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https://issues.apache.org/jira/browse/HBASE-26192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17835603#comment-17835603
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Hudson commented on HBASE-26192:
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Results for branch branch-2
[build #1028 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2/1028/]:
(x) *{color:red}-1 overall{color}*
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(/) {color:green}+1 general checks{color}
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(/) {color:green}+1 source release artifact{color}
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(/) {color:green}+1 client integration test{color}
> Master UI hbck should provide a JSON formatted output option
> ------------------------------------------------------------
>
> Key: HBASE-26192
> URL: https://issues.apache.org/jira/browse/HBASE-26192
> Project: HBase
> Issue Type: New Feature
> Reporter: Andrew Kyle Purtell
> Assignee: Mihir Monani
> Priority: Minor
> Labels: pull-request-available
> Fix For: 2.7.0, 3.0.0-beta-2, 2.6.1, 2.5.9
>
> Attachments: HBCK Report in JSON Format.png, Screen Shot 2022-05-31
> at 5.18.15 PM.png
>
>
> It used to be possible to get hbck's verdict of cluster status from the
> command line, especially useful for headless deployments, i.e. without
> requiring a browser with sufficient connectivity to load a UI, or scrape
> information out of raw HTML, or write regex to comb over log4j output. The
> hbck tool's output wasn't particularly convenient to parse but it was
> straightforward to extract the desired information with a handful of regular
> expressions.
> HBCK2 has a different design philosophy than the old hbck, which is to serve
> as a collection of small and discrete recovery and repair functions, rather
> than attempt to be a universal repair tool. This makes a lot of sense and
> isn't the issue at hand. Unfortunately the old hbck's utility for reporting
> the current cluster health assessment has not been replaced either in whole
> or in part. Instead:
> {quote}
> HBCK2 is for fixes. For listings of inconsistencies or blockages in the
> running cluster, you go elsewhere, to the logs and UI of the running cluster
> Master. Once an issue has been identified, you use the HBCK2 tool to ask the
> Master to effect fixes or to skip-over bad state. Asking the Master to make
> the fixes rather than try and effect the repair locally in a fix-it tool's
> context is another important difference between HBCK2 and hbck1.
> {quote}
> Developing custom tooling to mine logs and scrape UI simply to gain a top
> level assessment of system health is unsatisfying. There should be a
> convenient means for querying the system if issues that rise to the level of
> _inconsistency_, in the hbck parlance, are believed to be present. It would
> be relatively simple to bring back the experience of invoking a command line
> tool to deliver a verdict. This could be added to the hbck2 tool itself but
> given that hbase-operator-tools is a separate project an intrinsic solution
> is desirable.
> An option that immediately comes to mind is modification of the Master's
> hbck.jsp page to provide a JSON formatted output option if the HTTP Accept
> header asks for text/json. However, looking at the source of hbck.jsp, it
> makes more sense to leave it as is and implement a convenient machine
> parseable output format elsewhere. This can be trivially accomplished with a
> new servlet. Like hbck.jsp the servlet implementation would get a reference
> to HbckChore and present the information this class makes available via its
> various getters.
> The machine parseable output is sufficient to enable headless hbck status
> checking but it still would be nice if we could provide operators a command
> line tool that formats the information for convenient viewing in a terminal.
> That part could be implemented in the hbck2 tool after this proposal is
> implemented.
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