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https://issues.apache.org/jira/browse/HBASE-23376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sun Xin updated HBASE-23376:
----------------------------
Attachment: (was: HBASE-23376.branch-2.002.patch)
> 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
> Priority: Minor
> Attachments: HBASE-23376.branch-2.001.patch
>
>
> 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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