Ethan Rose created HDDS-12206:
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Summary: Create an `ozone debug` command to run checks on all
replicas
Key: HDDS-12206
URL: https://issues.apache.org/jira/browse/HDDS-12206
Project: Apache Ozone
Issue Type: Improvement
Reporter: Ethan Rose
Add a command that can be used to check the state of all replicas in a portion
of the namespace. For example, something like {{ozone debug replicas verify
<URI>... [--checksums] [--metadata] [--padding]}} where:
* {{ozone debug replicas verify}} does one iteration through the namespace
provided in {{{}<URI>{}}}. It may use multiple threads to work through all the
keys.
* For each key under {{{}<URI>{}}}, the client does checks on all the replicas
based on the flags provided. At least one flag is required.
* Client uses the block info to checks on the replicas as specified by the
flags:
** {{{}--checksums{}}}: Download data from the datanode to do client side
checksum verification. Replaces the {{read-replicas}} commad.
** {{{}--padding{}}}: Check for EC missing padding. Replaces the
{{find-missing-padding}} command and is a no-op for non-EC keys.
** {{{}--metadata{}}}: Only check block existence by {{GetBlock}} calls to the
datanodes without downloading data.
More flags can be added as we come up with new checks that would be good to
have. The command should output results in json format grouped by key and the
results of the checks run. It may optionally omit results from keys with no
issues.
This would replace other {{ozone debug}} tools like {{find-missing-padding}}
and {{read-replicas.}}
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