ivandika3 commented on code in PR #10946:
URL: https://github.com/apache/ozone/pull/10946#discussion_r3771945651
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hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/block/BlockManagerImpl.java:
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@@ -171,28 +172,48 @@ public AllocatedBlock allocateBlock(final long size,
// configured, it will be of type StorageType.DISK and therefore belong
// to a StorageTier.DISK tier, so for old clients the write process is
// unchanged if the Datanode Volume configuration is not changed.
- StorageTier storageTier = StorageTier.getDefaultTier();
- ContainerInfo containerInfo = writableContainerFactory.getContainer(
- size, replicationConfig, owner, excludeList, storageTier);
+ boolean isFallBack = false;
+ ContainerInfo containerInfo = null;
+ try {
+ containerInfo = writableContainerFactory.getContainer(
+ size, replicationConfig, owner, excludeList,
storagePolicy.getCreationTier());
+ } catch (IOException e) {
+ if (allowFallbackStoragePolicy &&
storagePolicy.getCreationFallbackTier() != StorageTier.EMPTY) {
+ // TODO StoragePolicy should It should be distinguished in detail
which exceptions can try to fallback
+ isFallBack = true;
+ containerInfo = writableContainerFactory.getContainer(size,
replicationConfig, owner,
+ excludeList, storagePolicy.getCreationFallbackTier());
+ } else {
+ throw e;
+ }
Review Comment:
Should we throw the exception here? Internally, we don't throw exception
here.
I just reviewed BlockManagerImpl#allocateBlock logic. It seems currently we
will allow letting the `allocateBlock` to return null, but we simply skip this
block. Meaning if client asks for 2 blocks, but only 1 is provided, then we
will return only 1 block instead of failing the whole request. Is this expected
behavior? We should clarify this logic, this is important.
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