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https://issues.apache.org/jira/browse/OAK-1417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13899149#comment-13899149
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Michael Dürig commented on OAK-1417:
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Also with my [latest changes |
https://issues.apache.org/jira/browse/OAK-1413?focusedCommentId=13899140&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13899140]
this test still fails. Although by very little with the segment node store:
{noformat}
quotients: 0.1736829444310801, 0.4644506001846722, 1.1520874751491055,
0.822260569456428, 1.3189926547743966, 1.7104216388225935, 0.987906976744186,
0.7984934086629002, 0.8266509433962265, 0.8787446504992867
bound: 1.4321928094887362, 1.3929025540806694, 1.360160674573947,
1.3324560072990281, 1.3087091496348118, 1.2881285396591575, 1.2701205059304603,
1.2542310644051389, 1.2401071163826312, 1.2274698997309137
{noformat}
Here the first line are the quotients as described in OAK-1413. The second line
is the upper bound for these quotients.
The respective value for the document node store:
{noformat}
quotients: 2.1008669201520913, 0.19547968609735616, 0.1288793422709429,
0.44655172413793104, 4.732303732303732, 0.20288278487897743,
0.9289544235924933, 0.6608946608946609, 80.51310043668123, 12.080081355932203
bound: 1.4321928094887362, 1.3929025540806694, 1.360160674573947,
1.3324560072990281, 1.3087091496348118, 1.2881285396591575,
1.2701205059304603, 1.2542310644051389, 1.2401071163826312, 1.2274698997309137
{noformat}
These values look good generally. Except the last two values which exceed their
bounds by quite some factors (12 and 80!).
> Processing pending observation events does not scale linearly with the number
> of events
> ---------------------------------------------------------------------------------------
>
> Key: OAK-1417
> URL: https://issues.apache.org/jira/browse/OAK-1417
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: mongomk, segmentmk
> Reporter: Michael Dürig
> Attachments:
> 0001-OAK-1417-Processing-pending-observation-events-does-.patch
>
>
> {{org.apache.jackrabbit.oak.jcr.LargeOperationIT#largeNumberOfPendingEvents}}
> does not scale linearly. Neither on a segment nor on a document node store.
> This test asserts that the number of pending observation events (e.g. due to
> a large commit or cluster sync) has a linear processing time. That is the
> time it takes to process one such event is independent of the total number of
> events.
> {code}
> seg quotients: 0.24215928530697586, 0.4065934065934066, 1.7548262548262548,
> 0.6892189218921893, 1.2083000798084598
> doc quotients: 0.2990824434780629, 0.14113885505481122, 0.587378640776699,
> 1.3122130394857667, 142.65850244926523
> {code}
> While in the case of the segment node store the numbers do not seem too
> worrisome, the document node store seems to start lagging behind badly as
> soon as there are more than 32768 pending events.
> See OAK-1413 for how to read those numbers.
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