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https://issues.apache.org/jira/browse/SOLR-9922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15798322#comment-15798322
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Mark Miller commented on SOLR-9922:
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bq. In my opinion, in case of HDFSUpdateLog we should store buffer tlog in
local file system, because these files have very short life and small.
-1, When you have a single shared filesystem, you really don't want to start
splitting data management across distrib and a local filesystem as much as
possible. Buffered data is not necessarily short lived, clusters that start
with a high rate of incoming documents and many different other factors can
make cases where these files are long lived and can take a lot of space. Much
of the appeal of hdfs is managing space for large storage requirements from a
single front rather than a single front plus each node.
[[email protected]] should really weigh in on this idea of splitting up the
tlog.
> 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
> Attachments: 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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