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Posted to commits@impala.apache.org by tm...@apache.org on 2018/05/29 19:14:09 UTC
[06/15] impala git commit: [DOCS] Fixed misleading documentation on
Impala + HDFS caching
[DOCS] Fixed misleading documentation on Impala + HDFS caching
Change-Id: I63cd1ff7b885a094a4a3e91c31101d25414b4db7
Reviewed-on: http://gerrit.cloudera.org:8080/10454
Reviewed-by: Tim Armstrong <ta...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>
Project: http://git-wip-us.apache.org/repos/asf/impala/repo
Commit: http://git-wip-us.apache.org/repos/asf/impala/commit/fd27b170
Tree: http://git-wip-us.apache.org/repos/asf/impala/tree/fd27b170
Diff: http://git-wip-us.apache.org/repos/asf/impala/diff/fd27b170
Branch: refs/heads/2.x
Commit: fd27b1708f8605e8c91396c8f6e4a657dd1b218c
Parents: 86c61bc
Author: Alex Rodoni <ar...@cloudera.com>
Authored: Fri May 18 14:32:02 2018 -0700
Committer: Impala Public Jenkins <im...@gerrit.cloudera.org>
Committed: Fri May 25 23:17:16 2018 +0000
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docs/topics/impala_perf_hdfs_caching.xml | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
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http://git-wip-us.apache.org/repos/asf/impala/blob/fd27b170/docs/topics/impala_perf_hdfs_caching.xml
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diff --git a/docs/topics/impala_perf_hdfs_caching.xml b/docs/topics/impala_perf_hdfs_caching.xml
index e1f25a6..8f0fbb9 100644
--- a/docs/topics/impala_perf_hdfs_caching.xml
+++ b/docs/topics/impala_perf_hdfs_caching.xml
@@ -270,14 +270,11 @@ show table stats census;
location, dropping the table, and so on.
</p>
- <p>
- When data is requested to be pinned in memory, that process happens in the background without blocking
- access to the data while the caching is in progress. Loading the data from disk could take some time.
- Impala reads each HDFS data block from memory if it has been pinned already, or from disk if it has not
- been pinned yet. When files are added to a table or partition whose contents are cached, Impala
- automatically detects those changes and performs a <codeph>REFRESH</codeph> automatically once the relevant
- data is cached.
- </p>
+ <p> When data is requested to be pinned in memory, that process happens in
+ the background without blocking access to the data while the caching is
+ in progress. Loading the data from disk could take some time. Impala
+ reads each HDFS data block from memory if it has been pinned already, or
+ from disk if it has not been pinned yet.</p>
<p>
The amount of data that you can pin on each node through the HDFS caching mechanism is subject to a quota