[jira] [Created] (HBASE-29221) ClientSideRegionScanner fails with NPE while trying to close mslab

["Michael Perez (Jira)" <ji...@apache.org>]

Michael Perez created HBASE-29221:
-------------------------------------

             Summary: ClientSideRegionScanner fails with NPE while trying to close mslab
                 Key: HBASE-29221
                 URL: https://issues.apache.org/jira/browse/HBASE-29221
             Project: HBase
          Issue Type: Bug
          Components: Client, Scanners
            Reporter: Michael Perez


 
{code:java}
java.io.IOException: java.lang.NullPointerException: Cannot invoke "org.apache.hadoop.hbase.regionserver.ChunkCreator.putbackChunks(java.util.Set)" because "this.chunkCreator" is null
at org.apache.hadoop.hbase.regionserver.HRegion.doClose(HRegion.java:1877)
at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:1626)
at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:1581)
at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:1564)
at org.apache.hadoop.hbase.client.ClientSideRegionScanner.close(ClientSideRegionScanner.java:133)
at{code}
The ChunkCreator for the MemStoreLab is only initialized for [real HBase region servers|https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/HBaseServerBase.java#L410-L431]. Instances of the ClientSideRegionScanner will never initialize the memstore which causes NPE at close time.

This issue was caused by the changes in HBASE-28401

This same issue surfaced in HBASE-28743. The fix for that issue was to disable the MemStoreLab for the TableSnapshotScanner ([PR master|https://github.com/apache/hbase/pull/6101/files], [PR branch 2|https://github.com/apache/hbase/pull/6110]). The issue still persists in cases where the ClientSideRegionScanner is used in any context other than as part of the TableSnapshotScanner.

The proposed solution for this issue is to update [the initialization|https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/client/ClientSideRegionScanner.java#L70] of the ClientSideRegionScanner to disable the MemStoreLab.



--
This message was sent by Atlassian Jira
(v8.20.10#820010)