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From "Eugene Koifman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-13014) RetryingMetaStoreClient is retrying too aggresievley
Date Wed, 18 Jan 2017 18:55:26 GMT

     [ https://issues.apache.org/jira/browse/HIVE-13014?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eugene Koifman updated HIVE-13014:
----------------------------------
    Attachment: HIVE-13014.06.patch

> RetryingMetaStoreClient is retrying too aggresievley
> ----------------------------------------------------
>
>                 Key: HIVE-13014
>                 URL: https://issues.apache.org/jira/browse/HIVE-13014
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore, Transactions
>    Affects Versions: 1.0.0
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Critical
>         Attachments: HIVE-13014.01.patch, HIVE-13014.02.patch, HIVE-13014.03.patch, HIVE-13014.04.patch,
HIVE-13014.05.patch, HIVE-13014.06.patch
>
>
> Not all metastore operations are idempotent.  For example, commit_txn() consists of 
> 1. request from client to server
> 2. server action
> 3. ack to client
> If network connection is broken after (or during) 2 but before 3 happens, RetryingMetastoreClient
will retry the operation thus causing an attempt to commit the same txn twice (sometimes in
concurrently)
> The 2nd attempt is guaranteed to fail and thus return an error to the caller (which doesn't
know the operation is being retried), while the first attempt has actually succeeded.  Thus
the caller thinks commit failed and will likely attempt to redo the transactions - not what
we want in most cases.



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