Weiwei Yang created HDFS-12506:
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Summary: Ozone: ListBucket is too slow
Key: HDFS-12506
URL: https://issues.apache.org/jira/browse/HDFS-12506
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ozone
Reporter: Weiwei Yang
Assignee: Weiwei Yang
Priority: Blocker
Generated 3 million keys in ozone, and run {{listBucket}} command to get a list
of buckets under a volume,
{code}
bin/hdfs oz -listBucket http://15oz1.fyre.ibm.com:9864/vol-0-15143 -user wwei
{code}
this call spent over *15 seconds* to finish. The problem was caused by the
inflexible structure of KSM DB. Right now {{ksm.db}} stores keys like following
{code}
/v1/b1
/v1/b1/k1
/v1/b1/k2
/v1/b1/k3
/v1/b2
/v1/b2/k1
/v1/b2/k2
/v1/b2/k3
/v1/b3
/v1/b4
{code}
keys are sorted in nature order so when we do list buckets under a volume e.g
/v1, we need to seek to /v1 point and start to iterate and filter keys, this
ends up with scanning all keys under volume /v1. The problem with this design
is we don't have an efficient approach to locate all buckets without scanning
the keys.
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