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HADOOP-12853. Change WASB documentation regarding page blob support. Contributed by Madhumita Chakraborty. 

(cherry picked from commit f98dff329b)
This commit is contained in:
Chris Nauroth 2016-03-01 13:18:42 -08:00
parent 023c2d2e56
commit bce33b5179
2 changed files with 6 additions and 3 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -567,6 +567,9 @@ Release 2.8.0 - UNRELEASED
HADOOP-10865. Add a Crc32 chunked verification benchmark for both directly HADOOP-10865. Add a Crc32 chunked verification benchmark for both directly
and non-directly buffer cases. (szetszwo) and non-directly buffer cases. (szetszwo)
HADOOP-12853. Change WASB documentation regarding page blob support.
(Madhumita Chakraborty via cnauroth)
BUG FIXES BUG FIXES
HADOOP-12617. SPNEGO authentication request to non-default realm gets HADOOP-12617. SPNEGO authentication request to non-default realm gets

6
hadoop-tools/hadoop-azure/src/site/markdown/index.md
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@ -40,8 +40,8 @@ on the additional artifacts it requires, notably the
* Present a hierarchical file system view by implementing the standard Hadoop * Present a hierarchical file system view by implementing the standard Hadoop
[`FileSystem`](../api/org/apache/hadoop/fs/FileSystem.html) interface. [`FileSystem`](../api/org/apache/hadoop/fs/FileSystem.html) interface.
* Supports configuration of multiple Azure Blob Storage accounts. * Supports configuration of multiple Azure Blob Storage accounts.
* Supports both page blobs (suitable for most use cases, such as MapReduce) and * Supports both block blobs (suitable for most use cases, such as MapReduce) and
block blobs (suitable for continuous write use cases, such as an HBase page blobs (suitable for continuous write use cases, such as an HBase
write-ahead log). write-ahead log).
* Reference file system paths using URLs using the `wasb` scheme. * Reference file system paths using URLs using the `wasb` scheme.
* Also reference file system paths using URLs with the `wasbs` scheme for SSL * Also reference file system paths using URLs with the `wasbs` scheme for SSL
@ -168,9 +168,9 @@ can be written any number of times, whereas block blobs can only be appended to
work for HBase logs, so page blob support was introduced to overcome this work for HBase logs, so page blob support was introduced to overcome this
limitation. limitation.
Page blobs can be used for other purposes beyond just HBase log files though.
Page blobs can be up to 1TB in size, larger than the maximum 200GB size for block Page blobs can be up to 1TB in size, larger than the maximum 200GB size for block
blobs. blobs.
You should stick to block blobs for most usage, and page blobs are only tested in context of HBase write-ahead logs.
In order to have the files you create be page blobs, you must set the In order to have the files you create be page blobs, you must set the
configuration variable `fs.azure.page.blob.dir` to a comma-separated list of configuration variable `fs.azure.page.blob.dir` to a comma-separated list of