Tar file naming conventions

Forum|Forum|5 years ago
July 16, 2020
2 replies
2377 views

The tar files used by AEM in the repository/segmentstore have names like dataNNNNNL.tar, where NNNNN is a 5 digit number and L is a letter. What happens when NNNNN needs to be greater than 99999?

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Best answer by arunpatidar

Hi,

Can you please check below if it helps:

Oak TAR file layout

A few words on how Oak names TAR files. The convention is to always start with a data00000a.tar file. As data is written to the repository, new TAR files are added with increasing numbers, thus ending up with data00001a.tar, data00002a.tar and so on.

Each time a compaction cycle ends, there is a cleanup phase in which segments from an old generation are purged. Those tar files that shrink by at least 25% are rewritten to a new tar generation, skipping the reclaimed segments. A shrunk TAR file increases its tail generation character, e.g. from data00000a.tar to data00000b.tar.

More info ☞

arunpatidar

Accepted solution

Community Advisor

Hi,

Can you please check below if it helps:

Oak TAR file layout

A few words on how Oak names TAR files. The convention is to always start with a data00000a.tar file. As data is written to the repository, new TAR files are added with increasing numbers, thus ending up with data00001a.tar, data00002a.tar and so on.

Each time a compaction cycle ends, there is a cleanup phase in which segments from an old generation are purged. Those tar files that shrink by at least 25% are rewritten to a new tar generation, skipping the reclaimed segments. A shrunk TAR file increases its tail generation character, e.g. from data00000a.tar to data00000b.tar.

More info ☞

Arun Patidar

M

marcush35887118Author

Level 2

Thanks for the info and link. Our webmaster runs compaction weekly and was noticing the numbers steadily increasing and was wondering how the naming conventions would be handled since we're up around 64832.

A