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https://issues.apache.org/jira/browse/HDFS-13399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434729#comment-16434729
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Erik Krogen commented on HDFS-13399:
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{quote}
Just to make sure we are on the same page. Hadoop requires backward
compatibility for minor releases. So please NO breaking! As I look at it we
cannot break compatibility ever: we can only add new methods, parameters, etc.
and deprecate old ones.
Package-private is not a part of API, so it can change.
{quote}
This is not generally correct. While it is true for Public/Stable interfaces,
it is not for Evolving interfaces. Please see the published [Hadoop
compatibility
guidelines|https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/InterfaceClassification.html#Evolving]:
{quote}
Evolving
An Evolving interface is typically exposed so that users or external code can
make use of a feature before it has stabilized. The expectation that an
interface should “eventually” stabilize and be promoted to Stable, however, is
not a requirement for the interface to be labeled as Evolving.
Incompatible changes are allowed for Evolving interface only at minor releases.
Incompatible changes allowed: minor (x.Y.0) Compatible changes allowed:
maintenance (x.y.Z)
{quote}
> Make Client field AlignmentContext non-static.
> ----------------------------------------------
>
> Key: HDFS-13399
> URL: https://issues.apache.org/jira/browse/HDFS-13399
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: HDFS-12943
> Reporter: Plamen Jeliazkov
> Assignee: Plamen Jeliazkov
> Priority: Major
> Attachments: HDFS-13399-HDFS-12943.000.patch,
> HDFS-13399-HDFS-12943.001.patch
>
>
> In HDFS-12977, DFSClient's constructor was altered to make use of a new
> static method in Client that allowed one to set an AlignmentContext. This
> work is to remove that static field and make each DFSClient pass it's
> AlignmentContext down to the proxy Call level.
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