cluster/ec: Scripts to find and reset files which can be healed.

gfid_needing_heal_parallel.sh - Finds out if a file is healable or not.

correct_pending_heals.sh - Makes necessary changes in xattrs to enable
heal for those files which could be healed.

fixes: #723
Change-Id: I38177888df0fda9486343ee546dc02836b06a5fc

1 files changed, 69 insertions, 0 deletions

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+# gluster-heal-scripts
+Scripts to correct extended attributes of fragments of files to make them healble.
+
+Following are the guidelines/suggestions to use these scripts.
+
+1 - Passwordless ssh should be setup for all the nodes of the cluster.
+
+2 - Scripts should be executed from one of these nodes.
+
+3 - Make sure NO "IO" is going on for the files for which we are running
+these two scripts.
+
+4 - There should be no heal going on for the file for which xattrs are being
+set by correct_pending_heals.sh. Disable the self heal while running this script.
+
+5 - All the bricks of the volume should be UP to identify good and bad fragments
+and to decide if an entry is healble or not.
+
+6 - If correct_pending_heals.sh is stopped in the middle while it was processing
+healble entries, it is suggested to re-run gfid_needing_heal_parallel.sh to create
+latest list of healble and non healble entries and "potential_heal" "can_not_heal" files.
+
+7 - Based on the number of entries, these files might take time to get and set the
+stats and xattrs of entries.
+
+8 - A backup of the fragments will be taken on <brick path>/.glusterfs/correct_pending_heals
+    directory with a file name same as gfid.
+
+9 - Once the correctness of the file gets verified by user, these backup should be removed.
+
+10 - Make sure we have enough space on bricks to take these backups.
+
+11 - At the end this will create two files -
+     1 - modified_and_backedup_files - Contains list of files which have been modified and should be healed.
+     2 - can_not_heal - Contains list of files which can not be healed.
+
+12 - It is suggested that the integrity of the data of files, which were modified and healed,
+     should be checked by the user.
+
+
+Usage:
+
+Following are the sequence of steps to use these scripts -
+
+1 - ./gfid_needing_heal_parallel.sh <volume name>
+
+    Execute gfid_needing_heal_parallel.sh with volume name to create list of files which could
+    be healed and can not be healed. It creates "potential_heal" and "can_not_heal" files.
+    During execution, it also displays the list of files on consol with the verdict.
+
+2 - ./correct_pending_heals.sh
+
+    Execute correct_pending_heals.sh without any argument. This script processes entries present
+    in "heal" file. It asks user to enter how many files we want to process in one attempt.
+    Once the count is provided, this script will fetch the entries one by one from "potential_heal" file and takes necessary action.
+    If at this point also a file can not be healed, it will be pushed to "can_not_heal" file.
+    If a file can be healed, this script will modify the xattrs of that file fragments and create an entry in "modified_and_backedup_files" file
+
+3 - At the end, all the entries of "potential_heal" will be processed and based on the processing only two files will be left.
+
+     1 - modified_and_backedup_files - Contains list of files which have been modified and should be healed.
+     2 - can_not_heal - Contains list of files which can not be healed.
+
+Logs and other files -
+
+1 - modified_and_backedup_files  - It contains all the files which could be healed and the location of backup of each fragments.
+2 - can_not_heal - It contains all the files which can not be healed.
+3 - potential_heal - List of files which could be healed and should be processed by "correct_pending_heals.sh"
+4 - /var/log/glusterfs/ec-heal-script.log - It contains logs of both the files.