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https://issues.apache.org/jira/browse/HADOOP-19645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18011402#comment-18011402
]
ASF GitHub Bot commented on HADOOP-19645:
-----------------------------------------
anmolanmol1234 commented on code in PR #7837:
URL: https://github.com/apache/hadoop/pull/7837#discussion_r2247501549
##########
hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/services/TestAbfsInputStream.java:
##########
@@ -781,6 +794,132 @@ public void testDefaultReadaheadQueueDepth() throws
Exception {
in.close();
}
+ @Test
+ public void testReadTypeInTracingContextHeader() throws Exception {
+ AzureBlobFileSystem spiedFs = Mockito.spy(getFileSystem());
+ AzureBlobFileSystemStore spiedStore = Mockito.spy(spiedFs.getAbfsStore());
+ AbfsConfiguration spiedConfig =
Mockito.spy(spiedStore.getAbfsConfiguration());
+ AbfsClient spiedClient = Mockito.spy(spiedStore.getClient());
+ Mockito.doReturn(ONE_MB).when(spiedConfig).getReadBufferSize();
+ Mockito.doReturn(ONE_MB).when(spiedConfig).getReadAheadBlockSize();
+ Mockito.doReturn(spiedClient).when(spiedStore).getClient();
+ Mockito.doReturn(spiedStore).when(spiedFs).getAbfsStore();
+ Mockito.doReturn(spiedConfig).when(spiedStore).getAbfsConfiguration();
+ int numOfReadCalls = 0;
+ int fileSize = 0;
+
+ /*
+ * Test to verify Normal Read Type.
+ * Disabling read ahead ensures that read type is normal read.
+ */
+ fileSize = 3 * ONE_MB; // To make sure multiple blocks are read.
+ numOfReadCalls += 3; // 3 blocks of 1MB each.
+ doReturn(false).when(spiedConfig).isReadAheadV2Enabled();
+ doReturn(false).when(spiedConfig).isReadAheadEnabled();
+ testReadTypeInTracingContextHeaderInternal(spiedFs, fileSize, NORMAL_READ,
numOfReadCalls);
+
+ /*
+ * Test to verify Missed Cache Read Type.
+ * Setting read ahead depth to 0 ensure that nothing can be got from
prefetch.
+ * In such a case Input Stream will do a sequential read with missed cache
read type.
+ */
+ fileSize = ONE_MB; // To make sure only one block is read.
+ numOfReadCalls += 1; // 1 block of 1MB.
+ Mockito.doReturn(0).when(spiedConfig).getReadAheadQueueDepth();
+ doReturn(true).when(spiedConfig).isReadAheadEnabled();
+ testReadTypeInTracingContextHeaderInternal(spiedFs, fileSize,
MISSEDCACHE_READ, numOfReadCalls);
+
+ /*
+ * Test to verify Prefetch Read Type.
+ * Setting read ahead depth to 2 with prefetch enabled ensures that
prefetch is done.
+ * First read here might be Normal or Missed Cache but the rest 2 should
be Prefetched Read.
+ */
+ fileSize = 3 * ONE_MB; // To make sure multiple blocks are read.
+ numOfReadCalls += 3;
+ doReturn(true).when(spiedConfig).isReadAheadEnabled();
+ Mockito.doReturn(3).when(spiedConfig).getReadAheadQueueDepth();
+ testReadTypeInTracingContextHeaderInternal(spiedFs, fileSize,
PREFETCH_READ, numOfReadCalls);
+
+ /*
+ * Test to verify Footer Read Type.
+ * Having file size less than footer read size and disabling small file opt
+ */
+ fileSize = 8 * ONE_KB;
+ numOfReadCalls += 1; // Full file will be read along with footer.
+ doReturn(false).when(spiedConfig).readSmallFilesCompletely();
+ doReturn(true).when(spiedConfig).optimizeFooterRead();
+ testReadTypeInTracingContextHeaderInternal(spiedFs, fileSize, FOOTER_READ,
numOfReadCalls);
+
+ /*
+ * Test to verify Small File Read Type.
+ * Having file size less than footer read size and disabling small file opt
+ */
+ fileSize = 8 * ONE_KB;
+ numOfReadCalls += 1; // Full file will be read along with footer.
+ doReturn(true).when(spiedConfig).readSmallFilesCompletely();
+ doReturn(false).when(spiedConfig).optimizeFooterRead();
+ testReadTypeInTracingContextHeaderInternal(spiedFs, fileSize,
SMALLFILE_READ, numOfReadCalls);
+ }
Review Comment:
One test for direct read as well ?
> ABFS: [ReadAheadV2] Improve Metrics for Read Calls to identify type of read
> done.
> ---------------------------------------------------------------------------------
>
> Key: HADOOP-19645
> URL: https://issues.apache.org/jira/browse/HADOOP-19645
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Affects Versions: 3.3.6, 3.4.1
> Reporter: Anuj Modi
> Assignee: Anuj Modi
> Priority: Major
> Labels: pull-request-available
>
> There are a number of ways in which ABFS driver can trigger a network call to
> read data. We need a way to identify what type of read call was made from
> client. Plan is to add an indication for this in already present
> ClientRequestId header.
> Following are types of read we want to identify:
> # Direct Read: Read from a given position in remote file. This will be
> synchronous read
> # Normal Read: Read from current seeked position where read ahead was
> bypassed. This will be synchronous read.
> # Prefetch Read: Read triggered from background threads filling up in memory
> cache. This will be asynchronous read.
> # Missed Cache Read: Read triggered after nothing was received from read
> ahead. This will be synchronous read.
> # Footer Read: Read triggered as part of footer read optimization. This will
> be synchronous.
> # Small File Read: Read triggered as a part of small file read. This will be
> synchronous read.
> We will add another field in the Tracing Header (Client Request Id) for each
> request. We can call this field "Operation Specific Header" very similar to
> how we have "Retry Header" today. As part of this we will only use it for
> read operations keeping it empty for other operations. Moving ahead f we need
> to publish any operation specific info, same header can be used.
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