Tim Armstrong has uploaded a new patch set (#3). Change subject: IMPALA-3764: fuzz test HDFS scanners ......................................................................
IMPALA-3764: fuzz test HDFS scanners This adds a test that performs some simple fuzz testing of HDFS scanners. It creates a copy of a given HDFS table, with each file in the table corrupted in a random way: either a single byte is set to a random value, or the file is truncated to a random length. It then runs a query that scans the whole table with several different batch_size settings. I made some effort to make the failures reproducible by explicitly seeding the random number generator, and providing a mechanism to override the seed. The fuzzer has found crashes resulting from corrupted or truncated input files for RCFile, SequenceFile, Parquet, and Text LZO so far. Avro only had a small buffer read overrun detected by ASAN. Includes fixes for Parquet crashes found by the fuzzer and a small buffer overrun in Avro. Initially it is only enabled for Avro, Parquet, and uncompressed text. As follow-up work we should fix the bugs in the other scanners and enable the test for them. We also don't implement abort_on_error=0 correctly in Parquet: for some file formats, corrupt headers result in the query being aborted, so an exception will xfail the test. Testing: Ran the test with exploration_strategy=exhaustive in a loop locally with both DEBUG and ASAN builds. It's been running successfully for a few hours now without hitting any crashes or test failures after I made the fixes included in the patch. Also ran exhaustive private build and core ASAN build. Change-Id: I50cf43195a7c582caa02c85ae400ea2256fa3a3b --- M be/src/exec/base-sequence-scanner.cc M be/src/exec/hdfs-parquet-scanner.cc M be/src/exec/hdfs-parquet-scanner.h M be/src/runtime/disk-io-mgr.cc A be/src/runtime/scoped-buffer.h M be/src/util/bit-stream-utils.h M be/src/util/bit-stream-utils.inline.h M be/src/util/compress.cc M be/src/util/dict-encoding.h M be/src/util/dict-test.cc M be/src/util/rle-encoding.h M be/src/util/rle-test.cc M testdata/workloads/functional-query/queries/QueryTest/parquet.test M tests/common/impala_test_suite.py M tests/query_test/test_scanners.py 15 files changed, 384 insertions(+), 47 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala refs/changes/48/3448/3 -- To view, visit http://gerrit.cloudera.org:8080/3448 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: newpatchset Gerrit-Change-Id: I50cf43195a7c582caa02c85ae400ea2256fa3a3b Gerrit-PatchSet: 3 Gerrit-Project: Impala Gerrit-Branch: cdh5-trunk Gerrit-Owner: Tim Armstrong <tarmstr...@cloudera.com>