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https://issues.apache.org/jira/browse/HADOOP-5224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674454#action_12674454
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Nigel Daley commented on HADOOP-5224:
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{quote}
Hi folks, please pardon me for re-opening this issue. I am wondering if there
is a better way to disable "appends" for 0.19.1 We coudld set the config
parameter dfs.support.append to false in hadoop-defaults.xml. This means that a
default installation of hadoop will not support "appends". However, for people
that are testing their apps (not in production), it gives them an easy way to
test their apps.
{quote}
Dhruba, folks who want to test with append can use 0.19.0.
{quote}
There could be big-and-large warning message associated with the
dfs.support.append parameter warning people to the fact that there could be
data corruption if they set that flag to true.
{quote}
The uploaded patch creates a dfs.support.append config entry but doesn't seem
to use it in the append method to affect it's behavior. What am I missing?
{quote}
I am re-opening this issue because I am not sure whether this approach was
considered. If it was considered and was shot down, please let me know why and
u can close this issue.
{quote}
I think this should be a new Jira that could be fixed in 0.19.2. If you agree,
please close this and open a new Jira.
> Disable append
> --------------
>
> Key: HADOOP-5224
> URL: https://issues.apache.org/jira/browse/HADOOP-5224
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs, libhdfs
> Affects Versions: 0.19.0
> Reporter: Nigel Daley
> Priority: Blocker
> Fix For: 0.19.1
>
> Attachments: disableAppend.patch, HADOOP-5224.patch
>
>
> As discussed on core-dev@
> (http://www.nabble.com/Hadoop-0.19.1-td21739202.html) we will disable append
> API in Hadoop 0.19.1 by throwing UnsupportedOperationException from
> FileSystem.append(...) methods.
> Does append in libhdfs (HADOOP-4494) need attention too?
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