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https://issues.apache.org/jira/browse/YARN-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15342439#comment-15342439
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Joep Rottinghuis commented on YARN-5281:
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[~kasha] raised a good point to focus on ensuring that we eliminate as many
entry barriers as possible. I understand the concern about having to support a
separate HBase installation for small Hadoop clusters. It isn't ideal if people
have to become an HBase expert before using Yarn. I can open a separate jira to
ship a dead-simple configuration where all needed processes for HBase can be
launched on a single machine (perhaps by default where the user chooses to run
the RM process). This would probably depend on YARN-5045.
As [~varun_saxena] pointed out, we did start with trying to maintain both HBase
and file-based implementation. As the features progressed and became more
sophisticated it became increasingly more difficult to maintain feature parity,
which is why we ultimately decided to move the file-based implementation to be
for testing only.
[~ozawa] highlighted the desire to have a simple implementation on HDFS. As I
imagine what that would look like, especially to serve reads, filters and
queries one would end up with what would essentially be a mini-HBase
implementation.
We've separately discussed a potential solution to spool writes to disk for
if/when HBase is temporarily unavailable. We can see if that can be used to
serve some use-cases to test out the API for writes.
> Explore supporting a simpler back-end implementation for ATS v2
> ---------------------------------------------------------------
>
> Key: YARN-5281
> URL: https://issues.apache.org/jira/browse/YARN-5281
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Affects Versions: YARN-2928
> Reporter: Joep Rottinghuis
>
> During the merge discussion [~kasha] raised the question whether we would
> support simpler backend for users to try out, in addition to the HBase
> implementation.
> The understanding is that this would not be meant to scale, but it could
> simplify initial adoption and early usage.
> I'm filing this jira to gather the merits and challenges of such approach in
> one place.
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