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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15677) FailedServerException shouldn't clear MetaCache
Date Tue, 19 Apr 2016 09:55:25 GMT
Mikhail Antonov created HBASE-15677:

             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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