Add segment sorter for data streams#77261
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mayya-sharipova merged 1 commit intoelastic:7.xfrom Sep 3, 2021
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It is beneficial to sort segments within a datastream's index by desc order of their max timestamp field, so that the most recent (in terms of timestamp) segments will be first. This allows to speed up sort query on @timestamp desc field, which is the most common type of query for datastreams, as we are mostly concerned with the recent data. This patch addressed this for writable indices. Segments' sorter is different from index sorting. An index sorter by itself is concerned about the order of docs within an individual segment (and not how the segments are organized), while the segment sorter is only used during search and allows to start docs collection with the "right" segment, so we can terminate the collection faster. This PR adds a property to IndexShard `isDataStreamIndex` that shows if a shard is a part of datastream.
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jkakavas
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It is beneficial to sort segments within a datastream's index
by desc order of their max timestamp field, so
that the most recent (in terms of timestamp) segments
will be first.
This allows to speed up sort query on @timestamp desc field,
which is the most common type of query for datastreams,
as we are mostly concerned with the recent data.
This patch addressed this for writable indices.
Segments' sorter is different from index sorting.
An index sorter by itself is concerned about the order of docs
within an individual segment (and not how the segments are organized),
while the segment sorter is only used during search and allows
to start docs collection with the "right" segment,
so we can terminate the collection faster.
This PR adds a property to IndexShard
isDataStreamIndexthatshows if a shard is a part of datastream.
Backport for #75195