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                       Release Notes JSOC V4.7         16Oct2008
                       -----------------------         ---------


A release is a set of files, each having a specific version.  And a release typcially
has a version number because over time you have newer and newer releases of the 
same product.  For example, a hypothetical 1.3 release may contain fileA#1.8, 
fileB#1.2, fileC#2.2 and a 1.4 release may contain fileA#2.5, fileB#2.1, fileC#2.9. 
JSOC releases are similarly versioned and contain a set of such files.  JSOC release
code is guaranteed to compile on cluster nodes (eg., n00, n02).  The resulting binaries
have been minimally tested.  At the time of the creation of the release, the
release versions of each file will be the most recent.  But as time passes, newer versions 
of some files will be made, and there is no guarantee that these changes will
not destabilize JSOC (ie., they may cause JSOC to no longer compile or execute
properly).  

There are several ways to use this release.  If you wish to simply use pre-built
binaries, you can simply use the production binaries, which are located at 
/home/production/cvs/JSOC.  Every time a release is created, the binaries in
this location get updated.  Only the production user can update these binaries.
So, you could run /home/production/cvs/JSOC/bin/linux_x86_64/show_keys, for example.
If instead you want to work with stable source files, then you must have a sandbox,
which is a local copy (in your home directory) of the files in the cvs depot.  
You would probably want to work with a sandbox if you plan on making eventual 
changes to the depot files.  Changes you make to your sandbox files are not visible 
to other users until you "commit" those changes back to the cvs depot.  Please see
"If You Don't Have a Sandbox" below for more information on how to create a sandbox.  
There is also a "working" release which resides in in /home/jsoc/cvs/JSOC.  New 
files may be placed here and existing files may be edited for common use before the 
next official release.  Each time a release gets created, the source and binaries of 
the working release get updated.  WARNING: the files you see here may not be stable 
since by the time you see them, another user may have edited them. Only the production 
release is guaranteed to be stable and unchanged between releases.

Obtaining the Release
---------------------
To update your working directory to this release, or to check-out this release anew, 
please visit http://jsoc.stanford.edu/jsocwiki/CvsInit. Please keep in mind that
users may have modified files since the release was created, so use of the 
scripts documented in the web page may result in a working directory whose
content is not identical to the release.  If updating, you can supply 
the flag "-R" to the jsoc_update.pl and jsoc_sync.pl scripts to download the
latest release.  This will ensure that your working directory has the exact, latest
release versions of the files (eg., jsoc_sync.csh -R). If checking-out, 
you can supply the argument "-r Ver_LATEST" to the "cvs checkout" command
to achieve the analogous result, but for a fresh checkout.  WARNING: if you use 
the "-R" or "-r" flags, please use only jsoc_update.pl or jsoc_sync.pl to update 
your sources thereafter.  Use of "-R" or "-r Ver_LATEST" will result in a cvs
"sticky flag" being set.  jsoc_update.pl and jsoc_sync.pl clear this sticky flag.

Additional Info
---------------
If you are unfamiliar with the use of cvs see the file:
JSOC/CM/working_with_sandbox.txt.

There's a linux4 cvs gui at xim:/usr/bin/lincvs
Also on our jsoc web page:

http://jsoc.stanford.edu/cvs/JSOC/

Use the Apache cvs gui to see the diffs. For example, go to
http://jsoc.stanford.edu/cvs/JSOC/base/drms/
and click on the name in the File column and then click on
"diffs to previous #" to see the diffs.

Changes since previous release (V4.5 - July 16, 2008)
-----------------------------------------------------

NEW FEATURES: 
* Added functions drms_series_cancreaterecord(),
drms_series_candeleterecord(), and drms_series_canupdaterecord() that
say whether the caller is able to modify records in a series.

* Record-set chunking. You can use new API functions,
drms_open_recordset() and drms_recordset_fetchnext(), that allow you
to work with 'chunks' of records in memory. The old
drms_open_records() places ALL records in memory. Working with chunks
will minimize the memory footprint of your module. Also, sufficiently
large queries (queries that result in a large number of records) are
truncated with the drms_open_records() call, but not with the
drms_open_recordset() call.  Currently, you must traverse the records
from the first to the last, in the order returned by the
drms_open_recordset() call.

* libcmdparams.a's cmdparams structure now contains the original
cmd-line arguments (use cmdparams_get_argv() to fetch them).

* show_info now lists the archive, retention, and unitsize in the
series info, and the sunum for each record for which information is
printed.

* There is now a way for a user to abort lookdata.html - useful for
long queries.

* Make support for building intel mac architectures. This does not
mean that mac binaries will compile and run. It means that the make
files will now allow an attempt to compile.

* decode_hk now decodes double precision and single precision floats.

* Initial implementation of iorbit_getinfo (calculates orbit
information from FDS orbit data). It operates on FDS data in chunks,
caching these "grid-point" orbits vectors for reuse in multiple calls
to iorbit_getinfo.

BUG FIXES:

* Control-C will now cleanly shut down drms modules. Previously, the
server was terminated, but the client did not get the memo. So the
client would keep trying to contact the server.  This could generate
lots of debug messages, and at worst, crashes could occur.

* Overhaul of parsing of record-set queries containing string
values. Also, some problems with parsing time strings were fixed (like
the failure when parsing negative time strings). Fix drms_sscanf()
which is largely reponsible for parsing these values (it is now named
drms_sscanf2()).

* Fix many issues with "show_info -j" not producing valid .jsd files.

* .jsd Fix: .jsd files with 'index' keywords were resulting in series
without any dbindex.

* Fix ingest_lev0 small_img segment - it was not putting the
bzero/bscale values into the fits header.

* Fix a crash in drms_query_bin(). The function was calculating a
buffer length the wrong way (it should have used PQgetlength()).

PERFORMANCE:

* Significant improvement in TAS-file and FITS-file slice access.

* We modified the cfitsio source code to remove a file-buffering
conflict - this improved FITS file re-reads performance dramatically.

* When writing records to a TAS file, no longer are the superfluous
and empty slot directories created.

* Significant improvement in jsoc_info json library - removed an
O(n^2) algorithm, and made reallocs more efficient. jsoc_info is used
by lookdata.

OTHER: 
* Global debug flag set back to 0 - by default, make will
create release (no symbols) binaries.