Ahmed Hussein created TEZ-4103:
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Summary: Progress in DAG, Vertex, and tasks is incorrect
Key: TEZ-4103
URL: https://issues.apache.org/jira/browse/TEZ-4103
Project: Apache Tez
Issue Type: Bug
Reporter: Ahmed Hussein
Assignee: Ahmed Hussein
Looking at the progress code, there some few issues that could lead to some
problems calculating the progress.
There are some cases when the progress never reach 1.0.
This is a list of issues that need to be fixed in the progress code:
* After TEZ-3982, since values are skipped in the In some cases, the progress
of DAG or a vertex may never reach 1.0f. this is in both "{{DAGImpl.java}}" and
"{{ProgressHelper.java}}"
* {{ProgressHelper}} schedules a service to update the progress, dubbed
`{{ProgressHelper.monitorProgress}}`. According to Java Documentation:
{quote}If any execution of the task encounters an exception,
subsequent executions are suppressed.
Otherwise, the task will only terminate via cancellation
or termination of the executor.
{quote}
In other words, if the service dies, there is no way to catch that in the code
and the progress will never be updated.
* The `{{SimpleProcessor.inputMap}}` is not thread-safe. They are initialized
as `{{LinkedHashMap}}` and there is no synchronization on the field objects in
the map. This could be problematic in concurrent context.
* `{{VertexImpl.getProgress()}}` does not check the range of the progress
calculated in `{{VertexImpl.computeProgress()}}`
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