What are the differences between the 3 concepts: (1) namenode metadata, (2)
namenode image, and (3) edit logs?
BTW,I know the secondary namenode backups namenode data.
I was told that there is another daemon which also backups meta data . Is that
true? What is the daemon? Thanks.
Does anybody have the similar issue? If you store XML files in HDFS, how can
you make sure a chunk reads by a mapper does not contain partial data of an XML
segment?
For example:
book1
me
..what if this is the boundary of a chunk?...
2009
book2
me
2009
book3
me
would someone give us a hint? Thanks.
Why "java.util.zip.ZipOutputStream" need to use /tmp?
The hadoop version is 0.18.3 . Recently we got "out of space" issue. It's from
"java.util.zip.ZipOutputStream".
We found that /tmp is full and after cleaning /tmp the problem is solved.
However why hadoop
The hadoop version is 0.18.3 . Recently we got "out of space" issue. It's from
"java.util.zip.ZipOutputStream".
We found that /tmp is full and after cleaning /tmp the problem is solved.
However why hadoop needs to use /tmp? We had already configured hadoop tmp to a
local disk in: hadoop-site.x
