Hello Bikramjeet Vig, Impala Public Jenkins, I'd like you to reexamine a change. Please visit
http://gerrit.cloudera.org:8080/11103 to look at the new patch set (#5). Change subject: IMPALA-7096: restore scanner thread memory heuristics ...................................................................... IMPALA-7096: restore scanner thread memory heuristics This restores some of the heuristics removed in IMPALA-4835 that can help scans from hitting OOM conditions. The heuristics are implemented at the query level rather than in each scan node in isolation. Introduce a ScannerMemLimiter class that belongs to the QueryState that tracks the amount of memory estimated to be consumed for all scanner threads running for the query on the current backend. Also check soft memory limits to see if scanner threads should be started or the current scanner thread should stop. The long-term plan is to switch to the MT scan node implementations. When that happens this code can be removed. In the meantime this code is imperfect but will help avoid OOM in many scenarios. Testing: Added regression tests for HDFS and Kudu where we previously could run out of memory with a low mem_limit. Change-Id: Ib9907fa8c4d2b0b85f67f4f160899c1c258ad82b --- M be/src/exec/hdfs-scan-node.cc M be/src/exec/hdfs-scan-node.h M be/src/exec/kudu-scan-node-base.h M be/src/exec/kudu-scan-node.cc M be/src/exec/kudu-scan-node.h M be/src/exec/scan-node.cc M be/src/exec/scan-node.h M be/src/runtime/CMakeLists.txt M be/src/runtime/query-state.cc M be/src/runtime/query-state.h A be/src/runtime/scanner-mem-limiter.cc A be/src/runtime/scanner-mem-limiter.h A testdata/workloads/functional-query/queries/QueryTest/hdfs-scanner-thread-mem-scaling.test A testdata/workloads/functional-query/queries/QueryTest/kudu-scan-mem-usage.test M tests/query_test/test_mem_usage_scaling.py 15 files changed, 439 insertions(+), 49 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/03/11103/5 -- To view, visit http://gerrit.cloudera.org:8080/11103 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: newpatchset Gerrit-Change-Id: Ib9907fa8c4d2b0b85f67f4f160899c1c258ad82b Gerrit-Change-Number: 11103 Gerrit-PatchSet: 5 Gerrit-Owner: Tim Armstrong <tarmstr...@cloudera.com> Gerrit-Reviewer: Bikramjeet Vig <bikramjeet....@cloudera.com> Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com> Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>