If we take a 2*2 dist-replicate setup with brick1, brick3 on server1 and brick2, brick4 on server2, (brick1/3 in one pair and brick 2/4 in another pair) following behaviour will lead to a split-brain. When NFS server is started along with the volumes, dht from NFS server attempts setxattr which would be received by the afr-children that are up, causing pending meta-data on the other children which are not up.
The very first time the bricks are up dht needs to setup the necessary xattrs on the bricks. These events are percolated up in the graph (in this case dht). The second issue you describe (missing xattrs) is not a bug.īug is that the replicate translator notifies child_up(brick process coming up) event as soon as any of its children come up/down instead of waiting for all the children to notify atleast one event for the very first time. For volumes already created you will have to manually remove the xattrs from the backend with setfattr -x. The fix is underway already for the meta-data split brain issue. > Is there a planned date to fix this bug? > Both of these were checked right after creating a volume. Changelogs (xattrs) are written on demand where found necessary. Also the case when you first create a file (unless the mkdir utility command performs the extra chmod/chown syscall after the mkdir syscall). For e.g., as soon as you mkdir, the attributes will be empty. There are a lot of well explained reasons why files/directories need not have extended attributes on them. Why are there afr created for some but not for others?Īgain, this is not a reason to get alarmed. For now you can just delete the attributes from the backend safely (setfattr -x) as we know that it is benign in this case. Even then, I suspect it is only associated with the "meta data split-brain" (as the changes are seen in the last 4 bytes (the metadata changelog). The values in the output are base64 encoded by default and tricky to interpret. To get the exact answer to that please get the output of getfattr with "-e hex". > below eg: /data/gluster doesn't have all A's when volume is created. > 1) Where afr attributes are not consistent on the mount point of the volume. # file: ~]# ls ~]# getfattr -dm - /data2/gluster Getfattr: Removing leading '/' from absolute path names for gluster]# getfattr -dm - /data2/gluster Please fix the file on all backendĬan someone please help me reason for this problem?Ģ) Some bricks missing xattr info. The experimental results show that an architecture based on blockchain and distributed hash table has better efficiency but needs a longer time to execute than the two other architectures using a centralized database.1) When I create a volume the gluster mount point has inconsistent xattrĠ-stress-volume-replicate-0: Unable to self-heal permissions/ownership Furthermore, we leverage distributed ledger technology's immutability and traceability properties and distributed hash table unlimited storage feature to improve the system's storage capacity and immutability by evaluating three possible architectures. We store users' information on a distributed hash table and transactional events on the distributed ledger after identifying users by implementing machine learning functions.
This article demonstrates a decentralized smart identification scheme for video conferencing applications based on biometric technology, machine learning, and a decentralized hash table combined with blockchain technology. At the same time, video conferencing applications are being migrated from centralized to decentralized solutions for better performance without the need for third-party interactions. Current video conference technologies typically rely on cloud systems to provide a stable and secure basis for executing tasks and processes. However, integrity, security, identification, and authentication problems are still universal. Video conferencing applications help people communicate via the Internet and provide a significant and consistent basis for virtual meetings.
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