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