a7bf006b51
The infomation is displayed in JSON format.For example:
{"lastTabletReportTime":"2020-05-28 15:29:01"}
49 lines
1.9 KiB
Markdown
49 lines
1.9 KiB
Markdown
---
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{
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"title": "SHOW BACKENDS",
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"language": "en"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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# SHOW BACKENDS
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## Description
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This statement is used to view BE nodes in the cluster
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Grammar:
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SHOW BACKENDS;
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Explain:
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1. LastStartTime indicates the last BE start-up time.
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2. LastHeartbeat represents the latest heartbeat.
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3. Alive indicates whether the node survives.
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4. System Decommissioned is true to indicate that the node is safely offline.
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5. Cluster Decommissioned is true to indicate that the node is rushing downline in the current cluster.
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6. TabletNum represents the number of fragments on the node.
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7. Data Used Capacity represents the space occupied by the actual user data.
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8. Avail Capacity represents the available space on the disk.
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9. Total Capacity represents total disk space. Total Capacity = AvailCapacity + DataUsedCapacity + other non-user data files take up space.
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10. UsedPct represents the percentage of disk usage.
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11. ErrMsg is used to display error messages when a heartbeat fails.
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12. Status is used to display some Status information about BE in JSON format, including the last time that BE reported it's tablet.
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## keyword
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SHOW, BACKENDS
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