[GitHub] [accumulo] dlmarion commented on a diff in pull request #3076: Call FSDataOutputStream.setDropBehind for WAL files

[GitBox <gi...@apache.org>]

dlmarion commented on code in PR #3076:
URL: https://github.com/apache/accumulo/pull/3076#discussion_r1021932231


##########
server/tserver/src/main/java/org/apache/accumulo/tserver/log/DfsLogger.java:
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@@ -417,6 +417,13 @@ public synchronized void open(String address) throws IOException {
       else
         logFile = fs.create(logfilePath, true, 0, replication, blockSize);
 
+      // Tell the DataNode that the write ahead log does not need to be cached in the OS page cache
+      try {
+        logFile.setDropBehind(Boolean.TRUE);

Review Comment:
   Javadoc says that if parameter is null, then it defaults to configuration, which should be the value of `dfs.datanode.drop.cache.behind.writes`



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