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https://issues.apache.org/jira/browse/HBASE-13144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-13144.
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Resolution: Won't Fix
> Avoid writing files to disk in unit tests
> -----------------------------------------
>
> Key: HBASE-13144
> URL: https://issues.apache.org/jira/browse/HBASE-13144
> Project: HBase
> Issue Type: Test
> Reporter: Andrew Kyle Purtell
> Priority: Major
>
> We have a number of unit tests that read and write relatively small files,
> but do it often and run under a timeout clock. If the build or test host is
> virtual or IO contended or both then the test can become flaky. Even if the
> host is up to the IO pressure the test would run a lot faster if we were not
> asking the OS to persist anything. Consider both:
> - If built against Hadoop 2.6+, spin up miniclusters that keep all blocks in
> memory-only storage
> - Write a simple Hadoop filesystem implementation (or find one) that keeps
> all state in memory and use in lieu of LocalFileSystem for unit tests.
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