Remove sporadic min/max usage estimates from stats #59755
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Today `GET _nodes/stats/fs` includes `{least,most}_usage_estimate`
fields for some nodes. These fields have rather strange semantics. They
are only reported on the elected master and on nodes that have been the
elected master since they were last restarted; when a node stops being
the elected master these stats remain in place but we stop updating them
so they may become arbitrarily stale.
This means that these statistics are pretty meaningless and impossible
to use correctly. Even if they were kept up to date they're never
reported for data-only nodes anyway, despite the fact that data nodes
are the ones where we care most about disk usage. The information needed
to compute the path with the least/most available space is already
provided in the rest the stats output, so we can treat the inclusion of
these stats as a bug and fix it by simply removing them in this commit.
Since these stats were always optional and mostly omitted (for opaque
reasons) this is not considered a breaking change.
DaveCTurner
added
>bug
:Data Management/Stats
Collaborator
|
Pinging @elastic/es-core-features (:Core/Features/Stats) |
elasticmachine
added
the
Team:Data Management
DaveCTurner
commented
Jul 17, 2020
| return current + other; | ||
| } | ||
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| private double addDouble(double current, double other) { |
Contributor
Author
There was a problem hiding this comment.
Unrelated unused method
| return cache.getOrRefresh(); | ||
| } | ||
|
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| private static FsInfo stats(FsProbe probe, FsInfo initialValue, Logger logger, @Nullable ClusterInfo clusterInfo) { |
Contributor
Author
There was a problem hiding this comment.
Unrelated but logger was always the static field so no need to pass it in.
Contributor
Author
|
Thanks Yannick |
DaveCTurner
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DaveCTurner
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Today `GET _nodes/stats/fs` includes `{least,most}_usage_estimate`
fields for some nodes. These fields have rather strange semantics. They
are only reported on the elected master and on nodes that have been the
elected master since they were last restarted; when a node stops being
the elected master these stats remain in place but we stop updating them
so they may become arbitrarily stale.
This means that these statistics are pretty meaningless and impossible
to use correctly. Even if they were kept up to date they're never
reported for data-only nodes anyway, despite the fact that data nodes
are the ones where we care most about disk usage. The information needed
to compute the path with the least/most available space is already
provided in the rest the stats output, so we can treat the inclusion of
these stats as a bug and fix it by simply removing them in this commit.
Since these stats were always optional and mostly omitted (for opaque
reasons) this is not considered a breaking change.
DaveCTurner
added a commit
to DaveCTurner/elasticsearch
that referenced
this pull request
Jul 20, 2020
Adjusts the version logic used for BWC and reinstates the BWC tests
DaveCTurner
added a commit
that referenced
this pull request
Jul 20, 2020
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Today
GET _nodes/stats/fsincludes{least,most}_usage_estimatefields for some nodes. These fields have rather strange semantics. They
are only reported on the elected master and on nodes that have been the
elected master since they were last restarted; when a node stops being
the elected master these stats remain in place but we stop updating them
so they may become arbitrarily stale.
This means that these statistics are pretty meaningless and impossible
to use correctly. Even if they were kept up to date they're never
reported for data-only nodes anyway, despite the fact that data nodes
are the ones where we care most about disk usage. The information needed
to compute the path with the least/most available space is already
provided in the rest the stats output, so we can treat the inclusion of
these stats as a bug and fix it by simply removing them in this commit.
Since these stats were always optional and mostly omitted (for opaque
reasons) this is not considered a breaking change.