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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Updated] (OAK-7852) Blocked background flush can cause sever data loss
Date Fri, 19 Oct 2018 09:31:03 GMT

     [ https://issues.apache.org/jira/browse/OAK-7852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dürig updated OAK-7852:
-------------------------------
    Summary: Blocked background flush can cause sever data loss   (was: Blocked backfround
flush can cause sever data loss)

> Blocked background flush can cause sever data loss 
> ---------------------------------------------------
>
>                 Key: OAK-7852
>                 URL: https://issues.apache.org/jira/browse/OAK-7852
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segment-tar
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>            Priority: Major
>             Fix For: 1.10
>
>
> When the {{FileStore background task}} fails (e.g. because of a deadlock) and the {{FileStore}}
is subsequently shutdown in an unclean way ({{kill -9}}) then there is a risk of a sever data
loss. Although a journal could be reconstructed from the segments, there is a chance that
most if not all of the revisions written since the failure of the background tasks are inconsistent
with a {{SNFE}}. 
> The expectation for such a case should be that a journal could be reconstructed from
the segments and that all but the last few revisions are consistent.



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