Help Center/ MapReduce Service/ User Guide/ Managing Clusters/ Patch Management/ Installing a Rolling Patch
Updated on 2024-04-11 GMT+08:00
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Installing a Rolling Patch

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.

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

Table 1 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

Support Rolling Restart

Alluxio

AlluxioJobMaster

Yes

AlluxioMaster

ClickHouse

ClickHouseServer

Yes

ClickHouseBalancer

CDL

CDLConnector

Yes

CDLService

Flink

FlinkResource

No

FlinkServer

Flume

Flume

Yes

MonitorServer

Guardian

TokenServer

Yes

HBase

HMaster

Yes

RegionServer

ThriftServer

RESTServer

HetuEngine

HSBroker

Yes

HSConsole

HSFabric

QAS

HDFS

NameNode

Yes

Zkfc

JournalNode

HttpFS

DataNode

Hive

MetaStore

Yes

WebHCat

HiveServer

Hue

Hue

No

Impala

Impalad

No

StateStore

Catalog

IoTDB

IoTDBServer

Yes

Kafka

Broker

Yes

KafkaUI

No

Kudu

KuduTserver

Yes

KuduMaster

Loader

Sqoop

No

MapReduce

JobHistoryServer

Yes

Oozie

oozie

No

Presto

Coordinator

Yes

Worker

Ranger

RangerAdmin

Yes

UserSync

TagSync

Spark

JobHistory

Yes

JDBCServer

SparkResource

Storm

Nimbus

Yes

UI

Supervisor

Logviewer

Tez

TezUI

No

Yarn

ResourceManager

Yes

NodeManager

Zookeeper

Quorumpeer

Yes

Installing a Rolling 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.

    Figure 1 Rolling patch installation
    • 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.x or Earlier).
    2. Choose System > Manage Patch. On the Manage Patch page, you can view the patch installation progress.

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

Uninstalling a Rolling 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.

    Figure 2 Rolling patch uninstallation
    • 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.x or Earlier).
    2. Choose System > Manage Patch. On the Manage Patch page, you can view the patch uninstallation progress.

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

Parent topic: Patch Management