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MRS-operation-guide-lts/umn/source/managing_clusters/patch_management/rolling_patches.rst
proposalbot ac0532e380 Changes to mrs_umn from docs/doc-exports#462 (MRS UMN 2.0.38.SP20 version 
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Reviewed-by: Kacur, Michal <michal.kacur@t-systems.com>
Co-authored-by: proposalbot <proposalbot@otc-service.com>
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Rolling Patches

The rolling patch function indicates that patches are installed or uninstalled for one or more services in a cluster by performing a rolling service restart (restarting services or instances in batches), without interrupting the services or within a minimized service interruption interval. Services in a cluster are divided into the following three types based on whether they support rolling patch:

  • Services supporting rolling patch installation or uninstallation: All businesses or part of them (varying depending on different services) of the services are not interrupted during patch installation or uninstallation.
  • Services not supporting rolling patch installation or uninstallation: Businesses of the services are interrupted during patch installation or uninstallation.
  • Services with some roles supporting rolling patch installation or uninstallation: Some businesses of the services are not interrupted during patch installation or uninstallation.

Note

In MRS 3.x, you cannot perform operations in this section on the management console.

Table 1 <mrs_01_0431__table054720341161> provides services and instances that support or do not support rolling restart in the MRS cluster.

Table 1 Services and instances that support or do not support rolling restart
Service Instance Whether to Support Rolling Restart
HDFS

NameNode Zkfc JournalNode HttpFS DataNode

Yes
Yarn

ResourceManager NodeManager

Yes
Hive

MetaStore WebHCat HiveServer

Yes
MapReduce JobHistoryServer Yes
HBase

HMaster RegionServer ThriftServer RESTServer

Yes
Spark

JobHistory JDBCServer

Yes
SparkResource No
Hue Hue No
Tez TezUI No
Loader Sqoop No
Zookeeper Quorumpeer Yes
Kafka Broker Yes
MirrorMaker No
Flume

Flume MonitorServer

Yes
Storm

Nimbus UI Supervisor LogViewer

Yes

Installing a Patch

  1. Log in to the MRS console.

  2. Choose Clusters > Active Clusters and click the name of the cluster to be queried to enter the page displaying the cluster's basic information.

  3. On the Patches page, click Install in the Operation column.

  4. On the Warning page, enable or disable Rolling Patch.

    Note

    • Enabling the rolling patch installation function: Services are not stopped before patch installation, and rolling service restart is performed after the patch installation. This minimizes the impact on cluster services but takes more time than common patch installation.
    • Disabling the rolling patch uninstallation function: All services are stopped before patch uninstallation, and all services are restarted after the patch uninstallation. This temporarily interrupts the cluster and the services but takes less time than rolling patch uninstallation.
    • The rolling patch installation function is not available in clusters with less than two Master nodes and three Core nodes.

  5. Click Yes to install the target patch.

  6. View the patch installation progress.

    1. Access MRS Manager. For details, see Accessing MRS Manager MRS 2.1.0 or Earlier) <mrs_01_0102>.
    2. Choose System > Manage Patch. On the Manage Patch page, you can view the patch installation progress.

    Note

    For the isolated host nodes in the cluster, follow instructions in Restoring Patches for the Isolated Hosts <mrs_01_0412> to restore the patch.

Uninstalling a Patch

  1. Log in to the MRS console.

  2. Choose Clusters > Active Clusters and click the name of the cluster to be queried to enter the page displaying the cluster's basic information.

  3. On the Patches page, click Uninstall in the Operation column.

  4. On the Warning page, enable or disable Rolling Patch.

    Note

    • Enabling the rolling patch uninstallation function: Services are not stopped before patch uninstallation, and rolling service restart is performed after the patch uninstallation. This minimizes the impact on cluster services but takes more time than common patch uninstallation.
    • Disabling the rolling patch uninstallation function: All services are stopped before patch uninstallation, and all services are restarted after the patch uninstallation. This temporarily interrupts the cluster and the services but takes less time than rolling patch uninstallation.
    • Only patches that are installed in rolling mode can be uninstalled in the same mode.

  5. Click Yes to uninstall the target patch.

  6. View the patch uninstallation progress.

    1. Access MRS Manager. For details, see Accessing MRS Manager MRS 2.1.0 or Earlier) <mrs_01_0102>.
    2. Choose System > Manage Patch. On the Manage Patch page, you can view the patch uninstallation progress.

    Note

    For the isolated host nodes in the cluster, follow instructions in Restoring Patches for the Isolated Hosts <mrs_01_0412> to restore the patch.