[IMPALA-1470] Client gets NullPointerException when catalog service is down

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Impala 2.0
• Fix Version/s: Impala 2.10.0
• Component/s: Catalog
• Labels: ramp-up
• Target Version: Product Backlog
• Assignee: Tianyi Wang
• Reporter: Henry Robinson
• Created: 14/Nov/14 20:40
• Updated: 17/Aug/17 00:22
• Resolved: 01/Aug/17 17:23

Description

Queries fail with a status indicating a NullPointerException occurred when the catalog service is not running.

Instead we should provide a more helpful error message, e.g. indicating that the daemon could not connect to the catalog service.

The workaround is to start the catalog service.

I1114 12:37:57.146244 21527 Frontend.java:797] analyze query explain select STRAIGHT_JOIN id from alltypes a join alltypes b on a.id = b.id
I1114 12:37:57.146703 21527 Frontend.java:746] Requesting prioritized load of table(s): functional.alltypes
I1114 12:37:57.147213 21527 thrift-util.cc:97] TSocket::open() connect() <Host: localhost Port: 26000>Connection refused
I1114 12:37:57.155485 21527 status.cc:44] Couldn't open transport for localhost:26000 (connect() failed: Connection refused)
    @     0x7f193dfec7be  (unknown)
    @     0x7f193c8cb9bd  (unknown)
    @     0x7f193c8cba3f  (unknown)
    @     0x7f193c361b29  (unknown)
    @     0x7f193c36140d  (unknown)
    @     0x7f193db8b0b2  (unknown)
    @     0x7f193db86951  (unknown)
    @     0x7f193db76f4f  (unknown)
    @     0x7f193bbf83c5  (unknown)
    @     0x7f193151aaf9  (unknown)
I1114 12:37:57.155498 21527 thrift-client.cc:55] Unable to connect to localhost:26000
E1114 12:37:57.155515 21527 fe-support.cc:287] Couldn't open transport for localhost:26000 (connect() failed: Connection refused)
I1114 12:37:57.155858 21527 jni-util.cc:177] java.lang.NullPointerException
	at com.cloudera.impala.service.Frontend.requestTblLoadAndWait(Frontend.java:749)
	at com.cloudera.impala.service.Frontend.analyzeStmt(Frontend.java:815)
	at com.cloudera.impala.service.Frontend.createExecRequest(Frontend.java:835)
	at com.cloudera.impala.service.JniFrontend.createExecRequest(JniFrontend.java:139)
I1114 12:37:57.172777 21527 status.cc:44] NullPointerException: null