jackrabbit-oak-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Updated] (OAK-3055) Improve segment cache in SegmentTracker
Date Fri, 11 Dec 2015 11:27:11 GMT

     [ https://issues.apache.org/jira/browse/OAK-3055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dürig updated OAK-3055:
-------------------------------
    Labels: candidate_oak_1_0 candidate_oak_1_2 doc-impacting resilience scalability  (was:
doc-impacting resilience scalability)

> Improve segment cache in SegmentTracker
> ---------------------------------------
>
>                 Key: OAK-3055
>                 URL: https://issues.apache.org/jira/browse/OAK-3055
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segmentmk
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>              Labels: candidate_oak_1_0, candidate_oak_1_2, doc-impacting, resilience,
scalability
>             Fix For: 1.3.3
>
>         Attachments: OAK-3055.patch
>
>
> The hand crafted segment cache in {{SegmentTracker}} is prone to lock contentions in
concurrent access scenarios. As {{SegmentNodeStore#merge}} might also end up acquiring this
lock while holding the commit semaphore the situation can easily lead to many threads being
blocked on the commit semaphore. The {{SegmentTracker}} cache doesn't differentiate between
read and write access, which means that reader threads can block writer threads. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message