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App Engine Python SDK
v1.6.9 rev.445
The Python runtime is available as an experimental Preview feature.
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Default configs. Do not change parameters whose names begin with _. SHARD_MAX_ATTEMPTS: Max attempts to execute a shard before giving up. TASK_MAX_ATTEMPTS: Max attempts to execute a task before dropping it. Task is any taskqueue task created by MR framework. A task is dropped when its X-AppEngine-TaskExecutionCount is bigger than this number. Dropping a task will cause abort on the entire MR job. TASK_MAX_DATA_PROCESSING_ATTEMPTS: Max times to execute a task when previous task attempts failed during data processing stage. An MR work task has three major stages: initial setup, data processing, and final checkpoint. Setup stage should be allowed to be retried more times than data processing stage: setup failures are caused by unavailable GAE services while data processing failures are mostly due to user function error out on certain input data. Thus, set TASK_MAX_ATTEMPTS higher than this parameter. QUEUE_NAME: Default queue for MR. SHARD_COUNT: Default shard count. PROCESSING_RATE_PER_SEC: Default rate of processed entities per second. BASE_PATH : Base path of mapreduce and pipeline handlers.