[FLINK-15007] Flink on YARN does not request required TaskExecutors in some cases

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.10.0
• Fix Version/s: 1.10.0
• Component/s: Runtime / Coordination, Runtime / Task
• Assignee: Unassigned
• Reporter: Aljoscha Krettek
• Created: 02/Dec/19 09:09
• Updated: 04/Dec/19 09:04
• Resolved: 04/Dec/19 09:04

Description

This was discovered while debugging FLINK-14834. In some cases Flink does not request new TaskExecutors even though new slots are requested. You can see this in some of the logs attached to FLINK-14834.

You can reproduce this using https://github.com/aljoscha/docker-hadoop-cluster to bring up a YARN cluster and then running a compiled Flink in there.

When you run

bin/flink run -m yarn-cluster -p 3 -yjm 1200 -ytm 1200 /root/DualInputWordCount.jar --input hdfs:///wc-in-1 --output hdfs:///wc-out && hdfs dfs -rm -r /wc-out

the job waits and eventually fails because it does not have enough slots. (You can see in the log that 3 new slots are requested but only 2 TaskExecutors are requested.

When you run

bin/flink run -m yarn-cluster -p 3 -yjm 1224 -ytm 1224 /root/DualInputWordCount.jar --input hdfs:///wc-in-1 --output hdfs:///wc-out && hdfs dfs -rm -r /wc-out

runs successfully.

This is the git bisect log that identifies the first faulty commit (https://github.com/apache/flink/commit/9fed0ddc5bc015f98246a2d8d9adbe5fb2b91ba4):

git bisect start
# good: [09f2f43a1d73c76bf4d3f4a1205269eb860deb14] [FLINK-14154][ml] Add the class for multivariate Gaussian Distribution.
git bisect good 09f2f43a1d73c76bf4d3f4a1205269eb860deb14
# bad: [85905f80e9711967711c2992612dccdd2cc211ac] [FLINK-14834][tests] Disable flaky yarn_kerberos_docker (default input) test
git bisect bad 85905f80e9711967711c2992612dccdd2cc211ac
# good: [c9c8a29b1b2e4f2886fba1524432f9788b564e61] [FLINK-14759][coordination] Remove unused class TaskManagerCliOptions
git bisect good c9c8a29b1b2e4f2886fba1524432f9788b564e61
# good: [c9c8a29b1b2e4f2886fba1524432f9788b564e61] [FLINK-14759][coordination] Remove unused class TaskManagerCliOptions
git bisect good c9c8a29b1b2e4f2886fba1524432f9788b564e61
# bad: [ae539c97c858b94e0e2504b54a8517ac1383482a] [hotfix][runtime] Check managed memory fraction range when setting it into StreamConfig
git bisect bad ae539c97c858b94e0e2504b54a8517ac1383482a
# good: [01d6972ab267807b8afccb09a45c454fa76d6c4b] [hotfix] Refactor out slots creation from the TaskSlotTable constructor
git bisect good 01d6972ab267807b8afccb09a45c454fa76d6c4b
# bad: [d32e1d00854e24bc4bb3aad6d866c2d709acd993] [FLINK-14594][core] Change Resource to use BigDecimal as its value
git bisect bad d32e1d00854e24bc4bb3aad6d866c2d709acd993
# bad: [25f87ec208a642283e995811d809632129ca289a] [FLINK-11935][table-planner] Fix cast timestamp/date to string to avoid Gregorian cutover
git bisect bad 25f87ec208a642283e995811d809632129ca289a
# bad: [21c6b85a6f5991aabcbcd41fedc860d662d478fb] [FLINK-14842][table] add logging for loaded modules and functions
git bisect bad 21c6b85a6f5991aabcbcd41fedc860d662d478fb
# bad: [48986aa0b89de731d1b9136b59d409933cc15408] [hotfix] Remove unnecessary comments about memory size calculation before network init
git bisect bad 48986aa0b89de731d1b9136b59d409933cc15408
# bad: [4c4652efa43ed8ab456f5f63c89b57d8c4a621f8] [hotfix] Remove unused number of slots in MemoryManager
git bisect bad 4c4652efa43ed8ab456f5f63c89b57d8c4a621f8
# bad: [9fed0ddc5bc015f98246a2d8d9adbe5fb2b91ba4] [FLINK-14400] Shrink the scope of MemoryManager from TaskExecutor to slot
git bisect bad 9fed0ddc5bc015f98246a2d8d9adbe5fb2b91ba4
# first bad commit: [9fed0ddc5bc015f98246a2d8d9adbe5fb2b91ba4] [FLINK-14400] Shrink the scope of MemoryManager from TaskExecutor to slot

Issue Links

• causes: FLINK-14834 Kerberized YARN on Docker test fails on Travis