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https://issues.apache.org/jira/browse/HDFS-9607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15115548#comment-15115548
]
Dinesh S. Atreya commented on HDFS-9607:
----------------------------------------
Please see updated API from above below:
{code:title=FSWriteInPlaceStream.java|borderStyle=solid}
// (alternate names welcome) extends FSDataOutputStream
long getPos() // Get the current position, note FSDataOutputStream already
has it.
void seek(long desiredWritePos)
// Seek to the given position in file
int write(long position, byte[] writeBuffer, int readLength) throws
IOException
// Write/Update bytes from writeBuffer up to previously read length
// at given position in file
int write(long position, int readLength, byte[] writeBuffer, int offset,
int readLength) throws IOException
// Write/Update bytes from writeBuffer up to previously read length
// after seek in file starting at offset.
boolean canWrite(long position, byte[] writeBuffer, int readLength)
// Check whether Write/Update of bytes from writeBuffer up to
// previously read length at given position is possible inside file
boolean canWrite(long position, int readLength, byte[] writeBuffer, int
offset, int readLength)
// Check whether Write/Update of bytes from writeBuffer up to
// previously read length after seek is possible inside file starting at offset.
{code}
> Advance Hadoop Architecture (AHA) - HDFS Update (write-in-place)
> ----------------------------------------------------------------
>
> Key: HDFS-9607
> URL: https://issues.apache.org/jira/browse/HDFS-9607
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Dinesh S. Atreya
>
> Link to Umbrella JIRA
> https://issues.apache.org/jira/browse/HADOOP-12620
> Provide capability to carry out in-place writes/updates. Only writes in-place
> are supported where the existing length does not change.
> For example, "Hello World" can be replaced by "Hello HDFS!"
> See
> https://issues.apache.org/jira/browse/HADOOP-12620?focusedCommentId=15046300&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15046300
> for more details.
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