YanQi created HBASE-25645:
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             Summary: Scan use prefix filter someValue case  cause p99 very high
                 Key: HBASE-25645
                 URL: https://issues.apache.org/jira/browse/HBASE-25645
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 2.2.3
            Reporter: YanQi
         Attachments: image-2021-03-08-13-37-40-574.png, 
image-2021-03-08-13-40-06-900.png

There is some thing Wrong with the UseCase:

use client scan API : scan(prefix, null, _caching, new FilterList(new 
PrefixFilter(prefix)));

i find if there is a Space at the prefix end,there may be has a big 
filteredReadRequestCount in the regionserver which has the table region :

!image-2021-03-08-13-37-40-574.png!

so when the request the get P99 may be has a high value:

!image-2021-03-08-13-40-06-900.png!

so i want to know why  a Space at the prefix end can cause this issue



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