Zach York created HBASE-18587:
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             Summary: Fix Flaky TestFileIOEngine
                 Key: HBASE-18587
                 URL: https://issues.apache.org/jira/browse/HBASE-18587
             Project: HBase
          Issue Type: Bug
          Components: BucketCache, test
            Reporter: Zach York
            Assignee: Zach York


As a part of HBASE-18533, the Jenkins report said that TestFileIOEngine failed. 
I investigated and noticed that there are two cases where this test is flaky:
len = 0 and offset 0; it will fail for 
https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/FileIOEngine.java#L198
 will pass in -1 for offset which is invalid.
len = 0 and i = 13; it will try to specify an offset of the totalCapacity which 
is not allowed.
 
This patch fixes this test.



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