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Symptom:

The oldWALs directory stores WALs that are no longer needed for recovery. We have come across situations where the directory continually increases in size and the older WALs are not getting cleaned up.

Root Cause:

This can get filled up due to a bug where hbase.backup.enable is true by default in HDP-2.5.3

Resolution:

- Add the property to HBase Custom hbase-site:

hbase.backup.enable=false
- Restart HBase
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