[Impala-ASF-CR] IMPALA-13518: Show target name of COMMIT TXN events in logs

["Quanlong Huang (Code Review)" <ge...@cloudera.org>]

Hello Michael Smith, Impala Public Jenkins, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/22036

to look at the new patch set (#2).

Change subject: IMPALA-13518: Show target name of COMMIT_TXN events in logs
......................................................................

IMPALA-13518: Show target name of COMMIT_TXN events in logs

The message of a COMMIT_TXN event just contains the transaction id
(txnid). In the logs of top-10 expensive events and top-10 targets that
contribute to the lag, we show the target as CLUSTER_WIDE.

However, when processing the events, catalogd actually finds
the involved tables and reloads them. It'd be helpful to show the names
of the tables involved in the transaction.

This patch overrides the getTargetName() method in CommitTxnEvent to
show the table names. They are collected after the event is processed.

Tests:
 - Add tests in MetastoreEventsProcessorTest

Change-Id: I4a7cb5e716453290866a4c3e74c0d269f621144f
---
M fe/src/compat-hive-3/java/org/apache/impala/compat/MetastoreShim.java
M fe/src/main/java/org/apache/impala/catalog/events/MetastoreEvents.java
M fe/src/test/java/org/apache/impala/catalog/events/MetastoreEventsProcessorTest.java
3 files changed, 117 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/36/22036/2
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I4a7cb5e716453290866a4c3e74c0d269f621144f
Gerrit-Change-Number: 22036
Gerrit-PatchSet: 2
Gerrit-Owner: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Michael Smith <mi...@cloudera.com>