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From "Luca Telloli (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-311) Modifications to enable multiple types of logging
Date Fri, 03 Jul 2009 19:03:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12727097#action_12727097
] 

Luca Telloli commented on HDFS-311:
-----------------------------------

To reopen this issue, I'm currently try to solve the following problem. 

For each logging stream I need to set a checkpoint time. This can be done including a setCheckpointTime()
method in the EditLogOutputStream abstract class, but it has a serie of implications, that
I'll list: 

1. at format time we'll need to instantiate a stream of each type to call the method (or we
can make the method static) 

2. for file streams, the method will have to call the FSImage.format(sd) method: this means
that the method should be static or the code should be copied as it is inside the EditLogFileOutputStream


3. FSImage.format static will imply that saveFSImage should be static as well, which implies
that the variable namespaceID should be static as well 

I'm wondering if this is an acceptable solution or not; or I'd like to know if anyone has
a better one. In general I think that some methods of FSImage can be made static without affecting
the thread safety, but I'd like a confirmation on this. 

> Modifications to enable multiple types of logging 
> --------------------------------------------------
>
>                 Key: HDFS-311
>                 URL: https://issues.apache.org/jira/browse/HDFS-311
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Luca Telloli
>         Attachments: HADOOP-5188.patch, HADOOP-5188.patch, HADOOP-5188.patch, HADOOP-5188.patch,
HADOOP-5188.patch, HADOOP-5188.patch, HADOOP-5188.pdf
>
>


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