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author | Josh Rosen <joshrosen@databricks.com> | 2016-09-15 11:54:17 -0700 |
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committer | Josh Rosen <joshrosen@databricks.com> | 2016-09-15 11:54:17 -0700 |
commit | 1202075c95eabba0ffebc170077df798f271a139 (patch) | |
tree | 6eb8e585de949f3a257f924e479af6563cb730cb /python | |
parent | a6b8182006d0c3dda67c06861067ca78383ecf1b (diff) | |
download | spark-1202075c95eabba0ffebc170077df798f271a139.tar.gz spark-1202075c95eabba0ffebc170077df798f271a139.tar.bz2 spark-1202075c95eabba0ffebc170077df798f271a139.zip |
[SPARK-17484] Prevent invalid block locations from being reported after put() exceptions
## What changes were proposed in this pull request?
If a BlockManager `put()` call failed after the BlockManagerMaster was notified of a block's availability then incomplete cleanup logic in a `finally` block would never send a second block status method to inform the master of the block's unavailability. This, in turn, leads to fetch failures and used to be capable of causing complete job failures before #15037 was fixed.
This patch addresses this issue via multiple small changes:
- The `finally` block now calls `removeBlockInternal` when cleaning up from a failed `put()`; in addition to removing the `BlockInfo` entry (which was _all_ that the old cleanup logic did), this code (redundantly) tries to remove the block from the memory and disk stores (as an added layer of defense against bugs lower down in the stack) and optionally notifies the master of block removal (which now happens during exception-triggered cleanup).
- When a BlockManager receives a request for a block that it does not have it will now notify the master to update its block locations. This ensures that bad metadata pointing to non-existent blocks will eventually be fixed. Note that I could have implemented this logic in the block manager client (rather than in the remote server), but that would introduce the problem of distinguishing between transient and permanent failures; on the server, however, we know definitively that the block isn't present.
- Catch `NonFatal` instead of `Exception` to avoid swallowing `InterruptedException`s thrown from synchronous block replication calls.
This patch depends upon the refactorings in #15036, so that other patch will also have to be backported when backporting this fix.
For more background on this issue, including example logs from a real production failure, see [SPARK-17484](https://issues.apache.org/jira/browse/SPARK-17484).
## How was this patch tested?
Two new regression tests in BlockManagerSuite.
Author: Josh Rosen <joshrosen@databricks.com>
Closes #15085 from JoshRosen/SPARK-17484.
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