[ https://issues.apache.org/jira/browse/ACCUMULO-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16114657#comment-16114657 ]
Mike Drob commented on ACCUMULO-4692: ------------------------------------- I thought we had a JIRA to add close to scans in 2.0? > CompactionDriver leaves abandoned metadata scans > ------------------------------------------------ > > Key: ACCUMULO-4692 > URL: https://issues.apache.org/jira/browse/ACCUMULO-4692 > Project: Accumulo > Issue Type: Bug > Components: fate > Reporter: Adam Fuchs > > We wrote a tool to kick off tablet compactions in the background while > minimizing compaction load per-server. The tool uses range compaction on one > tablet per call. We're seeing a high number of scans on the metadata table > (~7,000 on a ~100 node cluster). > The metadata query in the isReady() method of CompactionDriver that is used > to see if the compaction has completed uses a range that goes to the end of > the metadata entries for the given table, but it stops consuming the results > of the scanner at the end of the compaction range. isReady gets called in a > pretty tight loop, especially with hundreds of compactions running > concurrently. Seems like we should limit the scan to the metadata range > associated with the compaction so that the scan can get cleaned up quickly. -- This message was sent by Atlassian JIRA (v6.4.14#64029)