Meta server: normalize fsck parameter names. Keep old parameter names…

… for backward compatibility.

Annotated configuration files: document meta server fack parameters.

conf/MetaServer.prp

@@ -1352,6 +1352,24 @@ chunkServer.msgLogWriter.logLevel = NOTICE
 # Read RPC request size limit.
 # metaServer.dataStore.maxReadSize = 2097152
 
+# ======================= FSCK =================================================
+
+# Maximum number of files to include in FSCK report.
+# Default is 128K
+# metaServer.maxFsckFiles = 131072
+
+# Maximum FSCK run time.
+# FSCK stopped if / when  run time exceeds the maximum and partial report
+# produces..
+# Default is 1140 seconds (19 minutes)
+# metaServer.maxFsckTime = 1140
+
+# Abandoned file timeout.
+# Files with 0 logical size and 1 or more blocks are reported by FSCK if / when
+# modification time plus timeout is less than the FSCK start time.
+# Default is 1000 seconds.
+# metaServer.fsckAbandonedFileTimeout = 1000
+
 # ==================== Meta Server Viewstamped Replication (VR) ================
 
 # Configuring replicated meta server group / cluster consists of the following

src/cc/meta/LayoutManager.cc

@@ -2368,14 +2368,21 @@ LayoutManager::SetParameters(const Properties& props, int clientPort)
         "metaServer.sortCandidatesByLoadAvg",
         mSortCandidatesByLoadAvgFlag ? 1 : 0) != 0;
 
+    // The following two parameter names are for backward compatibility.
     mMaxFsckFiles = props.getValue(
         "metaServer.maxFsckChunks",
         mMaxFsckFiles);
+    mMaxFsckTime = (int64_t)(props.getValue(
+        "metaServer.mMaxFsckTime",
+        mMaxFsckTime * 1e-6) * 1e6);
+    mMaxFsckFiles = props.getValue(
+        "metaServer.maxFsckFiles",
+        mMaxFsckFiles);
     mFsckAbandonedFileTimeout = (int64_t)(props.getValue(
         "metaServer.fsckAbandonedFileTimeout",
         mFsckAbandonedFileTimeout * 1e-6) * 1e6);
     mMaxFsckTime = (int64_t)(props.getValue(
-        "metaServer.mMaxFsckTime",
+        "metaServer.maxFsckTime",
         mMaxFsckTime * 1e-6) * 1e6);
     mFullFsckFlag = props.getValue(
         "metaServer.fullFsck",