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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10881) Federation State Store Driver API
Date Tue, 28 Mar 2017 23:45:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15946228#comment-15946228

Chris Douglas commented on HDFS-10881:

* If the create/mod time needs to be set, can it at least use the same timestamp? That call
can be expensive
* If {{remove(T)}} is called on a record that isn't in the state store, is the result successful?
Please update the javadoc
* If an implementation should maintain invariant properties (atomicity, idempotence, etc.)
for these calls, it might be worth calling those out. For example, if {{putAll}} fails partway
through, should the state store guarantee rollback, or does the client just skip collisions?
I don't know if the annotations added in HDFS-4974 are still used, or apply to the state store
implementations this supports.
** The API is very generic. In context with the implementation, it may be possible to simplify
* Walking the type hierarchy in {{StateStoreUtils#getRecordClass}} by classname is unfortunate.
Since it'd be cross-cutting across subsequent patches we can revisit it later.

+1 for committing to the branch

> Federation State Store Driver API
> ---------------------------------
>                 Key: HDFS-10881
>                 URL: https://issues.apache.org/jira/browse/HDFS-10881
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: fs
>            Reporter: Jason Kace
>            Assignee: Jason Kace
>         Attachments: HDFS-10881-HDFS-10467-001.patch, HDFS-10881-HDFS-10467-002.patch,
HDFS-10881-HDFS-10467-003.patch, HDFS-10881-HDFS-10467-004.patch, HDFS-10881-HDFS-10467-005.patch,
HDFS-10881-HDFS-10467-006.patch, HDFS-10881-HDFS-10467-007.patch, HDFS-10881-HDFS-10467-008.patch,
HDFS-10881-HDFS-10467-009.patch, HDFS-10881-HDFS-10467-010.patch, HDFS-10881-HDFS-10467-011.patch,
> The API interfaces and minimal classes required to support a state store data backend
such as ZooKeeper or a file system.

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