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https://issues.apache.org/jira/browse/HDFS-9607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15115577#comment-15115577
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Dinesh S. Atreya commented on HDFS-9607:
----------------------------------------
Alternatively, assuming {{getPos()}} and {{seek}} as given above are included
{code:title=FSWriteInPlaceStream.java|borderStyle=solid}
// (alternate names welcome) extends FSDataOutputStream
void setReadLength(int length) // Set the length that had been read earlier.
int getReadLength() // Get the read length that has been set.
int write(long position, byte[] writeBuffer) throws IOException
// Write/Update bytes from writeBuffer up to previously read length
// at given position in file
int write(long position, byte[] writeBuffer, int offset) 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)
// Check whether Write/Update of bytes from writeBuffer up to
// previously read length at given position is possible inside file
boolean canWrite(long position, byte[] writeBuffer, int offset)
// 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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