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Posted to user@hadoop.apache.org by Hendrik Haddorp <he...@gmx.net> on 2017/11/27 16:57:39 UTC
HDFS block replication problem
Hi,
I have a HDFS test cluster with 7 data nodes and one name node. During
write operations from Solr I get errors on the client side and messages
like this in the name node logs:
017-11-27 11:16:09,130 DEBUG
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy:
Failed to choose from the next rack (location = /default/rack_02), retry
choosing ramdomly
I also have entries like this:
2017-11-27 11:16:09,129 DEBUG
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy:
Failed to choose from local rack (location = /default/rack_01), retry
with the rack of the next replica (location = /default/rack_02)
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy$NotEnoughReplicasException:
[
Node /default/rack_01/10.37.131.184:50010 [
Storage
[DISK]DS-35c4ec83-f26f-44fb-a3be-21baf037357e:NORMAL:10.37.131.184:50010
is not chosen since the node does not have enough DISK space
(required=134217728, scheduled=14495514624, remaining=14205731794).
]
This seems to indicate that the disk on the data node is full. However
when running "hdfs dfsadmin -report" I get the following for that node:
Name: 10.37.131.184:50010 (..........)
Hostname: ................
Rack: /default/rack_01
Decommission Status : Normal
Configured Capacity: 47766564864 (44.49 GB)
DFS Used: 4933282704 (4.59 GB)
Non DFS Used: 14173148272 (13.20 GB)
DFS Remaining: 28660133888 (26.69 GB)
DFS Used%: 10.33%
DFS Remaining%: 60.00%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Mon Nov 27 11:52:59 EST 2017
According to that that should be plenty of space left. The web UI also
reports:
Admin State Capacity Used Non DFS Used Remaining Blocks
Block pool used Failed Volumes Version
In Service 44.49 GB 4.59 GB 13.17 GB 26.72 GB
176852 4.59 GB (10.33%) 0 2.7.3
Would be great if somebody could explain why my disk is reported to be full.
thanks,
Hendrik
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