3.9 Release Notes

Container-Native Storage 3.9

Release Notes for Container-Native Storage on OpenShift Container Platform 3.9

Edition 1

Bhavana Mohan

Customer Content Services Red Hat

Abstract

These release notes provide high-level coverage of the improvements and additions that have been implemented in Container-Native Storage for OpenShift Container Platform 3.9.

Chapter 1. What's New in this Release?

This section describes the key features and enhancements in the Container-Native Storage 3.9 release.

Chapter 2. Notable Bug Fixes

This chapter describes bugs fixed in this release of Container-Native Storage for OpenShift Container Platform that have significant impact on users.
This release addresses many customers reported issues related to Heketi and Gluster database going out of synchronization leaving the system with stale metadata about a number of PV’s, old deleted PV’s, and failed transaction metadata. Container-Native Storage 3.9 handles Heketi and underlying Gluster subsystem more robustly.
This release also addresses some of the issues reported by customers on Block backed PV's specifically under failure scenario and after recovery from such failures.

heketi

BZ#1415750
Previously, deleting an heketi pod while some heketi operation was in progress would result in incomplete entries in the database. With this fix, such entries are marked "pending" until the operation is completed, thus leading to a consistent database view.
BZ#1434668
Earlier, the 'device info' output displayed the state of the device as 'failed' after a device remove operation was completed. With this fix, the state of the device is changed to 'removed' which matches with the operation performed.
BZ#1437798
Earlier, it was possible to run multiple device remove operations in parallel on the same device. This led to race conditions and database inconsistencies. With this fix, an error is returned while another device remove operation on the same device is already in progress.

kubernetes

BZ#1505290
Previously, the gluster-block provisioner did not identify the storage units correctly in the PVC. For example, it would identify 1 as 1GiB by default and the provisioner would fail on 1Gi. With this enhancement, gluster-block provisioner identifies the storage units correctly, ie, 1 will be treated as 1 byte, 1Gi will be treated as 1 GibiByte, and 1Ki will be treated as 1KibiByte.

Chapter 3. Known Issues

This chapter provides a list of known issues at the time of release.
  • In a gluster cluster with more than three nodes, if one or more nodes are down, but at least three nodes are up, heketi intermittently fails to create new replica 3 volumes, even if the healthy nodes have sufficient space available.
    To workaround this issue, execute the following commend on the unavailable nodes, which makes heketi volume creation 100% reliable:
    # heketi-cli node disable <node-id>
    After the nodes are available again, execute the following command to let heketi take this node into account again when creating volumes:
    heketi-cli node enable <node-id>
  • Volumes that were created using Container-Native Storage 3.5 or previous do not have the GID stored in heketi database. Hence, when a volume expansion is performed, new bricks do not get the group ID set on them which might lead to I/O errors.
  • The following two lines might be repeatedly logged in the rhgs-server-docker container/gluster container logs.
    [MSGID: 106006] [glusterd-svc-mgmt.c:323:glusterd_svc_common_rpc_notify] 0-management: nfs has disconnected from glusterd.
    [socket.c:701:__socket_rwv] 0-nfs: readv on /var/run/gluster/1ab7d02f7e575c09b793c68ec2a478a5.socket failed (Invalid argument)
    These logs are added as glusterd is unable to start the NFS service. There is no functional impact as NFS export is not supported in Containerized Red Hat Gluster Storage.

Appendix A. Revision History

Revision History
Revision 1.0-4Thu Apr 05 2018Bhavana Mohan
Publishing for CNS 3.9 release.
Revision 1.0-3Wed Apr 04 2018Bhavana Mohan
Included a known issue and incorporated review comments.
Revision 1.0-2Tue Mar 27 2018Bhavana Mohan
Updated the What's New chapter and the Notable Bug Fixes chapter.
Revision 1.0-1Wed Mar 14 2018Bhavana Mohan
Initial creation by publican

Index

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