[jira] [Created] (HBASE-26437) [hboss] Rename does not clean up znodes for src location

["Josh Elser (Jira)" <ji...@apache.org>]

Josh Elser created HBASE-26437:
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             Summary: [hboss] Rename does not clean up znodes for src location
                 Key: HBASE-26437
                 URL: https://issues.apache.org/jira/browse/HBASE-26437
             Project: HBase
          Issue Type: Bug
          Components: hboss
    Affects Versions: hbase-filesystem-1.0.0-alpha1
            Reporter: Josh Elser
            Assignee: Josh Elser


We ran into a fun situation where the partition hosting ZK data was repeatedly filling up while heavy ExportSnapshot+clone_snapshot operations were running (10's of TB). The cluster was previously working just fine.

Upon investigation of the ZK tree, we found a large number of znodes beneath /hboss, specifically many in the corresponding ZK HBOSS path for $hbase.rootdir/.tmp.

Tracing back from the code, we saw that the CloneSnapshotProcedure (like CreateTableProcedure) will create the table filesystem layout in $hbase.rootdir/.tmp and then rename it into $hbase.rootdir/data/<namespace>. However, it appears that, upon rename, HBOSS was not cleaning up the src path's znode. This is a bug as it allows ZK to grow unbounded (which explains why this problem slowly arose and not suddenly).

As a workaround, HBase can be stopped and the corresponding ZK path for $hbase.rootdir/.tmp can be cleaned up to reclaim 1/2 the space taken up by znodes for imported hbase tables (we would still have znodes for $hbase.rootdir/data/...)



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