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https://issues.apache.org/jira/browse/HDFS-6326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14001354#comment-14001354
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Tsz Wo Nicholas Sze commented on HDFS-6326:
-------------------------------------------
> I can't think of a workaround to the problem of brittle Writable
> serialization. ...
We could check if the ACL bit is set in the permission field of FileStatus. I.e.
{code}
//FileStatus
@Override
public void write(DataOutput out) throws IOException {
Text.writeString(out, getPath().toString(), Text.DEFAULT_MAX_LEN);
out.writeLong(getLen());
out.writeBoolean(isDirectory());
out.writeShort(getReplication());
out.writeLong(getBlockSize());
out.writeLong(getModificationTime());
out.writeLong(getAccessTime());
getPermission().write(out);
Text.writeString(out, getOwner(), Text.DEFAULT_MAX_LEN);
Text.writeString(out, getGroup(), Text.DEFAULT_MAX_LEN);
out.writeBoolean(isSymlink());
if (isSymlink()) {
Text.writeString(out, getSymlink().toString(), Text.DEFAULT_MAX_LEN);
}
if (permission.getAclBit()) {
//write ACL
...
}
}
@Override
public void readFields(DataInput in) throws IOException {
String strPath = Text.readString(in, Text.DEFAULT_MAX_LEN);
this.path = new Path(strPath);
this.length = in.readLong();
this.isdir = in.readBoolean();
this.block_replication = in.readShort();
blocksize = in.readLong();
modification_time = in.readLong();
access_time = in.readLong();
permission.readFields(in);
owner = Text.readString(in, Text.DEFAULT_MAX_LEN);
group = Text.readString(in, Text.DEFAULT_MAX_LEN);
if (in.readBoolean()) {
this.symlink = new Path(Text.readString(in, Text.DEFAULT_MAX_LEN));
} else {
this.symlink = null;
}
if (permission.getAclBit()) {
//read ACL
...
}
}
{code}
> WebHdfs ACL compatibility is broken
> -----------------------------------
>
> Key: HDFS-6326
> URL: https://issues.apache.org/jira/browse/HDFS-6326
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Affects Versions: 3.0.0, 2.4.0
> Reporter: Daryn Sharp
> Assignee: Chris Nauroth
> Priority: Blocker
> Fix For: 3.0.0, 2.4.1
>
> Attachments: HDFS-6326-branch-2.4.patch, HDFS-6326.1.patch,
> HDFS-6326.2.patch, HDFS-6326.3.patch, HDFS-6326.4.patch, HDFS-6326.5.patch,
> HDFS-6326.6.patch, aclfsperm.example
>
>
> 2.4 ACL support is completely incompatible with <2.4 webhdfs servers. The NN
> throws an {{IllegalArgumentException}} exception.
> {code}
> hadoop fs -ls webhdfs://nn/
> Found 21 items
> ls: Invalid value for webhdfs parameter "op": No enum constant
> org.apache.hadoop.hdfs.web.resources.GetOpParam.Op.GETACLSTATUS
> [... 20 more times...]
> {code}
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