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HDFS-4739. NN can miscalculate the number of extra edit log segments to retain. Contributed by Aaron T. Myers. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1471773 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2013-04-24 23:32:13 +00:00
parent 1efa9d84ab
commit a0e8dbbb19
2 changed files with 11 additions and 4 deletions
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8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NNStorageRetentionManager.java
View File

@ -118,11 +118,17 @@ public int compare(EditLogInputStream a, EditLogInputStream b) {
.result();
}
});
// Remove from consideration any edit logs that are in fact required.
while (editLogs.size() > 0 &&
editLogs.get(editLogs.size() - 1).getFirstTxId() >= minimumRequiredTxId) {
editLogs.remove(editLogs.size() - 1);
}
// Next, adjust the number of transactions to retain if doing so would mean
// keeping too many segments around.
while (editLogs.size() > maxExtraEditsSegmentsToRetain) {
purgeLogsFrom = editLogs.get(0).getFirstTxId();
purgeLogsFrom = editLogs.get(0).getLastTxId() + 1;
editLogs.remove(0);
}

7
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNNStorageRetentionManager.java
View File

@ -217,11 +217,12 @@ public void testRetainExtraLogsLimitedSegments() throws IOException {
tc.addLog("/foo2/current/" + getFinalizedEditsFileName(176, 200), true);
tc.addLog("/foo2/current/" + getFinalizedEditsFileName(201, 225), true);
tc.addLog("/foo2/current/" + getFinalizedEditsFileName(226, 240), true);
// Only retain 2 extra segments. The 301-400 segment is considered required,
// not extra.
// Only retain 2 extra segments. The 301-350 and 351-400 segments are
// considered required, not extra.
tc.addLog("/foo2/current/" + getFinalizedEditsFileName(241, 275), false);
tc.addLog("/foo2/current/" + getFinalizedEditsFileName(276, 300), false);
tc.addLog("/foo2/current/" + getFinalizedEditsFileName(301, 400), false);
tc.addLog("/foo2/current/" + getFinalizedEditsFileName(301, 350), false);
tc.addLog("/foo2/current/" + getFinalizedEditsFileName(351, 400), false);
tc.addLog("/foo2/current/" + getInProgressEditsFileName(401), false);
runTest(tc);
}