Null pointer exception in HBaseClient receiveResponse
-----------------------------------------------------
Key: HBASE-4980
URL: https://issues.apache.org/jira/browse/HBASE-4980
Project: HBase
Issue Type: Bug
Components: client
Affects Versions: 0.92.0
Reporter: Shrijeet Paliwal
Relevant Stack trace:
2011-11-30 13:10:26,557 [IPC Client (47) connection to
xx.xx.xx/172.22.4.68:60020 from an unknown user] WARN
org.apache.hadoop.ipc.HBaseClient - Unexpected exception receiving call
responses
java.lang.NullPointerException
>-at
>org.apache.hadoop.hbase.ipc.HBaseClient$Connection.receiveResponse(HBaseClient.java:583)
>-at
>org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:511)
{code}
if (LOG.isDebugEnabled())
LOG.debug(getName() + " got value #" + id);
Call call = calls.remove(id);
// Read the flag byte
byte flag = in.readByte();
boolean isError = ResponseFlag.isError(flag);
if (ResponseFlag.isLength(flag)) {
// Currently length if present is unused.
in.readInt();
}
int state = in.readInt(); // Read the state. Currently unused.
if (isError) {
//noinspection ThrowableInstanceNeverThrown
call.setException(new RemoteException( WritableUtils.readString(in),
WritableUtils.readString(in)));
} else {
{code}
This line {code}Call call = calls.remove(id);{code} may return a null 'call'.
It is so because if you have rpc timeout enable, we proactively clean up other
calls which have expired their lifetime along with the call for which socket
timeout exception happend.
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