Xiao Chen created HDFS-14039:
--------------------------------
Summary: ec -listPolicies doesn't show correct state for the
default policy when the default is not RS(6,3)
Key: HDFS-14039
URL: https://issues.apache.org/jira/browse/HDFS-14039
Project: Hadoop HDFS
Issue Type: Bug
Components: erasure-coding
Affects Versions: 3.0.0
Reporter: Xiao Chen
Assignee: Kitti Nanasi
{noformat}
$ 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=ENABLED
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 ec -enablePolicy -policy XOR-2-1-1024k
Erasure coding policy XOR-2-1-1024k is enabled
$ 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=ENABLED
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=ENABLED
----------------------------------
$ #set default to be RS-3-2 for dfs.namenode.ec.system.default.policy, and
restart NN
(this seems to be what's triggering the failure)
-----------------------------------
$ 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=ENABLED
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=ENABLED
$ hdfs ec -enablePolicy -policy RS-3-2-1024k
Erasure coding policy RS-3-2-1024k is enabled
$ 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=ENABLED
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=ENABLED
{noformat}
The last 2 should show RS-3-2 as ENABLED. RS-6-3 DISABLED if it's not enabled
before.
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