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From "Cao Manh Dat (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-12338) Replay buffering tlog in parallel
Date Fri, 18 May 2018 03:15:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-12338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16480078#comment-16480078
] 

Cao Manh Dat commented on SOLR-12338:
-------------------------------------

[~yseeley@gmail.com] The need to order things come from how we currently handle reordered
in-place updates. Currently, if a replica receives in-place update u2 which point to in-place
update u1 which does not arrive yet, the replica will fetch the full document from the leader.
This is a very costly/risky logic to handle reordered updates (ie: what if there are no leader
to ask for the full document). Luckily for us that reorder is not a common case right now,
but if we replay updates in a parallel and non-order way, above case can happen much more
frequently. Therefore In my opinion, it should be avoided. 

> Replay buffering tlog in parallel
> ---------------------------------
>
>                 Key: SOLR-12338
>                 URL: https://issues.apache.org/jira/browse/SOLR-12338
>             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-12338.patch, SOLR-12338.patch, SOLR-12338.patch
>
>
> Since updates with different id are independent, therefore it is safe to replay them
in parallel. This will significantly reduce recovering time of replicas in high load indexing
environment. 



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