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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5348) Create a stable wire format for exceptions
Date Tue, 05 May 2009 14:12:30 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706035#action_12706035

Steve Loughran commented on HADOOP-5348:

Maybe the term "wire format" is wrong; I should retitle this. Its about a stable Writable
for exceptions that doesn't rely on the far end to have every exception in the Java chain.
Rather than serialise the throwable and hope the far end has its classpath in perfect sync,
right down to JDBC drivers, this turns the exception chain into a chain of ThrowableWritables,
which can then be written and read.

We could add Avro support to this when the time comes. 

> Create a stable wire format for exceptions
> ------------------------------------------
>                 Key: HADOOP-5348
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5348
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: ipc
>    Affects Versions: 0.21.0
>            Reporter: Steve Loughran
>             Fix For: 0.21.0
>         Attachments: hadoop-5348.patch, ThrowableWritable.java
> HADOOP-5201 and other issues would benefit from a stable representation of exceptions,
one that can be sent over the network, maybe pushed out to web UIs and which we can be 100%
sure that the far end will be able to handle if they have the hadoop-core JAR on their classpath.

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