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] [Commented] (OAK-1497) JackrabbitEvent#isExternal() returns true for internal changes for slow listeners
Date Wed, 05 Mar 2014 09:18:45 GMT

    [ https://issues.apache.org/jira/browse/OAK-1497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13920685#comment-13920685
] 

Michael Dürig commented on OAK-1497:
------------------------------------

bq. 5. change the batching behavior...
This would mean giving up on a scalability goal we set ourselves while at the same time only
pushing out the limit a bit further. As soon as the queue fills up we either go OOM or we
kill the listener. 

bq. 6. persist-on-overflow...
FTR we hand something along these lines with OAK-775 and got into all sorts of troubles. E.g.
because each listener would have to maintain its own persisted queue of events. 

> JackrabbitEvent#isExternal() returns true for internal changes for slow listeners
> ---------------------------------------------------------------------------------
>
>                 Key: OAK-1497
>                 URL: https://issues.apache.org/jira/browse/OAK-1497
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>            Reporter: Michael Dürig
>             Fix For: 0.18
>
>
> Oak degrades gracefully for observation listeners that can't keep up with the rate of
observation events fired. See {{BackgroundObserver#contentChanged}} for the gory details.

> As a side effect {{JackrabbitEvent#isExternal}} will always return {{true}} when this
degradation happens. However there is currently no way for clients to detect this and to thus
know whether the result of {{JackrabbitEvent#isExternal}} is reliable or not. 



--
This message was sent by Atlassian JIRA
(v6.2#6252)

Mime
View raw message