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https://issues.apache.org/jira/browse/HADOOP-13649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15625054#comment-15625054
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Steve Loughran commented on HADOOP-13649:
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One thing to consider is that the local store is just a cache, and so Guava's
com.google.common.cache.Cache class may be the place to start coding
> s3guard: implement time-based (TTL) expiry for LocalMetadataStore
> -----------------------------------------------------------------
>
> Key: HADOOP-13649
> URL: https://issues.apache.org/jira/browse/HADOOP-13649
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Reporter: Aaron Fabbri
> Assignee: Aaron Fabbri
>
> LocalMetadataStore is primarily a reference implementation for testing. It
> may be useful in narrow circumstances where the workload can tolerate
> short-term lack of inter-node consistency: Being in-memory, one JVM/node's
> LocalMetadataStore will not see another node's changes to the underlying
> filesystem.
> To put a bound on the time during which this inconsistency may occur, we
> should implement time-based (a.k.a. Time To Live / TTL) expiration for
> LocalMetadataStore
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