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• Customizations to an Elasticsearch 6.8.6 /etc/elasticsearch/elasticsearch.yml path.data and network.host fields will be lost when running the configuration script to upgrade to Elasticsearch 7 if the upgrade does not complete. This can happen if the new Elasticsearch 7 rpm is not in the current directory and cannot be downloaded. Reapply your customizations as this will not affect upgrades starting with Elasticsearch 7.5.2. (SWAR-9977)

• False 404s might be seen in the Swarm responses during heavy load situations. To mitigate this, please verify “cip.processes = 2”, and keep increasing the cip.queryMinimumTimeout value gradually until the 404 occurrences are reduced. (SWAR-10120)When using search.perDomainIndex=True (under Support guidance), the number of supported domains is limited based on the number of data nodes in the Elasticsearch cluster and search.numberOfShards. For

• example, Five data nodes support 5x600 shards at search.numberOfShards=6; each domain requires 6x2 (primary and replica) shards. If more than 250 domains are created, new indices cannot be created resulting in the domain listing that returns a 503 ReaderUnavailableIndex. The castor.log will show errors EFD19, EIP15, and EIP02.
  For example, "Validation Failed: this action would add [6] shards, but the cluster currently has maximum [999]/[1000] normal open shards". Error reporting will be improved in a future release. (SWAR-10172)This console error, also seen in SWAR-10203, happens when the ES cluster runs out of shard space leading to inability to create domain indices. (SWAR-10172)

  "Object (etag=51eb17e5e488d654bd79cc45aa695aef) is persistently failing for feed 0: Elasticsearch index failure (count=8)"

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• The Storage UI shows no NFS config if the Elasticsearch cluster is wiped. Contact DataCore Support for help in repopulating the SwarmFS config information. (SWAR-8007)

• Any incomplete multipart upload into a bucket leaves the parts (unnamed streams) in the domain if the bucket is deleted. To find and delete those parts, use the s3cmd utility (search the Support site for "s3cmd" guidance). (SWAR-7690)

• The chassis shuts down but does not come back up when restarting a cluster of virtual machines that are UEFI-booted (versus legacy BIOS). (SWAR-8054)

• Invalid config parameters that prevent the unassigned nodes from booting are created if subcluster assignments are removed in the CSN UI. (SWAR-7675)

• Customers need to wait 1 minute or more to get the changes done in feed definition to be effective throughout the cluster. (SWAR-10007)

• Swarm 16.1.2 introduces a regression if the Search Feed index has been "split" under the guidance of DataCore Support. Listings will fail with the error: FEEDS.ELASTICSEARCH ERROR: EIP19 DetectCaseSensitivityRequest: detection of Elasticsearch case-sensitive/case-insensitive configuration failed (index_swarm.sollab.local0).
  To workaround this issue, create an alias named index_<cluster.name><feed-id> (e.g. "index_swarm.sollab.local0") that points to the split index name. See the new last step here. (SWAR-10240)

To upgrade Swarm 9 or higher, proceed to How to Upgrade Swarm. For migration from Swarm 8.x or earlier, contact DataCore Support for guidance.

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