Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/20877 )

Change subject: IMPALA-12687: Fix key conflicts in tracking in-flight catalog 
operations
......................................................................

IMPALA-12687: Fix key conflicts in tracking in-flight catalog operations

In-flight catalog operations are tracked in a map using query id as the
key. It's ok since catalog clients use 0 as the timeout by default (see
--catalog_client_rpc_timeout_ms), i.e. catalog RPCs never timeout, which
means each query will have at most one in-flight catalog RPC at a time.

However, in case catalog_client_rpc_timeout_ms is set to non-zero,
impalad could retry the catalog RPC when it's considered timed out. That
causes several in-flight catalog operations coming from the same query
(so using the same query-id as the map key).

To fix the key conflicts, this patch use the pair of (queryId, threadId)
as the key of the in-flight operations map. 'threadId' comes from the
thrift thread that handles the RPC so it's unique across different
retries.

Tests:
 - Add custom-cluster test to verify all retries are shown in the
   /operations page.

Change-Id: Icd94ac7532fe7f3d68028c2da82298037be706c4
Reviewed-on: http://gerrit.cloudera.org:8080/20877
Reviewed-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
---
M 
fe/src/main/java/org/apache/impala/catalog/monitor/CatalogOperationTracker.java
M tests/custom_cluster/test_web_pages.py
2 files changed, 136 insertions(+), 49 deletions(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Icd94ac7532fe7f3d68028c2da82298037be706c4
Gerrit-Change-Number: 20877
Gerrit-PatchSet: 6
Gerrit-Owner: Quanlong Huang <huangquanl...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <huangquanl...@gmail.com>
Gerrit-Reviewer: Tamas Mate <tma...@apache.org>
Gerrit-Reviewer: Wenzhe Zhou <wz...@cloudera.com>

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