[dhi-servers] IRIS_DataCenter returns seismograms with insufficient bytes

[Philip Crotwell]

 From the IRIS_DataCenter, for
IU.COR.00.BHZ from 2006/01/01 00:00:00 GMT to 2006/01/01 01:00:00 GMT
I get back 4 seismograms. The first seismogram claims to have 17363  
samples in it. However, the actual data consists of 3 EncodedData  
objects, each of which has 448 bytes of steim2 compressed data. It is  
not possible within stiem2 to compress 17363 samples into 1344 bytes,  
that would be less than one bit per sample.

I suspect that there are some combination of 4K and  512 byte records  
for this chanel. Perhaps realtime comes in with 512 bytes records and  
the qc'ed data comes in with 4K and perhaps the server is getting the  
number of points from the database based on 4K records and then  
actually sending back the data from the 512 byte records.

This seems to happen to many other channels as well. This bug, IMHO,  
makes the IRIS_DataCenter usuable at present.

I have opens a jira bug to track this:
http://www.iris.edu/jira/browse/DHI-30

thanks,
Philip