Database Reference
In-Depth Information
machine causes the machine to become unresponsive, which also pre-
vents the datanode daemon from sending heartbeats.
◦
Decommissioning Nodes
: This link lists all the datanodes that are being
decommissioned.
◦
Number of Under-Replicated Blocks
: This represents the number of
blocks that have not replicated as per the replication factor configured in
the
hdfs-site.xml
file.
•
Namenode Journal Status
: The journal status provides location information of
the
fsimage
file and the state of the
edits
logfile. The following screenshot
shows the
NameNode Journal Status
section:
•
NameNode Storage
: The namenode storage table provides the location of the
fsimage
file along with the type of the location. In this case, it is
IMAGE_AND_EDITS
, which means the same location is used to store the
fsimage
file as well as the
edits
logfile. The other types of locations are
IMAGE
, which stores only the
fsimage
file and
EDITS
, which stores only the
edits
logfile. The following screenshot shows the
NameNode Storage
inform-
ation:
