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Add periodic flush count to flush stats #29360

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merged 4 commits into from
Apr 11, 2018

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dnhatn
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@dnhatn dnhatn commented Apr 4, 2018

Currently, a flush stats contains only the total flush which is the sum
of manual flush (via API) and periodic flush (async triggered when the
uncommitted translog size is exceeded the flush threshold). Sometimes,
it's useful to know these two numbers independently. This commit tracks
and returns the periodic flush count in a flush stats.

Relates #29125

Currently, a flush stats contains only the total flush which is the sum
of manual flush (via API) and periodic flush (async triggered when the
uncommitted translog size is exceeded the flush threshold). Sometimes,
it's useful to know these two numbers independently. This commit tracks
and returns a periodic flush count in a flush stats.
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Pinging @elastic/es-core-infra

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@@ -85,6 +96,7 @@ public TimeValue getTotalTime() {
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(Fields.FLUSH);
builder.field(Fields.TOTAL, total);
builder.field(Fields.PERIODIC, periodic);
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can we have a rest test that checks that this is there?

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@s1monw
I had a test but I could not verify the periodic value as the periodic flush is executed async. Do you have any suggestion for this? Or just check its presence (eg. 0 is ok)?

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I used the analogue of gt: { periodic: 0} when I did something similar.

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Thanks @DaveCTurner. Unfortunately, sometimes a period flush might still be executing (or just scheduled) and periodic is still 0.

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@DaveCTurner DaveCTurner Apr 4, 2018

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Apologies, I meant gte: { periodic: 0 }

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yeah ++

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I will go this suggestion. Thanks @DaveCTurner and @s1monw.

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dnhatn commented Apr 4, 2018

@s1monw I've added a rest test. Can you please have another look? Thank you!

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LGTM

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dnhatn commented Apr 11, 2018

Thanks @s1monw and @DaveCTurner.

@dnhatn dnhatn merged commit 4e6a890 into elastic:master Apr 11, 2018
@dnhatn dnhatn deleted the periodic-flushstats branch April 11, 2018 15:15
dnhatn added a commit that referenced this pull request Apr 11, 2018
Currently, a flush stats contains only the total flush which is the sum
of manual flush (via API) and periodic flush (async triggered when the
uncommitted translog size is exceeded the flush threshold). Sometimes,
it's useful to know these two numbers independently. This commit tracks
and returns a periodic flush count in a flush stats.
dnhatn added a commit that referenced this pull request Apr 11, 2018
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5 participants