[
https://issues.apache.org/jira/browse/HDFS-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028097#comment-13028097
]
Eli Collins commented on HDFS-1799:
-----------------------------------
Separating out the concerns per these three classes makes sense to me. Aside
from the usefulness of the abstraction, trying to maintain the invariant that
EditLogOutputStream is a small delta (eg sync'ing) wrt OutputStream and not
wanting to pile more code into FSEditLog necessitates a new class. When it
comes to the edits log we should be optimizing for simplicity (therefore
correctness) rather than # classes etc. If JournalManager evolves towards
Journal as articulated in HDFS-1850, that's fine.
These are implementation classes, we can get something that works well for 1073
and then modify as necessary for 1850.
@Todd, I'll post detailed review feedback on your latest patch tomorrow.
> Refactor log rolling and filename management out of FSEditLog
> -------------------------------------------------------------
>
> Key: HDFS-1799
> URL: https://issues.apache.org/jira/browse/HDFS-1799
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: Edit log branch (HDFS-1073)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: Edit log branch (HDFS-1073)
>
> Attachments: 0001-Added-state-management-to-FSEditLog.patch,
> 0002-Standardised-error-pattern.patch,
> 0003-Add-JournalFactory-and-move-divert-revert-out-of-FSE.patch,
> HDFS-1799-all.diff, hdfs-1799.txt, hdfs-1799.txt, hdfs-1799.txt, hdfs-1799.txt
>
>
> This is somewhat similar to HDFS-1580, but less ambitious. While that JIRA
> focuses on pluggability, this task is simply the minimum needed for HDFS-1073:
> - Refactor the filename-specific code for rolling, diverting, and reverting
> log streams out of FSEditLog into a new class
> - Clean up the related code in FSEditLog a bit
> Notably, this JIRA is going to temporarily break the BackupNode. I plan to
> circle back on the BackupNode later on this branch.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
