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Bala Harish A(AC)

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  • Several settings that are persisted in the stream of cluster’s persistent settings have their defaults changed in this version. It is recommended to review these settings and make appropriate adjustments.

    • health.examDelay now defaults to 0.19. It is recommended Not to use a value lower than the default.

    • health.fvrPushDelay has a new default of 0.7, which is recommended for most clusters.

    • power.savingMode has a new default of False, which is recommended for most clusters.

    • scsp.defaultSynchronousIndexWait has a new default of 60, which is recommended for most clusters. This is a non-persisted setting.

  • Configuring elasticsearch.yml's network.host (https://www.elastic.co/guide/en/elasticsearch/reference/7.16/important-settings.html#network.host) to "__site__" might not choose the right IP to allow master election if the server is multi-homed. Modify the elasticsearch.yml to enter a specific IP for the node and the configuration script will preserve it. (SWAR-9350)
    If you run into this issue, the fix is to:

    • systemctl stop elasticsearch on all ES nodes

    • remove all the contents of the path.data directory

    • change network.host: <IP of ES NIC in the Storage VLAN>

    • systemctl start elasticsearch

  • Elasticsearch can fail to start and return a warning "unable to load JNA native support library", which is due to SELinux setting “noexec” on /tmp.
    For Elasticsearch 7.5.2, edit “/etc/elasticsearch/jvm.options” replacing the line "-Djava.io.tmpdir=${ES_TMPDIR}" with "-Djava.io.tmpdir=/var/log/elasticsearch". With Elasticsearch 7.17, uncomment the "Environment=ES_TMPDIR=/usr/share/elasticsearch/tmp" line in /etc/systemd/system/elasticsearch.service.d/override.conf and create that directory. (SWAR-9347)

  • Swarm versions 10.0 onward are vulnerable to kernel issues manifested on some Intel CPUs. Symptoms include lowered performance, long mount times, and cluster instability. Swarm versions 14.1 and later provide a workaround for this issue, see https://caringo.atlassian.net/wiki/spaces/KB/pages/2973204604. (SWAR-9055)

  • Customers who perform paginated listing queries (using sort and marker) need to choose a unique set of fields to return the complete results. (SWAR-9630)

  • Writes of objects into versioned buckets suffer a small (constant) performance penalty. This only applies to the 15.3.0 release. (SWAR-9794)

  • The search configuration utility was upgraded to caringo-elasticsearch-search-7.1.0-1.noarch.rpm and Elasticsearch 7.17.9 is now the default version installed. If you are running the Elasticsearch 7.5.2, do not install the 7.17.9 rpm directly. AlternativelyInstead, run the latest configuration script configure_elasticsearch_with_swarm_search.py. The configuration script upgrades /etc/sysconfig/elasticsearch, so that the default Elastic-bundled JDK is used. (SWAR-9159)

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