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Fix it, then Ship it!




The patch looks good. I'd like to see a better log message to avoid users 
pinging Sentry for these kind of errors.


sentry-service/sentry-service-server/src/main/java/org/apache/sentry/service/thrift/SentryHMSClient.java
Lines 250 (patched)
<https://reviews.apache.org/r/67912/#comment289016>

    is there something the user can do when a snapshot fails?
    
    Btw, we should be more clear on the message. Let's specificily mention the 
HMS snapshot and the possible cause of it, like a HMS service restart? 
Something that help the user understand this is not or might not be a Sentry 
error. Otherwise users will ask Sentry what's up with that error. Could this be 
a warning instead?


- Sergio Pena


On July 13, 2018, 5:36 p.m., kalyan kumar kalvagadda wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/67912/
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> 
> (Updated July 13, 2018, 5:36 p.m.)
> 
> 
> Review request for sentry, Alexander Kolbasov, Arjun Mishra, Na Li, and 
> Sergio Pena.
> 
> 
> Bugs: SENTRY-2310
>     https://issues.apache.org/jira/browse/SENTRY-2310
> 
> 
> Repository: sentry
> 
> 
> Description
> -------
> 
> If the communication between sentry and HMS goes down for any reason while 
> sentry is fetching full update from HMS, SentryHMSClient in HMSFollower would 
> be left with a reference to closed socket. As sentry is not handling the 
> failure and closing the SentryHMSClient, it continues using the same 
> SentryHMSClient. This will result in "java.net.SocketException: Broken pipe" 
> as the client tries to write on socket that is closed.
> 
> Fix: Close the SentryHMSClient when there is an exception. Drawback with this 
> approach is that we need to make sure that this is done when ever new API's 
> are added to SentryHMSClient.
> 
> 
> Diffs
> -----
> 
>   
> sentry-service/sentry-service-server/src/main/java/org/apache/sentry/service/thrift/SentryHMSClient.java
>  9d1a92f185ab9ddf5efa8f1b51ff054cf2cfbcd3 
> 
> 
> Diff: https://reviews.apache.org/r/67912/diff/1/
> 
> 
> Testing
> -------
> 
> Made sure that all the existing tests passed.
> 
> 
> Thanks,
> 
> kalyan kumar kalvagadda
> 
>

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