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Date: Fri, 4 Nov 2016 03:01:58 +0000 (UTC)
From: "chenglei (JIRA)" <jira@apache.org>
To: dev@phoenix.apache.org
Message-ID: <JIRA.12999277.1471968794000.183605.1478228518471@Atlassian.JIRA>
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References: <JIRA.12999277.1471968794000@Atlassian.JIRA> <JIRA.12999277.1471968794980@arcas>
Subject: [jira] [Updated] (PHOENIX-3199) ServerCacheClient would send cache
 to all regions unnecessarily once it should send cache to the first region
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archived-at: Fri, 04 Nov 2016 03:02:00 -0000


     [ https://issues.apache.org/jira/browse/PHOENIX-3199?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

chenglei updated PHOENIX-3199:
------------------------------
    Attachment: PHOENIX-3199_v5.patch

> ServerCacheClient would send cache to all regions unnecessarily once it should send cache to the first region
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-3199
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3199
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.8.0
>            Reporter: chenglei
>         Attachments: PHOENIX-3199_v5.patch
>
>
> The issue is caused by the htable's coprocessorService method,the third parameter endKey is inclusive,not exclusive.When both  startKey and endKey are HConstants.EMPTY_START_ROW,the coprocessorService method may send callable to all regions:
> {code:borderStyle=solid} 
> coprocessorService(final Class<T> service,byte[] startKey, byte[] endKey, final Batch.Call<T,R> callable)
> {code}
> In the addServerCache method of  org.apache.phoenix.cache.ServerCacheClient  class, once the first region can pass the if test in line 174, because the startKey of the first region is HConstants.EMPTY_START_ROW, so the key  is also  HConstants.EMPTY_START_ROW in line 180. When we invoke the htable's coprocessorService method in line 189, the startKey and endKey(Inclusive) parameters are both HConstants.EMPTY_START_ROW,and  the htable's coprocessorService method internally  uses getKeysAndRegionsInRange method to locate 
>  [HConstants.EMPTY_START_ROW,HConstants.EMPTY_START_ROW] to all regions, so cache would be sent to all regions :
> {code:borderStyle=solid} 
> 170  for (HRegionLocation entry : locations) {
> 171               // Keep track of servers we've sent to and only send once
> 172                byte[] regionStartKey = entry.getRegionInfo().getStartKey();
> 173                byte[] regionEndKey = entry.getRegionInfo().getEndKey();
> 174               if ( ! servers.contains(entry) && 
> 175                        keyRanges.intersectRegion(regionStartKey, regionEndKey,
> 176                               cacheUsingTable.getIndexType() == IndexType.LOCAL)) {  
> 177                   // Call RPC once per server
> 178                   servers.add(entry);
> 179                    if (LOG.isDebugEnabled()) {LOG.debug(addCustomAnnotations("Adding cache entry to be sent for " + entry, connection));}
> 180                    final byte[] key = entry.getRegionInfo().getStartKey();
> 181                    final HTableInterface htable = services.getTable(cacheUsingTableRef.getTable().getPhysicalName().getBytes());
> 182                    closeables.add(htable);
> 183                    futures.add(executor.submit(new JobCallable<Boolean>() {
> 184                      
> 185                        @Override
> 186                        public Boolean call() throws Exception {
> 187                            final Map<byte[], AddServerCacheResponse> results;
> 188                            try {
> 189                                results = htable.coprocessorService(ServerCachingService.class, key, key, 
> 190                                            new Batch.Call<ServerCachingService, AddServerCacheResponse>() {
> {code}



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