Chen Liang created HDFS-11886:
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Summary: Ozone : improving error handling for putkey operation
Key: HDFS-11886
URL: https://issues.apache.org/jira/browse/HDFS-11886
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ozone
Reporter: Chen Liang
Ozone's putKey operations involve a couple steps:
1. KSM calls allocateBlock to SCM, writes this info to KSM's local metastore
2. allocatedBlock gets returned to client, client checks to see if container
needs to be created on datanode, if yes, create the container
3. writes the data to container.
it is possible that 1 succeeded, but 2 or 3 failed, in this case there will be
an entry in KSM's local metastore, but the key is actually nowhere to be found.
We need to revert 1 is 2 or 3 failed in this case. This can be done with a
deleteKey() call to KSM.
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