is currently achieved
by using the ObserverReadProxyProvider.
Using ObserverReadProxyProvider allows backward compatible for client
configurations.
However, the ObserverReadProxyProvider forces an msync on initialization
which is not required with routers.
Performing msync calls is more expensive with routers because the router
fans out the cal to all namespace, so we'd like to avoid this.
### How was this patch tested?
New test cases in TestObserverWithRouter.
### For code changes:
- [ x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
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