* HDFS module ported to current AIORI API and extended
* Added instructions how to build and run with a HDFS.
* Replaced read with pread to support offsets.
* Implemented HDFS MDTest API
* Improved sync semantics
Context: Some backends may have used different names in
the past (like IME backend use to be IM). Legacy scripts
may break.
This patch adds a legacy name option in the aiori structure.
Both name and legacy name work to select the interface.
But the following warning is printed if the legacy name is used:
ior WARNING: [legacy name] backend is deprecated use [name] instead.
This commit makes changes to the AIORI backends to add support for
abstacting statfs, mkdir, rmdir, stat, and access. These new
abstractions are used by a modified mdtest. Some changes:
- Require C99. Its 2017 and most compilers now support C11. The
benefits of using C99 include subobject naming (for aiori backend
structs), and fixed size integers (uint64_t). There is no reason to
use the non-standard long long type.
- Moved some of the aiori code into aiori.c so it can be used by both
mdtest and ior.
- Code cleanup of mdtest. This is mostly due to the usage of the IOR
backends rather than a mess of #if code.
Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>
Along the way, added a bunch of diagnostic output in the HDFS calls, which
only shows up at verbosity >= 4. I'll probably remove this stuff before
merging with master. Also, there's an #ifdef'ed-out sleep() in place,
which I used to attach gdb to a running MPI task. I'll get rid of that
later, too.
Also, added another hdfs-related parameter to the IOR_param_t structure;
hdfs_user_name gets the value of the USER environment-variable as the
default HDFS user for connections. Does this cause portability problems?
This provides an HDFS back-end, allowing IOR to exercise a Hadoop
Distributed File-System, plus corresponding changes throughout, to
integrate the new module into the build. The commit compiles at LANL, but
hasn't been run yet. We're currently waiting for some configuration on
machines that will eventually provide HDFS. By default, configure ignores
the HDFS module. You have to explicitly add --with-hdfs.
Julian Kunkel