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
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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