Xiao Chen created HDFS-12682:
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Summary: ECAdmin -listPolicies will always show policy state as
DISABLED
Key: HDFS-12682
URL: https://issues.apache.org/jira/browse/HDFS-12682
Project: Hadoop HDFS
Issue Type: Bug
Components: erasure-coding
Reporter: Xiao Chen
Assignee: Xiao Chen
On a real cluster, {{hdfs ec -listPolicies}} will always show policy state as
DISABLED.
{noformat}
[hdfs@nightly6x-1 root]$ hdfs ec -listPolicies
Erasure Coding Policies:
ErasureCodingPolicy=[Name=RS-10-4-1024k, Schema=[ECSchema=[Codec=rs,
numDataUnits=10, numParityUnits=4]], CellSize=1048576, Id=5, State=DISABLED]
ErasureCodingPolicy=[Name=RS-3-2-1024k, Schema=[ECSchema=[Codec=rs,
numDataUnits=3, numParityUnits=2]], CellSize=1048576, Id=2, State=DISABLED]
ErasureCodingPolicy=[Name=RS-6-3-1024k, Schema=[ECSchema=[Codec=rs,
numDataUnits=6, numParityUnits=3]], CellSize=1048576, Id=1, State=DISABLED]
ErasureCodingPolicy=[Name=RS-LEGACY-6-3-1024k,
Schema=[ECSchema=[Codec=rs-legacy, numDataUnits=6, numParityUnits=3]],
CellSize=1048576, Id=3, State=DISABLED]
ErasureCodingPolicy=[Name=XOR-2-1-1024k, Schema=[ECSchema=[Codec=xor,
numDataUnits=2, numParityUnits=1]], CellSize=1048576, Id=4, State=DISABLED]
[hdfs@nightly6x-1 root]$ hdfs ec -getPolicy -path /ecec
XOR-2-1-1024k
{noformat}
This is because when [deserializing
protobuf|https://github.com/apache/hadoop/blob/branch-3.0.0-beta1/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelperClient.java#L2942],
the static instance of [SystemErasureCodingPolicies
class|https://github.com/apache/hadoop/blob/branch-3.0.0-beta1/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/SystemErasureCodingPolicies.java#L101]
is first checked, and always returns the cached policy objects, which are
created by default with state=DISABLED.
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