Viraj Jasani created HADOOP-18740:
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Summary: s3a prefetch cache blocks should be accessed by RW locks
Key: HADOOP-18740
URL: https://issues.apache.org/jira/browse/HADOOP-18740
Project: Hadoop Common
Issue Type: Sub-task
Reporter: Viraj Jasani
Assignee: Viraj Jasani
In order to implement LRU or LFU based cache removal policies for s3a
prefetched cache blocks, it is important for all cache reader threads to
acquire read lock and similarly cache file removal mechanism (fs close or cache
eviction) to acquire write lock before accessing the files.
As we maintain the block entries in an in-memory map, we should be able to
introduce read-write lock per cache file entry, we don't need coarse-grained
lock shared by all entries.
This is a prerequisite to HADOOP-18291.
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