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https://issues.apache.org/jira/browse/HDDS-1530?focusedWorklogId=245954&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-245954
]
ASF GitHub Bot logged work on HDDS-1530:
----------------------------------------
Author: ASF GitHub Bot
Created on: 21/May/19 11:26
Start Date: 21/May/19 11:26
Worklog Time Spent: 10m
Work Description: iamcaoxudong commented on pull request #830: HDDS-1530.
Freon support big files larger than 2GB and add --bufferSize and
--validateWrites options.
URL: https://github.com/apache/hadoop/pull/830#discussion_r285967860
##########
File path:
hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/RandomKeyGenerator.java
##########
@@ -622,7 +642,11 @@ public void run() {
try (Scope writeScope = GlobalTracer.get()
.buildSpan("writeKeyData")
.startActive(true)) {
- os.write(keyValue);
+ for (long nrRemaining = keySize - randomValue.length;
+ nrRemaining > 0; nrRemaining -= bufferSize) {
+ int curSize = (int)Math.min(bufferSize, nrRemaining);
+ os.write(keyValueBuffer, 0, curSize);
Review comment:
Thank you, but I have some different opinions:
1. On the client machine, the buffer here will be sent to the Ratis DataNode
via TCP later, so the file system buffer/cache is not involved.
2. On the DataNode, the file system cache is managed by the file's Inode
index. since each key is written on DataNode through different files, so I
think it will not affected by file system buffer/cache too significant.
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Issue Time Tracking
-------------------
Worklog Id: (was: 245954)
Time Spent: 2h 20m (was: 2h 10m)
> Ozone: Freon: Support big files larger than 2GB and add "--bufferSize" and
> "--validateWrites" options.
> ------------------------------------------------------------------------------------------------------
>
> Key: HDDS-1530
> URL: https://issues.apache.org/jira/browse/HDDS-1530
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: test
> Reporter: Xudong Cao
> Assignee: Xudong Cao
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> *Current problems:*
> 1. Freon does not support big files larger than 2GB because it use an int
> type "keySize" parameter and also "keyValue" buffer size.
> 2. Freon allocates a entire buffer for each key at once, so if the key size
> is large and the concurrency is high, freon will report OOM exception
> frequently.
> 3. Freon lacks option such as "--validateWrites", thus users cannot manually
> specify that verification is required after writing.
> *Some solutions:*
> 1. Use a long type "keySize" parameter, make sure freon can support big
> files larger than 2GB.
> 2. Use a small buffer repeatedly than allocating the entire key-size buffer
> at once, the default buffer size is 4K and can be configured by "–bufferSize"
> parameter.
> 3. Add a "--validateWrites" option to Freon command line, users can provide
> this option to indicate that a validation is required after write.
>
>
>
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