[
https://issues.apache.org/jira/browse/CASSANDRA-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244746#comment-13244746
]
Jonathan Ellis commented on CASSANDRA-2749:
-------------------------------------------
Did some more research on path limitations:
NTFS is technically okay with paths up to 32K long[1], but the windows api is
limited to 256[2]. Common Linux filesystems have a limit of 255 bytes per path
*component* (i.e. directory or filename) but no total path limit. However,
Linux defines PATH_MAX and FILENAME_MAX, both 4096. [3]
[1] http://en.wikipedia.org/wiki/Comparison_of_file_systems
[2] http://msdn.microsoft.com/en-us/library/aa365247.aspx
[3] http://serverfault.com/questions/9546/filename-length-limits-on-linux
In short: restricting KS and CF names to 32 characters is a good idea for the
benefit of Windows portability. However, we may want to exempt Linux systems
from the startup length check to allow easier upgrades.
> fine-grained control over data directories
> ------------------------------------------
>
> Key: CASSANDRA-2749
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2749
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Sylvain Lebresne
> Priority: Minor
> Fix For: 1.1.0
>
> Attachments: 0001-2749.patch,
> 0001-Make-it-possible-to-put-column-families-in-subdirect.patch,
> 0001-non-backwards-compatible-patch-for-2749-putting-cfs-.patch.gz,
> 0002-fix-unit-tests.patch, 0003-Fixes.patch, 2749.tar.gz,
> 2749_backwards_compatible_v1.patch, 2749_backwards_compatible_v2.patch,
> 2749_backwards_compatible_v3.patch, 2749_backwards_compatible_v4.patch,
> 2749_backwards_compatible_v4_rebase1.patch, 2749_not_backwards.tar.gz,
> 2749_proper.tar.gz
>
>
> Currently Cassandra supports multiple data directories but no way to control
> what sstables are placed where. Particularly for systems with mixed SSDs and
> rotational disks, it would be nice to pin frequently accessed columnfamilies
> to the SSDs.
> Postgresql does this with tablespaces
> (http://www.postgresql.org/docs/9.0/static/manage-ag-tablespaces.html) but we
> should probably avoid using that name because of confusing similarity to
> "keyspaces."
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
