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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4010) Hash Join cache may not be send to all regionservers when we have stale HBase meta cache
Date Thu, 07 Sep 2017 19:05:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16157453#comment-16157453
] 

ASF GitHub Bot commented on PHOENIX-4010:
-----------------------------------------

Github user JamesRTaylor commented on a diff in the pull request:

    https://github.com/apache/phoenix/pull/268#discussion_r137629055
  
    --- Diff: phoenix-core/src/it/java/org/apache/phoenix/end2end/BaseJoinIT.java ---
    @@ -30,14 +30,19 @@
     import java.util.Map;
     import java.util.regex.Pattern;
     
    +import org.apache.hadoop.hbase.HConstants;
    +import org.apache.phoenix.cache.ServerCacheClient;
    +import org.apache.phoenix.end2end.HashJoinCacheIT.InvalidateHashCacheRandomly;
    +import org.apache.phoenix.util.ReadOnlyProps;
     import org.apache.phoenix.util.SchemaUtil;
     import org.apache.phoenix.util.StringUtil;
     import org.junit.Before;
    +import org.junit.BeforeClass;
     
     import com.google.common.collect.ImmutableMap;
     import com.google.common.collect.Maps;
     
    -public abstract class BaseJoinIT extends ParallelStatsDisabledIT {
    +public abstract class BaseJoinIT extends BaseUniqueNamesOwnClusterIT {
    --- End diff --
    
    Can we keep BaseJoinIT derived from ParallelStatsDisabledIT? Otherwise, there's a lot
more mini clusters created which increases our end-to-end test time run more and more.
    
    If the reason is because you're adding InvalidateHashCacheRandomly, just add it instead
dynamically to the table created in your test. To prevent flapping, you need to poll until
you the descriptor matches what you've changed. See PartialIndexRebuilderIT.addWriteFailingCoprocessor()
for an example you can generalize and/or copy/paste.


> 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
>
>         Attachments: PHOENIX-4010.patch, PHOENIX-4010_v1.patch, PHOENIX-4010_v2.patch,
PHOENIX-4010_v2_rebased_1.patch, PHOENIX-4010_v2_rebased.patch
>
>
>  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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