Improve shards evictions in searchable snapshot cache service#67519
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tlrx merged 1 commit intoelastic:7.11from Jan 14, 2021
Merged
Improve shards evictions in searchable snapshot cache service#67519tlrx merged 1 commit intoelastic:7.11from
tlrx merged 1 commit intoelastic:7.11from
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…c#67160) The searchable snapshot's cache service is notified when cache files of a specific shard must be evicted. The notifications are usually done in a cluster state applier thread that calls the CacheService# markShardAsEvictedInCache method. The markShardAsEvictedInCache adds the shard to an internal set of ShardEviction and submits the eviction of the shard to the generic thread pool. Because there's nothing preventing the cache service (and persistent cache service) to be closed before all shared evictions are processed, it is possible that invalidating a cache file fails and trips an assertion (as it happened in many tests failures recently elastic#66958, elastic#66730). This commit changes the CacheService so that it now waits for the evictions of shards to complete before closing the cache and persistent cache services.
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The searchable snapshot's cache service is notified when cache files
of a specific shard must be evicted. The notifications are usually done
in a cluster state applier thread that calls the CacheService#
markShardAsEvictedInCache method.
The markShardAsEvictedInCache adds the shard to an internal set
of ShardEviction and submits the eviction of the shard to the generic
thread pool. Because there's nothing preventing the cache service
(and persistent cache service) to be closed before all shared evictions
are processed, it is possible that invalidating a cache file fails and trips
an assertion (as it happened in many tests failures recently #66958, #66730).
This commit changes the CacheService so that it now waits for the evictions
of shards to complete before closing the cache and persistent cache services.
Backport of #67160 for 7.11.1