- MRS Manager Operation Guide (Applicable to 2.x and Earlier Versions)
- Alarm Reference (Applicable to Versions Earlier Than MRS 3.x)
- ALM-14000 HDFS Service Unavailable
ALM-14000 HDFS Service Unavailable¶
Description¶
The system checks the service status of NameService every 30 seconds. This alarm is generated when the system considers that the HDFS service is unavailable because all the NameService services are abnormal.
This alarm is cleared when at least one NameService service is normal and the system considers that the HDFS service recovers.
Attribute¶
Alarm ID | Alarm Severity | Auto Clear |
---|---|---|
14000 | Critical | Yes |
Parameters¶
Parameter | Description |
---|---|
ServiceName | Specifies the service for which the alarm is generated. |
RoleName | Specifies the role for which the alarm is generated. |
HostName | Specifies the host for which the alarm is generated. |
Impact on the System¶
HDFS fails to provide services for HDFS service-based upper-layer components, such as HBase and MapReduce. As a result, users cannot read or write files.
Possible Causes¶
ZooKeeper is abnormal.
All NameService services are abnormal.
Procedure¶
Check the ZooKeeper status.
Go to the MRS cluster details page. On the Components tab page, check whether the health status of the ZooKeeper service is Good.
Note
For MRS 1.7.2 or earlier, log in to MRS Manager and click the Services tab.
Rectify the health status of the ZooKeeper service. For details, see ALM-13000 ZooKeeper Service Unavailable. Then check whether the health status of the ZooKeeper service is Good.
Wait 5 minutes and check whether the alarm is cleared.
If yes, no further action is required.
If no, go to 2.a.
Handle the NameService service exception alarm.
Go to the MRS cluster details page. On the Alarms page, check whether all NameService services have abnormal alarms.
Handle the abnormal NameService services following the instructions in ALM-14010 NameService Service Is Abnormal and check whether each NameService service exception alarm is cleared.
Wait 5 minutes and check whether the alarm is cleared.
If yes, no further action is required.
If no, go to 3.
Collect fault information.
On MRS Manager, choose System > Export Log.
Contact technical support engineers for help. For details, see technical support.
Reference¶
None