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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Updated] (OAK-3329) TarMK cleanup blocks writers
Date Tue, 22 Sep 2015 12:32:04 GMT

     [ https://issues.apache.org/jira/browse/OAK-3329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Michael Dürig updated OAK-3329:
    Attachment: OAK-3329.patch

Proposed patch: [^OAK-3329.patch].

This patch takes the cleanup of the individual readers outside of the lock allowing for concurrent
writes during that time. All tests pass. Tests regarding impact on concurrent writers are

[~alex.parvulescu], please have a look.

> TarMK cleanup blocks writers
> ----------------------------
>                 Key: OAK-3329
>                 URL: https://issues.apache.org/jira/browse/OAK-3329
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segmentmk
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>              Labels: cleanup, gc
>             Fix For: 1.3.7
>         Attachments: OAK-3329.patch
> TarMK cleanup exclusively locks the {{FileStore}}, which causes concurrent writers to
block until cleanup finished. Initially cleanup was expected to be reasonably fast, however
I have seen it taking dozens of minutes under certain circumstances (most likely many tar
files with many small segments, aka OAK-2896).

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