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1. Create directories in following fashion for history API's
usage when consumer is registered with libgfchangelog
shared library through gf_changelog_register.
scratch_dir/.history
scratch_dir/.history/.current
scratch_dir/.history/.processed
scratch_dir/.history/.processing
2. Added new file 'gf-history-changelog.c' and following APIs
are provided for consumers to process history changelogs.
1. gf_history_changelog_scan:
Move processed history changelog file from
.processing to .processed
2. gf_history_changelog_next_change:
Return the next history changelog file entry.
Zero means all history chanelogs are consumed.
3. gf_history_changelog_done:
Scan .processing directory and generate a list of
change entries.
4. gf_history_changelog_start_fresh:
For a set of changelogs, start from the begining.
NOTE: Though this patch provides above funcationalities.
It is considered functionally full with the
patch (http://review.gluster.org/#/c/6930/).
Change-Id: I200780c7278e0a6c008910d93faad5858a4b3e76
Original-author: Kotresh H R <khiremat@redhat.com>
Signed-off-by: Kotresh H R <khiremat@redhat.com>
Signed-off-by: Ajeet Jha <ajha@redhat.com>
Reviewed-on: http://review.gluster.org/6998
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Venky Shankar <vshankar@redhat.com>
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Bug fix for Coverity CID: 1124791
Change-Id: I0362d45123ebc250290f3a5231f7fb113fa41212
BUG: 789278
Signed-off-by: Raghavendra Talur <rtalur@redhat.com>
Reviewed-on: http://review.gluster.org/6900
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Reviewed-by: Santosh Pradhan <spradhan@redhat.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
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Bug fix for Coverity-CID 1124847.
Change-Id: I410ef8e06cbc491b1f72535298fae5e9bc77220d
BUG: 789278
Signed-off-by: Raghavendra Talur <rtalur@redhat.com>
Reviewed-on: http://review.gluster.org/6870
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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Block all signal except those which are set for explicit handling
in glusterfs_signals_setup(). Since thread spawning code in
libglusterfs and xlators can get called from application threads
when used through libgfapi, it is necessary to do this blocking.
Change-Id: Ia320f80521a83d2edcda50b9ad414583a0175281
BUG: 1011662
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/5995
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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at syslog side, log message is identified by its properties like
programname, pid, etc. brick/mount processes need to be identified
uniquely as they are different process of gluterfsd/glusterfs. At
rsyslog side, log separated by programname/app-name with pid works but
bit hard to identify them in long run which process is for what
brick/mount.
This patch fixes by setting identity string at openlog() which sets
programname/app-name as similar to old style log file prefixed by
gluster, glusterd, glusterfs or glusterfsd
Change-Id: Ia05068943fa67ae1663aaded1444cf84ea648db8
BUG: 928648
Signed-off-by: Bala.FA <barumuga@redhat.com>
Reviewed-on: http://review.gluster.org/5541
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
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This is the initial version of the Changelog Translator.
What is it
-----------
Goal is to capture changes performed on a GlusterFS volume.
The translator needs to be loaded on the server (bricks) and
captures changes in a plain text file inside a configured
directory path (controlled by "changelog-dir", should be
somewhere in <export>/.glusterfs/changelog by default).
Changes are classified into 3 types:
- Data: : TYPE-I
- Metadata : TYPE-II
- Entry : TYPE-III
Changelog file is rolled over after a certain time interval
(defauls to 60 seconds) after which a changelog is started.
The thing to be noted here is that for a time interval
(time slice) multiple changes for an inode are recorded only
once (ie. say for 100+ writes on an inode that happens within
the time slice has only a single corresponding entry in the
changelog file). That way we do not bloat up the changelog
and also save lots of writes.
Changelog Format
-----------------
TYPE-I and TYPE-II changes have the gfid on the entity on
which the operation happened. TYPE-III being a entry op
requires the parent gfid and the basename. Changelog format
has been kept to a minimal and it's upto the consumers to
do the heavy loading of figuring out deletes, renames etc..
A single changelog file records all three types of changes,
with each change starting with an identifier ("D": DATA,
"M": METADATA and "E": ENTRY). Option is provided for the
encoding type (See TUNABLES).
Consumers
----------
The only consumer as of today would be geo-replication, although
backup utilities, self-heal, bit-rot detection could be possible
consumers in the future.
CLI
----
By default, change-logging is disabled (the translator is present
in the server graph but does nothing). When enabled (via cli) each
brick starts to log the changes. There are a set of tunable that
can be used to change the translators behaviour:
- enable/disable changelog (disabled by default)
gluster volume set <volume> changelog {on|off}
- set the logging directory (<brick>/.glusterfs/changelogs is the
default)
gluster volume set <volume> changelog-dir /path/to/dir
- select encoding type (binary (default) or ascii)
gluster volume set <volume> encoding {binary|ascii}
- change the rollover time for the logs (60 secs by default)
gluster volume set <volume> rollover-time <secs>
- when secs > 0, changelog file is not open()'d with O_SYNC flag
- and fsync is trigerred periodically every <secs> seconds.
gluster volume set <volume> fsync-interval <secs>
features/changelog: changelog consumer library (libgfchangelog)
A shared library is provided for the consumer of the changelogs
for easy acess via APIs. Application can link against this library
and request for changelog updates. Conversion of binary logs to
human-readable ascii format is also taken care by the library which
keeps a copy of the changelog in application provided working
directory.
Change-Id: I75575fb7f1c53d2bec3dba1a329ea7bb3c628497
BUG: 847839
Original Author: Venky Shankar <vshankar@redhat.com>
Signed-off-by: Avra Sengupta <asengupt@redhat.com>
Reviewed-on: http://review.gluster.org/5127
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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