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From "Ankit Singhal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-4010) Hash Join cache may not be send to all regionservers when we have stale HBase meta cache
Date Tue, 11 Jul 2017 14:28:09 GMT
Ankit Singhal created PHOENIX-4010:
--------------------------------------

             Summary: Hash Join cache may not be send to all regionservers when we have stale
HBase meta cache
                 Key: PHOENIX-4010
                 URL: https://issues.apache.org/jira/browse/PHOENIX-4010
             Project: Phoenix
          Issue Type: Bug
            Reporter: Ankit Singhal
            Assignee: Ankit Singhal
             Fix For: 4.12.0


 If the region locations changed and our HBase meta cache is not updated then we might not
be sending hash join cache to all region servers hosting the regions.
ConnectionQueryServicesImpl#getAllTableRegions
{code}
boolean reload =false;
        while (true) {
            try {
                // We could surface the package projected HConnectionImplementation.getNumberOfCachedRegionLocations
                // to get the sizing info we need, but this would require a new class in the
same package and a cast
                // to this implementation class, so it's probably not worth it.
                List<HRegionLocation> locations = Lists.newArrayList();
                byte[] currentKey = HConstants.EMPTY_START_ROW;
                do {
                    HRegionLocation regionLocation = connection.getRegionLocation(
                            TableName.valueOf(tableName), currentKey, reload);
                    locations.add(regionLocation);
                    currentKey = regionLocation.getRegionInfo().getEndKey();
                } while (!Bytes.equals(currentKey, HConstants.EMPTY_END_ROW));
                return locations;
{code}

Skipping duplicate servers in ServerCacheClient#addServerCache

{code}
List<HRegionLocation> locations = services.getAllTableRegions(cacheUsingTable.getPhysicalName().getBytes());
            int nRegions = locations.size();
            
.....

 if ( ! servers.contains(entry) && 
                        keyRanges.intersectRegion(regionStartKey, regionEndKey,
                                cacheUsingTable.getIndexType() == IndexType.LOCAL)) {  
                    // Call RPC once per server
                    servers.add(entry);
{code}

For eg:- Table ’T’ has two regions R1 and R2 originally hosted on regionserver RS1. 

while Phoenix/Hbase connection is still active, R2 is transitioned to RS2 ,  but stale meta
cache will still give old region locations i.e R1 and R2 on RS1 and when we start copying
hash table, we copy for R1 and skip R2 as they are hosted on same regionserver. so, the query
on a table will fail as it will unable to find hash table cache on RS2 for processing regions
R2.





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