[Sheepdog] [PATCH] sheep: modify cached_epoch

[yaohaiting.wujue at gmail.com]

From: HaiTing Yao <wujue.yht at taobao.com>

cached_epoch is a __thread variable. If it greater than 1, format the
cluster again will lead to permanent I/O error.

Signed-off-by: HaiTing Yao <wujue.yht at taobao.com>
---
 sheep/sdnet.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/sheep/sdnet.c b/sheep/sdnet.c
index 5db9f29..d693858 100644
--- a/sheep/sdnet.c
+++ b/sheep/sdnet.c
@@ -832,7 +832,11 @@ int get_sheep_fd(uint8_t *addr, uint16_t port, int node_idx, uint32_t epoch)
 	if (before(epoch, cached_epoch)) {
 		eprintf("requested epoch is smaller than the previous one: %d < %d\n",
 			epoch, cached_epoch);
-		return -1;
+		/* cluster format again */
+		if (sys->epoch == 1)
+			cached_epoch = 0;
+		else
+			return -1;
 	}
 	if (after(epoch, cached_epoch)) {
 		for (i = 0; i < SD_MAX_NODES; i++) {
-- 
1.7.1