Weiwei Yang created HDFS-12506: ---------------------------------- 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. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-dev-h...@hadoop.apache.org