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From "Amit Jain (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (OAK-4837) Improved caching for DataStore
Date Thu, 01 Dec 2016 04:55:58 GMT

     [ https://issues.apache.org/jira/browse/OAK-4837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amit Jain reopened OAK-4837:
----------------------------

> Improved caching for DataStore
> ------------------------------
>
>                 Key: OAK-4837
>                 URL: https://issues.apache.org/jira/browse/OAK-4837
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: blob
>            Reporter: Amit Jain
>            Assignee: Amit Jain
>              Labels: performance
>             Fix For: 1.6
>
>         Attachments: FileReadBenchmark.png, FileReadBenchmark_0Cache.png, FileWriteBenchmark.png
>
>
> The current CachingDataStore implementation used with S3DataStore has certain problems:
> * Lack of stats to show hit rate/miss rates for files being requested for downloads
> * Lack of stats for async uploads
> * CachingDataStore starts proactively downloading files in the background when a call
to {{getRecord}} is made.
> * Async upload functionality leaks into Backend implementations, LocalCache classes.
> * The call to {{DataStore#getRecord()}} which makes multiple calls to backends which
is problematic for S3 (i.e. when not being served bu cache)
> * There is some functionality which is not used with Oak like length cache, sync/async
touch etc. which can be removed and code simplified.



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