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https://issues.apache.org/jira/browse/HBASE-4890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221801#comment-13221801
]
Lars Hofhansl commented on HBASE-4890:
--------------------------------------
I agree, this is scary. I too will some debugging on 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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