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https://issues.apache.org/jira/browse/HBASE-6950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gregory Chanan updated HBASE-6950:
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Status: Patch Available (was: Open)
> TestAcidGuarantees system test now flushes too aggressively
> -----------------------------------------------------------
>
> Key: HBASE-6950
> URL: https://issues.apache.org/jira/browse/HBASE-6950
> Project: HBase
> Issue Type: Bug
> Components: test
> Affects Versions: 0.92.2, 0.94.2, 0.96.0
> Reporter: Gregory Chanan
> Assignee: Gregory Chanan
> Priority: Minor
> Fix For: 0.96.0
>
> Attachments: HBASE-6950.patch
>
>
> HBASE-6552 caused the TestAcidGuarantees system test to flush more
> aggressively, because flushes are where ACID problems have occurred in the
> past.
> After some more cluster testing, it seems like this too aggressive; my
> clusters eventually can't keep up with the number of flushes/compactions and
> start getting SocketTimeoutExceptions. We could try to optimize the
> flushes/compactions, but since this workload would never occur in practice, I
> don't think it is worth the effort. Instead, let's just only flush once a
> minute. This is arbitrary, but seems to work.
> Here is my comment in the (upcoming) patch:
> {code}
> // Flushing has been a source of ACID violations previously (see HBASE-2856),
> so ideally,
> // we would flush as often as possible. On a running cluster, this isn't
> practical:
> // (1) we will cause a lot of load due to all the flushing and compacting
> // (2) we cannot change the flushing/compacting related Configuration options
> to try to
> // alleviate this
> // (3) it is an unrealistic workload, since no one would actually flush that
> often.
> // Therefore, let's flush every minute to have more flushes than usual, but
> not overload
> // the running cluster.
> {code}
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