Walter Su created HDFS-8594:
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Summary: Erasure Coding: cache ErasureCodingZone
Key: HDFS-8594
URL: https://issues.apache.org/jira/browse/HDFS-8594
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Walter Su
Assignee: Walter Su
scenario 1:
We have 100m files in a EC zone. Everytime we open a file, we need to get
ECSchema(need get ECZone first). So getting EC zone is frequent.
scenario 2:
We have a EC zone "/d1". We have a file in "/d1/d2/d3/.../dN". We have to
search from xAttrs from dN, dN-1, ..., d3, d2, d1, until we find a EC zone from
d1's xAttr.
It's better we cache the EC zone, like EncryptionZoneManager#encryptionZones
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