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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14215) DynamoDB client should waitForActive on existing tables
Date Wed, 05 Apr 2017 21:35:43 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mingliang Liu updated HADOOP-14215:
-----------------------------------
    Attachment: HADOOP-14215-HADOOP-13345.001.patch

The v1 patch adds a simple retry logic for getting the item of version marker, which may be
created by another thread/process.

> DynamoDB client should waitForActive on existing tables
> -------------------------------------------------------
>
>                 Key: HADOOP-14215
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14215
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Sean Mackrory
>            Assignee: Sean Mackrory
>         Attachments: HADOOP-14215-HADOOP-13345.000.patch, HADOOP-14215-HADOOP-13345.001.patch
>
>
> I saw a case where 2 separate applications tried to use the same non-pre-existing table
with table.create = true at about the same time. One failed with a ResourceInUse exception.
If a table does not exist, we attempt to create it and then wait for it to enter the active
state. If another jumps in in the middle of that, the table may exist, thus bypassing our
call to waitForActive(), and then try to use the table immediately.
> While we're at it, let's also make sure that the race condition where a table might get
created between checking if it exists and attempting to create it is handled gracefully.



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