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Posted to dev@lucene.apache.org by "Cao Manh Dat (JIRA)" <ji...@apache.org> on 2018/06/01 02:47:00 UTC
[jira] [Commented] (SOLR-9922) Write buffering updates to another
tlog
[ https://issues.apache.org/jira/browse/SOLR-9922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16497491#comment-16497491 ]
Cao Manh Dat commented on SOLR-9922:
------------------------------------
Attached a patch for this ticket which can be applied on the master branch. This issue is required for SOLR-12305.
> Write buffering updates to another tlog
> ---------------------------------------
>
> Key: SOLR-9922
> URL: https://issues.apache.org/jira/browse/SOLR-9922
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Cao Manh Dat
> Assignee: Cao Manh Dat
> Priority: Major
> Attachments: SOLR-9922.patch, SOLR-9922.patch, SOLR-9922.patch, SOLR-9922.patch, SOLR-9922.patch
>
>
> Currently, we write buffering logs to current tlog and not apply that updates to index. Then we rely on replay log to apply that updates to index. But at the same time there are some updates also write to current tlog and applied to the index.
> For example, during peersync, if new updates come to replica we will end up with this tlog
> tlog : old1, new1, new2, old2, new3, old3
> old updates belong to peersync, and these updates are applied to the index.
> new updates belong to buffering updates, and these updates are not applied to the index.
> But writing all the updates to same current tlog make code base very complex. We should write buffering updates to another tlog file.
> By doing this, it will help our code base simpler. It also makes replica recovery for SOLR-9835 more easier. Because after peersync success we can copy new updates from temporary file to current tlog, for example
> tlog : old1, old2, old3
> temporary tlog : new1, new2, new3
> -->
> tlog : old1, old2, old3, new1, new2, new3
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