ALM-19026 Damaged WAL Files in HBase

Alarm Description

The system checks the hdfs://hacluster/hbase/corrupt directory on the HDFS of each HBase service every 120 seconds. This alarm is generated when there are WAL files in the /hbase/corrupt directory.

This alarm is cleared when the /hbase/corrupt directory does not exist or does not contain WAL files.

hdfs://hacluster indicates the name of the file system used by HBase, and /hbase indicates the root directory of HBase in the file system. You can log in to FusionInsight Manager, choose Cluster > Services > HBase and click Configuration. Search for fs.defaultFS and hbase.data.rootdir.

Alarm Attributes

Alarm ID	Alarm Severity	Alarm Type	Service Type	Auto Cleared
19026	Major	Error handling	HBase	Yes

Alarm Parameters

Type	Parameter	Description
Location Information	Source	Specifies the cluster for which the alarm is generated.
	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

If the data in the damaged file is not flushed to disks, the data will be lost. As a result, some data queried by the service is inconsistent.

Possible Causes

The WAL files are damaged.

Handling Procedure

Log in to FusionInsight Manager and choose O&M. In the navigation pane on the left, choose Alarm > Alarms. On the page that is displayed, locate the row containing the alarm whose Alarm ID is 19026, and view the service in Location.
Log in to the node where the HDFS clients are installed as the client installation user and run the following commands:

cd Client installation directory

source bigdata_env

kinit Component service user (If Kerberos authentication is disabled for the cluster (the cluster is in normal mode), skip this step.)
Run the following command to check the damaged WAL files and go to 4:

hdfs dfs -ls hdfs://hacluster/hbase/corrupt/*%2C*

Collect fault information.

On FusionInsight Manager, choose O&M. In the navigation pane on the left, choose Log > Download.
Expand the Service drop-down list, and select HBase for the target cluster.
Click the edit icon in the upper right corner, and set Start Date and End Date for log collection to 10 minutes ahead of and after the alarm generation time, respectively. Then, click Download.
Contact O&M engineers and provide the collected logs.