[ https://issues.apache.org/jira/browse/HDFS-12506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Weiwei Yang updated HDFS-12506: ------------------------------- Labels: ozoneMerge performance (was: ozoneMerge) > 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 > Priority: Blocker > Labels: ozoneMerge, performance > > 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-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org