Make searchable snapshots cache persistent #66275
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The searchable snapshots cache implemented in 7.10 is not persisted across node restarts, forcing data nodes to download files from the snapshot repository again once the node is restarted. This commit introduces a new Lucene index that is used to store information about cache files. The information about cache files are periodically updated and committed in this index as part of the cache synchronization task added in elastic#64696. When the data node starts the Lucene index is used to load in memory the cache files information; these information are then used to repopulate the searchable snapshots cache with the cache files that exist on disk. Since data nodes can have one or more data paths, this change introduces a Lucene index per data path. Information about cache files are updated in the Lucene index located on the same data path of the cache files.
tlrx
added
>enhancement
:Distributed/Snapshot/Restore
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Pinging @elastic/es-distributed (Team:Distributed) |
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The searchable snapshots cache implemented in 7.10 is
not persisted across node restarts, forcing data nodes to
download files from the snapshot repository again once
the node is restarted.
This commit introduces a new Lucene index that is used
to store information about cache files. The information
about cache files are periodically updated and committed
in this index as part of the cache synchronization task
added in #64696. When the data node starts the Lucene
index is used to load in memory the cache files information;
these information are then used to repopulate the searchable
snapshots cache with the cache files that exist on disk.
Since data nodes can have one or more data paths, this
change introduces a Lucene index per data path. Information
about cache files are updated in the Lucene index located
on the same data path of the cache files.
Backport of #65725 for 7.11