For one thing, HDFS does a few megabyes of
> readahead internally by default. If you are going to make a
> performance improvement suggestion, I would strongly encourage you to
> test it first.
>
> cheers,
> Colin
>
>
> On Tue, Dec 15, 2015 at 2:22 PM, dam6923 . wrote:
time, not a byte at
a time. An 8Kbyte array is a good size."
On Tue, Dec 15, 2015 at 3:41 PM, Colin McCabe wrote:
> Hi David,
>
> Do you have benchmarks to justify changing this configuration?
>
> best,
> Colin
>
> On Wed, Dec 9, 2015 at 8:05 AM, dam6923 . wrote:
>
Hello!
A while back, Java 1.6, the size of the internal internal file-reading
buffers were bumped-up to 8192 bytes.
http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/io/BufferedInputStream.java
Perhaps it's time to update Hadoop to at least this default level too.
