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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5937) Refactor HLog into an interface.
Date Sun, 30 Sep 2012 23:16:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466591#comment-13466591

stack commented on HBASE-5937:

How is HLogSplitter going to work w/ different implementations?  Currently you punt and refer
to FSHLog?

This too seems like an HLog thing rather than something that belongs out in util:


When region server opens, it'll want to ask the HLog implementation how to read back its edits?
 Not go to util?

FYI in hbase, like hadoop, we're about two spaces for indent (See HLogMetrics)

Yeah, whats this crazy thing supposed to do?  {code} resetLogReaderClass{code}

Factory looks like it needs a get reader for my edits and you pass in the region whose edits
you want?

FYI, next time, you could use Bytes.toBytes in HBase  under util to do this: "HBASE::CACHEFLUSH".getBytes(HConstants.UTF8_ENCODING);

The following from HLogUtil I'd think belong in an implementation:

getReader // Why this in util and in factory too? .... or, its commented out along w/ createWriter?
getRegionDirRecoveredEditsDir // Can do this later... seems like I ask the implementation
for reader on the edits... 
getSplitEditFilesSorted // Yeah, this would be in the HLog splitting implementation... or
not exposed at all

No problem if you want to address the above later

Something is up w/ your pom-it in the patch.  You are removing its contents.

So, what you want to do?  If tests pass and you are fairly sure you have not done anything
to change our wal write speed -- it doesn't look like you have changed any of that, then if
you want to do a part 1 commit and then open new issue to address outstanding, improving WAL
Interface, etc., I'd be +1 on that.

> Refactor HLog into an interface.
> --------------------------------
>                 Key: HBASE-5937
>                 URL: https://issues.apache.org/jira/browse/HBASE-5937
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Li Pi
>            Assignee: Flavio Junqueira
>            Priority: Minor
>         Attachments: 5937-hlog-with-javadoc.txt, HBASE-5937.patch, HBASE-5937.patch,
HBASE-5937.patch, HBASE-5937.patch, HBASE-5937.patch, org.apache.hadoop.hbase.client.TestMultiParallel-output.txt
> What the summary says. Create HLog interface. Make current implementation use it.

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