PrashantKasbe
3 Argentium

Algorithm for Clip in Centera

Hi Experts,

I am new to Centera and want to know which how can I know which algorithm is used to generate the CClip id for a documen which is uploaded to Centera.

For example I have metadata of a CDF file which contains the text as below:

<eclipblob md5="00NIL9G86HGAJxED9T8OJLT2F1H" size="104895000" offset="0"/>

From the above text I can see its saying md5 does that mean its using md5 algorithm.

Please help me if you have any idea about it.

Thanks
Prashant
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5 Replies
holgerjakob
3 Argentium

Re: Algorithm for Clip in Centera

Hi Prashant

The CClip ID would be the content address of the CDF. In the CDF there is (are) the content address of the referenced BLOBS.

Which naming scheme is used depends on the settings of storage strategy, the M++ settings and the size of the object.

GM would be the naming scheme for the CClip ID.

The M returns a 128-bit CA which is the MD5 hash of the object.
GM returns a 256-bit CA containing the MD5 of the object, a random bit-string, timestamp, counter and some header bits.
M++ is also a 256-bit CA containing the MD5 and a truncated SHA-256 bit of the object.

If I remember correctly, GM is used for the CDF's and Blobs smaller than the storage strategy full performance threshold.
M and M++ are used for the BLOBS larger than the threshold and depending on the M++ setting.


I don't have all the docs to really figure this out in detail for you but hope this helps as a starting point.

Best regards, Holger
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EMCDennis
3 Argentium

Re: Algorithm for Clip in Centera

Clips and blobs are named based on the md5 hash of the objects being written.

As Holger stated, the actual name depends on the storage strategy defined however the storage strategy appends additional information to the md5 name such as a GUID etc. The base is always around the md5 hash though. This hash is 26 characters. Depending on the storage strategy etc, additional information can be appended to this to create a 53 (26 character md5 hash + additional such as GUID) character name.
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Sienahk
1 Copper

Re: Algorithm for Clip in Centera

Hello,

Would the ClipID string use special characters like #, +, ?..

Thanks,

Donald

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holgerjakob
3 Argentium

Re: Algorithm for Clip in Centera

Hi Donald

The Clip ID uses letters and numbers. No special characters.

It's a 64 byte string.

Best regards, Holger

Sienahk
1 Copper

Re: Algorithm for Clip in Centera

Thank you Holger!

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