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jenoudet approved these changes Apr 26, 2023
elega approved these changes Apr 28, 2023
| return lockManager -> new RocksInodeStore(baseDir); | ||
| } else { | ||
| return lockManager -> new CachingInodeStore(new RocksInodeStore(baseDir), lockManager); | ||
| if (Configuration.getBoolean(PropertyKey.MASTER_METASTORE_INODE_CACHE_BASIC)) { |
elega reviewed Apr 28, 2023
| + "or when individual directories contain large numbers of files.") | ||
| .setConsistencyCheckLevel(ConsistencyCheckLevel.ENFORCE) | ||
| .setScope(Scope.MASTER) | ||
| .build(); |
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also update line 2689 correspondingly
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This adds an alternative inode/edge cache that only stores inodes.
It can be enabled using
alluxio.master.metastore.inode.cache.basicIt is recommended to be used when the master has either limited memory or when directories have large number of files, as the current inode cache must load all edges for a directory in memory.
Caching the inodes is advantageous as they are large objects with expensive serialization/ deserialization, while the edges are only made up of a string (the name) and a long (the id) and are thus faster to load from RocksDB.
Using this cache appears to have a 5-10% slowdown in performing GetStatus operations, but can also improve the performance greatly when the system is under load as there will be less cache thrashing on directories and less long GC pauses.