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https://issues.apache.org/jira/browse/HADOOP-3485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12611808#action_12611808
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Pete Wyckoff commented on HADOOP-3485:
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FUSE/Java FileOutputStream is causing the close to happen right after the
create. I don't know which. Here's the output from fuse running in debug mode:
[junit] unique: 1, opcode: INIT (26), nodeid: 0, insize: 56
[junit] INIT: 7.8
[junit] flags=0x00000003
[junit] max_readahead=0x00020000
[junit] INIT: 7.8
[junit] flags=0x00000001
[junit] max_readahead=0x00020000
[junit] max_write=0x00020000
[junit] unique: 1, error: 0 (Success), outsize: 40
[junit] unique: 2, opcode: LOOKUP (1), nodeid: 1, insize: 50
[junit] LOOKUP /hello.txt
[junit] unique: 2, error: -2 (No such file or directory), outsize: 16
[junit] unique: 3, opcode: MKNOD (8), nodeid: 1, insize: 58
[junit] MKNOD /hello.txt
[junit] in dfs_create! NODEID: 2
[junit] dfs_release unique: 3, error: 0 (Success), outsize: 136
[junit] unique: 4, opcode: OPEN (14), nodeid: 2, insize: 48
[junit] unique: 4, error: 0 (Success), outsize: 32
[junit] OPEN[12151664] flags: 0x8401 /hello.txt
[junit] unique: 5, opcode: WRITE (16), nodeid: 2, insize: 75
[junit] WRITE[12151664] 11 bytes to 0
[junit] WRITE[12151664] 11 bytes
[junit] unique: 5, error: 0 (Success), outsize: 24
[junit] unique: 6, opcode: FLUSH (25), nodeid: 2, insize: 64
[junit] FLUSH[12151664]
[junit] unique: 6, error: 0 (Success), outsize: 16
[junit] unique: 7, opcode: RELEASE (18), nodeid: 2, insize: 64
[junit] RELEASE[12151664] flags: 0x8401
And here's the java code creating the file:
// create the file
File file = new File(mpoint, "hello.txt");
FileOutputStream f = new FileOutputStream(file);
String s = "hello world";
f.write(s.getBytes());
f.flush();
f.close();
> implement writes
> ----------------
>
> Key: HADOOP-3485
> URL: https://issues.apache.org/jira/browse/HADOOP-3485
> Project: Hadoop Core
> Issue Type: New Feature
> Components: contrib/fuse-dfs
> Reporter: Pete Wyckoff
> Priority: Minor
> Attachments: patch1.txt
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> Doesn't support writes because fuse protocol first creates the file then
> closes it and re-opens it to start writing to it. So, (until hadoop-1700), we
> need a work around.
> One way to do this is to open the file with overwrite flag on the second
> open. For security, would only want to do this for zero length files (could
> even check the creation ts too, but because of clock skew, that may be
> harder).
> Doug, Craig, Nicholas - Comments?
> -- pete
> ps since mostly already implemented, this should be a very quick patch
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