[jira] [Created] (HBASE-15677) FailedServerException shouldn't clear MetaCache

["Mikhail Antonov (JIRA)" <ji...@apache.org>]

Mikhail Antonov created HBASE-15677:
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             Summary: FailedServerException shouldn't clear MetaCache
                 Key: HBASE-15677
                 URL: https://issues.apache.org/jira/browse/HBASE-15677
             Project: HBase
          Issue Type: Sub-task
          Components: Client
    Affects Versions: 1.3.0
            Reporter: Mikhail Antonov
            Assignee: Mikhail Antonov
             Fix For: 1.3.0


Right now FailedServerException clears meta cache. Seems like it's unnecessary (if we hit that, someone has already gotten some network/remote error in the first place and invalidated located cache for us), and seems it could lead to unnecessary drops, as FailedServers cache has default TTL of 2 seconds, so we can encounter situation like this:

 - thread T1 hit network error and cleared the cache, put server in failed server list
 - thread T2 tries to get it's request in and gets FailedServerException
 - thread T1 does meta scan to populate the cache
 - thread T2 clears the cache after it's got FSE.



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