[
https://issues.apache.org/jira/browse/HDFS-8718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15268067#comment-15268067
]
He Xiaoqiao commented on HDFS-8718:
-----------------------------------
i met the same problem after upgraded the cluster to 2.7.1, and never config
ARCHIVE storage policy.
{code:xml}
2016-04-19 10:20:48,083 WARN
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy: Failed to
place enough replicas, still in need of 7 to reach 10 (unavailableStorages=[],
storagePolicy=BlockStoragePolicy{HOT:7, storageTypes=[DISK],
creationFallbacks=[], replicationFallbacks=[ARCHIVE]}, newBlock=false) For more
information, please enable DEBUG log level on
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy
...
2016-04-19 10:21:17,184 WARN
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy: Failed to
place enough replicas, still in need of 7 to reach 10
(unavailableStorages=[DISK], storagePolicy=BlockStoragePolicy{HOT:7,
storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]},
newBlock=false) For more information, please enable DEBUG log level on
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy
2016-04-19 10:21:17,184 WARN
org.apache.hadoop.hdfs.protocol.BlockStoragePolicy: Failed to place enough
replicas: expected size is 7 but only 0 storage types can be selected
(replication=10, selected=[], unavailable=[DISK, ARCHIVE], removed=[DISK, DISK,
DISK, DISK, DISK, DISK, DISK], policy=BlockStoragePolicy{HOT:7,
storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]})
2016-04-19 10:21:17,184 WARN
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy: Failed to
place enough replicas, still in need of 7 to reach 10
(unavailableStorages=[DISK, ARCHIVE], storagePolicy=BlockStoragePolicy{HOT:7,
storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]},
newBlock=false) All required storage types are unavailable:
unavailableStorages=[DISK, ARCHIVE], storagePolicy=BlockStoragePolicy{HOT:7,
storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]}
{code}
above NN log is all about ReplicationMonitor process one {{ReplicationWork}},
it depicts that {{ReplicationWork}} can not choose any proper targets which
StorageType should be DISK although traverse all DN of the Cluster. then
{{DISK}} is added to {{unavailableStorages}}, the next loop {{ARCHIVE}} is
added to {{unavailableStorages}} because there is no ARCHIVE storage. After
that throw NotEnoughReplicasException.
The core Question is *WHY it can NOT choose any proper datanode as target in
{{ReplicationWork}} successfully, even if there are thousand DNs in the
cluster*.
> Block replicating cannot work after upgrading to 2.7
> -----------------------------------------------------
>
> Key: HDFS-8718
> URL: https://issues.apache.org/jira/browse/HDFS-8718
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Bing Jiang
>
> Decommission a datanode from hadoop, and hdfs can calculate the correct
> number of blocks to be replicated from web-ui.
> {code}
> Decomissioning
> Node Last contact Under replicated blocks Blocks with no live replicas
> Under Replicated Blocks
> In files under construction
> TS-BHTEST-03:50010 (172.22.49.3:50010) 25641 0 0
> {code}
> From NN's log, the work of block replicating cannot be enforced due to
> inconsistent expected storage type.
> {code}
> Node /default/rack_02/172.22.49.5:50010 [
> Storage
> [DISK]DS-3915533b-4ae4-4806-bf83caf1446f1e2f:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-3e54c331-3eaf-4447-b5e4-9bf91bc71b17:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-d44fa611-aa73-4415-a2de-7e73c9c5ea68:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-cebbf410-06a0-4171-a9bd-d0db55dad6d3:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-4c50b1c7-eaad-4858-b476-99dec17d68b5:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-f6cf9123-4125-4234-8e21-34b12170e576:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-7601b634-1761-45cc-9ffd-73ee8687c2a7:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-1d4b91ab-fe2f-4d5f-bd0a-57e9a0714654:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-cd2279cf-9c5a-4380-8c41-7681fa688eaf:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-630c734f-334a-466d-9649-4818d6e91181:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> Storage
> [DISK]DS-31cd0d68-5f7c-4a0a-91e6-afa53c4df820:NORMAL:172.22.49.5:50010 is not
> chosen since storage types do not match, where the required storage type is
> ARCHIVE.
> ]
> 2015-07-07 16:00:22,032 WARN
> org.apache.hadoop.hdfs.protocol.BlockStoragePolicy: Failed to place enough
> replicas: expected size is 1 but onl
> y 0 storage types can be selected (replication=3, selected=[],
> unavailable=[DISK, ARCHIVE], removed=[DISK], policy=BlockStoragePolicy{HOT:7,
> storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]})
> 2015-07-07 16:00:22,032 WARN
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy: Failed to
> place enough replicas, still in n
> eed of 1 to reach 3 (unavailableStorages=[DISK, ARCHIVE],
> storagePolicy=BlockStoragePolicy{HOT:7, storageTypes=[DISK],
> creationFallbacks=[],
> replicationFallbacks=[ARCHIVE]}, newBlock=false) All required storage types
> are unavailable: unavailableStorages=[DISK, ARCHIVE], storageP
> olicy=BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[],
> replicationFallbacks=[ARCHIVE]}
> {code}
> We have upgraded the hadoop cluster from 2.5 to 2.7.0 previously. I believe
> the feature of ARCHIVE STORAGE has been enforced, but how about the block's
> storage type after upgrading?
> The default BlockStoragePolicy is hot, and I guess those blocks do not have
> the correct information bit of BlockStoragePolicy, so it cannot be handled
> well.
> After I shutdown the datanode, the under-replicated blocks can be asked to
> copy. So the workaround is to shutdown the datanode.
> Could anyone take a look at the issue?
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