[Bugs] [Bug 1194753] Storage tier feature

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1194753



--- Comment #32 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9683 committed in master by Vijay Bellur
(vbellur at redhat.com) 
------
commit 87c7fa3cfdadca4ee883daf84373302a42ad5fdc
Author: Joseph Fernandes <josferna at redhat.com>
Date:   Wed Feb 18 19:45:23 2015 +0530

    Adding Libgfdb to GlusterFS

    *************************************************************************
                Libgfdb                        |
    *************************************************************************
    Libgfdb provides abstract mechanism to record extra/rich metadata
    required for data maintenance, such as data tiering/classification.
    It provides consumer with API for recording and querying, keeping
    the consumer abstracted from the data store used beneath for storing data.
    It works in a plug-and-play model, where data stores can be plugged-in.
    Presently we have plugin for Sqlite3. In the future will provide recording
    and querying performance optimizer. In the current implementation the
schema
    of metadata is fixed.

    Schema:
    ~~~~~~
          GF_FILE_TB Table:
          ~~~~~~~~~~~~~~~~~
          This table has one entry per file inode. It holds the metadata
required to
          make decisions in data maintenance.
          GF_ID (Primary key)    : File GFID (Universal Unique IDentifier in
the namespace)
          W_SEC, W_MSEC         : Write wind time in sec & micro-sec
          UW_SEC, UW_MSEC        : Write un-wind time in sec & micro-sec
          W_READ_SEC, W_READ_MSEC     : Read wind time in sec & micro-sec
          UW_READ_SEC, UW_READ_MSEC : Read un-wind time in sec & micro-sec
          WRITE_FREQ_CNTR INTEGER    : Write Frequency Counter
          READ_FREQ_CNTR INTEGER    : Read Frequency Counter

          GF_FLINK_TABLE:
          ~~~~~~~~~~~~~~
          This table has all the hardlinks to a file inode.
          GF_ID        : File GFID               (Composite Primary Key)``|
          GF_PID        : Parent Directory GFID  (Composite Primary Key)   |->
Primary Key
          FNAME         : File Base Name          (Composite Primary Key)__|
          FPATH         : File Full Path (Its redundant for now, this will go)
          W_DEL_FLAG     : This Flag is used for crash consistancy, when a link
is unlinked.
                            i.e Set to 1 during unlink wind and during unwind
this record
                              is deleted
          LINK_UPDATE     : This Flag is used when a link is changed i.e
rename.
                              Set to 1 when rename wind and set to 0 in rename
unwind

    Libgfdb API:
    ~~~~~~~~~~~
    Refer libglusterfs/src/gfdb/gfdb_data_store.h

    Change-Id: I2e9fbab3878ce630a7f41221ef61017dc43db11f
    BUG: 1194753
    Signed-off-by: Joseph Fernandes <josferna at redhat.com>
    Signed-off-by: Dan Lambright <dlambrig at redhat.com>
    Signed-off-by: Joseph Fernandes <josferna at redhat.com>
    Reviewed-on: http://review.gluster.org/9683
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Vijay Bellur <vbellur at redhat.com>

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