[jira] [Created] (HBASE-23376) NPE happens while replica region is moving

["Sun Xin (Jira)" <ji...@apache.org>]

Sun Xin created HBASE-23376:
-------------------------------

             Summary: NPE happens while replica region is moving
                 Key: HBASE-23376
                 URL: https://issues.apache.org/jira/browse/HBASE-23376
             Project: HBase
          Issue Type: Bug
          Components: read replicas
            Reporter: Sun Xin
            Assignee: Sun Xin


The following code is from AsyncNonMetaRegionLocator#addToCache

 
{code:java}
private RegionLocations addToCache(TableCache tableCache, RegionLocations locs) {
  LOG.trace("Try adding {} to cache", locs);
  byte[] startKey = locs.getDefaultRegionLocation().getRegion().getStartKey();
  ...
}{code}
 

we will get a NPE if the locs is without the default region.

 

The following code is from AsyncRegionLocatorHelper#updateCachedLocationOnError

 
{code:java}
...
if (cause instanceof RegionMovedException) {
  RegionMovedException rme = (RegionMovedException) cause;
  HRegionLocation newLoc =
    new HRegionLocation(loc.getRegion(), rme.getServerName(), rme.getLocationSeqNum());
  LOG.debug("Try updating {} with the new location {} constructed by {}", loc, newLoc,
    rme.toString());
  addToCache.accept(newLoc);
...{code}
If the replica region is moving, we will get a RegionMovedException and add the HRegionLocation of replica region to cache. And finally NPE happens.

 

 
{code:java}
java.lang.NullPointerExceptionjava.lang.NullPointerException at org.apache.hadoop.hbase.client.AsyncNonMetaRegionLocator.addToCache(AsyncNonMetaRegionLocator.java:240) at org.apache.hadoop.hbase.client.AsyncNonMetaRegionLocator.addLocationToCache(AsyncNonMetaRegionLocator.java:596) at org.apache.hadoop.hbase.client.AsyncRegionLocatorHelper.updateCachedLocationOnError(AsyncRegionLocatorHelper.java:80) at org.apache.hadoop.hbase.client.AsyncNonMetaRegionLocator.updateCachedLocationOnError(AsyncNonMetaRegionLocator.java:610) at org.apache.hadoop.hbase.client.AsyncRegionLocator.updateCachedLocationOnError(AsyncRegionLocator.java:153)
{code}



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