Manage groups and nodes

Background

When multiple users or services share a Lindorm cluster, they can compete for resources. In particular, offline batch reads and writes can affect critical online reads and writes. Lindorm's group feature addresses this issue by isolating workloads. As shown in the diagram, create Group1 and assign RegionServer1 and RegionServer2 to it, then create Group2 and assign RegionServer3 and RegionServer4 to it. Move Table1 and Table2 to Group1; all their Regions are assigned only to RegionServer1 and RegionServer2. Similarly, all Regions for Table3 and Table4 are assigned only to RegionServer3 and RegionServer4 in Group2. Therefore, requests for Table1 and Table2 are served only by RegionServer1 and RegionServer2, while requests for Table3 and Table4 are served only by RegionServer3 and RegionServer4. This isolates resources across workloads.

Prerequisites

You are logged on to the cluster management system for the target instance. For more information, see Log on to the cluster management system.

View groups

1. In the left-side navigation pane of the cluster management system, choose Cluster Management > Manage groups and nodes.

2. At the bottom of the page, you can view information about all groups in the cluster.

   Note

   If you have not created any groups, the system creates a default group named default. All RegionServers and tables belong to this group.

   On the Group and Node Overview page, filter results by IDC, Group, or Node from the filter bar and click Query. The table displays node metrics such as Read requests/s, Write requests/s, Replicated write traffic/s, Total Shards, Read data (KB/s), Average read RT (ms), Write data (KB/s), and Average write RT, along with the Group each node belongs to. In the Actions column, click More to view additional details.

Create a group

1. In the left-side navigation pane of the cluster management system, choose Cluster Management > Manage groups and nodes.

2. In the upper-right corner of the page, click +Add.

3. In the Create Group dialog box, enter a value in the Group Name field.

4. Click Determine.

   Note

   After you create a group, its server and table counts are both 0. You must move the required servers and tables into the group.

Delete a group

1. In the left-side navigation pane of the cluster management system, choose Cluster Management > Manage groups and nodes.

2. In the Operation column for the target group, choose More > Delete.

3. In the dialog box, click Determine.

View basic instance/cluster information

1. In the left-side navigation pane of the cluster management system, choose Cluster Management > Manage groups and nodes.

2. In the Basic Instance/Cluster Information section, you can view information such as the database type and the IDC where the database is deployed.

3. On the right, click More > Read/Write Control to adjust the read/write permissions for the current instance or cluster.

Move a RegionServer

1. In the left-side navigation pane of the cluster management system, choose Cluster Management > Manage groups and nodes.

2. Find the target node. In its Actions column, choose More > Move Group.

3. In the Move Group dialog box, select a Destination Group.

4. Click Determine.

Move a table

1. On the Overview page, click Move Group in the Operation column. In the HBase table management list, find the target table (such as test1), and click Move Group in its Actions column.

2. In the Move Group dialog box, select a Destination Group.

3. Click Determine.