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Date: Sat, 3 Mar 2012 17:01:57 +0000 (UTC)
From: "stack (Commented) (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-4890) fix possible NPE in
 HConnectionManager
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    [ https://issues.apache.org/jira/browse/HBASE-4890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221643#comment-13221643 ] 

stack commented on HBASE-4890:
------------------------------

This NPE is a bit too easy to manufacture.  Should we hold up 0.92.1 till fixed?  Can work on it monday?
                
> fix possible NPE in HConnectionManager
> --------------------------------------
>
>                 Key: HBASE-4890
>                 URL: https://issues.apache.org/jira/browse/HBASE-4890
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.0
>            Reporter: Jonathan Hsieh
>            Priority: Blocker
>             Fix For: 0.92.1
>
>
> I was running YCSB against a 0.92 branch and encountered this error message:
> {code}
> 11/11/29 08:47:16 WARN client.HConnectionManager$HConnectionImplementation: Failed all from region=usertable,user3917479014967760871,1322555655231.f78d161e5724495a9723bcd972f97f41., hostname=c0316.hal.cloudera.com, port=57020
> java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.NullPointerException
>         at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
>         at java.util.concurrent.FutureTask.get(FutureTask.java:83)
>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatchCallback(HConnectionManager.java:1501)
>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatch(HConnectionManager.java:1353)
>         at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:898)
>         at org.apache.hadoop.hbase.client.HTable.doPut(HTable.java:775)
>         at org.apache.hadoop.hbase.client.HTable.put(HTable.java:750)
>         at com.yahoo.ycsb.db.HBaseClient.update(Unknown Source)
>         at com.yahoo.ycsb.DBWrapper.update(Unknown Source)
>         at com.yahoo.ycsb.workloads.CoreWorkload.doTransactionUpdate(Unknown Source)
>         at com.yahoo.ycsb.workloads.CoreWorkload.doTransaction(Unknown Source)
>         at com.yahoo.ycsb.ClientThread.run(Unknown Source)
> Caused by: java.lang.RuntimeException: java.lang.NullPointerException
>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithoutRetries(HConnectionManager.java:1315)
>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$3.call(HConnectionManager.java:1327)
>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$3.call(HConnectionManager.java:1325)
>         at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:138)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> Caused by: java.lang.NullPointerException
>         at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:158)
>         at $Proxy4.multi(Unknown Source)
>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$3$1.call(HConnectionManager.java:1330)
>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$3$1.call(HConnectionManager.java:1328)
>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithoutRetries(HConnectionManager.java:1309)
>         ... 7 more
> {code}
> It looks like the NPE is caused by server being null in the MultiRespone call() method.
> {code}
>      public MultiResponse call() throws IOException {
>          return getRegionServerWithoutRetries(
>              new ServerCallable<MultiResponse>(connection, tableName, null) {
>                public MultiResponse call() throws IOException {
>                  return server.multi(multi);
>                }
>                @Override
>                public void connect(boolean reload) throws IOException {
>                  server =
>                    connection.getHRegionConnection(loc.getHostname(), loc.getPort());
>                }
>              }
>          );
> {code}

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