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https://issues.apache.org/jira/browse/IMPALA-10598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vihang Karajgaonkar resolved IMPALA-10598.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> test_cache_reload_validation is flaky
> -------------------------------------
>
> Key: IMPALA-10598
> URL: https://issues.apache.org/jira/browse/IMPALA-10598
> Project: IMPALA
> Issue Type: Test
> Reporter: Vihang Karajgaonkar
> Assignee: Vihang Karajgaonkar
> Priority: Minor
> Labels: flaky-test
> Fix For: Impala 4.0
>
>
> I noticed that when I run
> {noformat}
> bin/impala-py.test tests/query_test/test_hdfs_caching.py -k
> test_cache_reload_validation
> {noformat}
> I see a the following failure on master branch.
> {noformat}
> TestHdfsCachingDdl.test_cache_reload_validation[protocol: beeswax |
> exec_option: {'batch_size': 0, 'num_nodes': 0,
> 'disable_codegen_rows_threshold': 5000, 'disable_codegen': False,
> 'abort_on_error': 1, 'exec_single_node_rows_threshold': 0} | table_format:
> text/none]
> tests/query_test/test_hdfs_caching.py:269: in test_cache_reload_validation
> assert num_entries_pre + 4 == get_num_cache_requests(), \
> E AssertionError: Adding the tables should be reflected by the number of
> cache directives.
> E assert (2 + 4) == 7
> E + where 7 = get_num_cache_requests()
> {noformat}
> This failure is reproducible for me every time but I am not sure why the
> jenkins job don't show this test failure. When I looked into this I found
> that the test depends on the method
> get the number of cache directives on the hdfs.
> {noformat}
> def get_num_cache_requests_util():
> rc, stdout, stderr = exec_process("hdfs cacheadmin -listDirectives
> -stats")
> assert rc == 0, 'Error executing hdfs cacheadmin: %s %s' % (stdout,
> stderr)
> return len(stdout.split('\n'))
> {noformat}
> This output of this command when there are no entries is
> {noformat}
> Found 0 entries
> {noformat}
> when there are entries the output looks like
> {noformat}
> Found 4 entries
> ID POOL REPL EXPIRY PATH
> BYTES_NEEDED BYTES_CACHED FILES_NEEDED FILES_CACHED
> 225 testPool 8 never /test-warehouse/cachedb.db/cached_tbl_reload
> 0 0 0 0
> 226 testPool 8 never
> /test-warehouse/cachedb.db/cached_tbl_reload_part 0
> 0 0 0
> 227 testPool 8 never
> /test-warehouse/cachedb.db/cached_tbl_reload_part/j=1 0
> 0 0 0
> 228 testPool 8 never
> /test-warehouse/cachedb.db/cached_tbl_reload_part/j=2 0
> 0 0 0
> {noformat}
> When there are no entries there is also a additional new line which is
> counted.
> So when there are no entries the method outputs 2 and when there are 4
> entries the method outputs 7 which causes the failure because the test
> expects 2+4.
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