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From "Gwen Shapira (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KAFKA-4876) WindowStore.fetch(key, 0, Long.MaxValue) is very slow
Date Fri, 07 Apr 2017 21:45:42 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-4876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gwen Shapira updated KAFKA-4876:
--------------------------------
    Fix Version/s:     (was: 0.10.2.1)

> WindowStore.fetch(key, 0, Long.MaxValue) is very slow
> -----------------------------------------------------
>
>                 Key: KAFKA-4876
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4876
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.10.1.0, 0.10.2.0
>            Reporter: Xavier Léauté
>
> Relates to KAFKA-4851
> Querying a window store over the entire time range (i.e. {{\[0, Long.MAX_VALUE\]}} is
extremely slow.
> Here's a simple benchmark that shows it takes about 400ms to query just a single key
with a timestamp as of today's date.
> https://github.com/xvrl/kafka/commit/045b94d4c70d730d10ed492efeb0fd85a70757ae#diff-46a87bcb14bccc04c8ad716a043fc78eR150
> {code}
> Benchmark                                    Mode  Cnt    Score    Error   Units
> RocksDBWindowStoreTest.benchmarkStoreFetch   avgt   20  401.635 ± 46.130   ms/op
> {code}
> Using timestamps far out in the future (e.g. 0x7a00000000000000L) the fetch operation
essentially never completes.



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