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From Jørgen Løland (JIRA) <j...@apache.org>
Subject [jira] Commented: (DERBY-3064) Implement the LogShipper that will enable the shipping of Log records from the master to the slave
Date Fri, 28 Sep 2007 07:57:50 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12530938

Jørgen Løland commented on DERBY-3064:

If I understand you correctly, you are asking two questions: 

Q1. Should LogShipper throw all exceptions to MasterController even in cases where it can
do something meaningful with it?

Q2. Should the LogShipper wrap exceptions in StandardExceptions before throwing them to MasterController.

A1. As a general rule of thumb when it comes to exceptions, I think you need to decide whether
or not your code can do anything about it or if it needs to be handled by code at a higher
level. If your code can handle it, you may fix the problem and not throw the exception further
(in this case from LogShipper to MasterController).

A2. I don't think you should wrap an exception in a StandardException at any lower level than
MasterController; let the controller decide which exceptions are fatal and which can be handled.
That is easier to do with the original exception at hand than with a StandardException.

Of course, nothing but StandardException should be seen outside the replication package, so
MasterController has to wrap before throwing.

As I see it, your alternatives are not mutually exclusive. I think you can actually do a little
bit of alternative 1) and a little bit of alternative 2) :-D 

> Implement the LogShipper that will enable the shipping of Log records from the master
to the slave
> --------------------------------------------------------------------------------------------------
>                 Key: DERBY-3064
>                 URL: https://issues.apache.org/jira/browse/DERBY-3064
>             Project: Derby
>          Issue Type: Sub-task
>            Reporter: V.Narayanan
>            Assignee: V.Narayanan
>         Attachments: LogShipperImpl_v1.diff, LogShipperImpl_v1.stat, LogShipperImpl_v2.diff,

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