From 91904ee50218def61e54362ef38aaf696d067a9a Mon Sep 17 00:00:00 2001
From: Jeff Tao <jhtao@taosdata.com>
Date: Fri, 14 Aug 2020 02:41:44 +0000
Subject: [PATCH] inotfiy events

---
 src/sync/src/syncMain.c     |  6 +++---
 src/sync/src/syncRetrieve.c | 23 ++++++++++++++++-------
 2 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/src/sync/src/syncMain.c b/src/sync/src/syncMain.c
index f2abded3b6..eaa073348a 100644
--- a/src/sync/src/syncMain.c
+++ b/src/sync/src/syncMain.c
@@ -32,7 +32,7 @@
 // global configurable
 int       tsMaxSyncNum = 2;
 int       tsSyncTcpThreads = 2;
-int       tsMaxWatchFiles = 100;
+int       tsMaxWatchFiles = 500;
 int       tsMaxFwdInfo = 200;
 int       tsSyncTimer = 1;
 //int       sDebugFlag = 135;
@@ -516,7 +516,7 @@ static SSyncPeer *syncAddPeer(SSyncNode *pNode, const SNodeInfo *pInfo)
   int ret = strcmp(pPeer->fqdn, tsNodeFqdn);
   if (pPeer->nodeId == 0 || (ret > 0) || (ret == 0 && pPeer->port > tsSyncPort)) {
     sDebug("%s, start to check peer connection", pPeer->id);
-    taosTmrReset(syncCheckPeerConnection, 100, pPeer, syncTmrCtrl, &pPeer->timer);
+    taosTmrReset(syncCheckPeerConnection, 100 + (pNode->vgId*10)%100, pPeer, syncTmrCtrl, &pPeer->timer);
   }
   
   syncAddNodeRef(pNode);
@@ -815,7 +815,7 @@ static void syncRecoverFromMaster(SSyncPeer *pPeer)
   taosTmrStopA(&pPeer->timer);
   if (tsSyncNum >= tsMaxSyncNum) {
     sInfo("%s, %d syncs are in process, try later", pPeer->id, tsSyncNum);
-    taosTmrReset(syncTryRecoverFromMaster, 500, pPeer, syncTmrCtrl, &pPeer->timer);
+    taosTmrReset(syncTryRecoverFromMaster, 500 + (pNode->vgId*10)%200, pPeer, syncTmrCtrl, &pPeer->timer);
     return;
   }
 
diff --git a/src/sync/src/syncRetrieve.c b/src/sync/src/syncRetrieve.c
index f881b680f5..1dd1cda343 100644
--- a/src/sync/src/syncRetrieve.c
+++ b/src/sync/src/syncRetrieve.c
@@ -57,13 +57,14 @@ static int syncAddIntoWatchList(SSyncPeer *pPeer, char *name)
     }
   }
 
-  *wd = inotify_add_watch(pPeer->notifyFd, name, IN_MODIFY);
+  *wd = inotify_add_watch(pPeer->notifyFd, name, IN_MODIFY | IN_DELETE);
   if (*wd == -1) {
     sError("%s, failed to add %s(%s)", pPeer->id, name, strerror(errno));
     return -1;
+  } else {
+    sDebug("%s, monitor %s, wd:%d watchNum:%d", pPeer->id, name, *wd, pPeer->watchNum);
   }
 
-  pPeer->watchNum++;
   pPeer->watchNum = (pPeer->watchNum +1) % tsMaxWatchFiles;
 
   return 0;
@@ -75,16 +76,24 @@ static int syncAreFilesModified(SSyncPeer *pPeer)
 
   char buf[2048]; 
   int len = read(pPeer->notifyFd, buf, sizeof(buf));
-  if (len <0 && errno != EAGAIN) {
+  if (len < 0 && errno != EAGAIN) {
     sError("%s, failed to read notify FD(%s)", pPeer->id, strerror(errno));    
     return -1;
   }
     
   int code = 0; 
-  if (len >0) { 
-    sDebug("%s, processed file is changed", pPeer->id);    
-    pPeer->fileChanged = 1;
-    code = 1;
+  if (len > 0) { 
+    const struct inotify_event *event;
+    char *ptr;
+    for (ptr = buf; ptr < buf + len; ptr += sizeof(struct inotify_event) + event->len) {
+      event = (const struct inotify_event *) ptr; 
+      if ((event->mask & IN_MODIFY) || (event->mask & IN_DELETE)) { 
+        sDebug("%s, processed file is changed", pPeer->id);
+        pPeer->fileChanged = 1;
+        code = 1;
+        break;
+      }
+    }
   }
 
   return code;  
-- 
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